Diablo Canyon Nuclear Power Plant: The WikiBook/Fukushima Daiichi nuclear disaster

At 07:30 JST, TEPCO prepared to release radioactive steam, indicating that "the amount of radiation to be released would be small and not of a level that would affect human health"http://www.reuters.com/article/2011/03/12/us-japan-quake-tepco-radiation-idUSTRE72B3PJ20110312 Reuters Japan's TEPCO preparing to release radiation from second reactor 12 March 2011 12 March 2011 Takenaka, Kiyoshi and manual venting took place at 08:41 and 09:20.http://www.world-nuclear-news.org/RS_Venting_at_Fukushima_Daiichi_3_1303111.html Efforts to manage Fukushima Daiichi 3, update 2 World Nuclear News 13 March 2011 13 March 2011 At 09:25 JST on 13 March, operators began injecting water containing boric acid into the primary containment vessel (PCV) via the pump of a fire truck.http://www.tepco.co.jp/en/press/corp-com/release/11031308-e.html TEPCO press release 8 Tepco 13 March 2011http://www.nisa.meti.go.jp/english/files/en20110314-1.pdf Seismic damage information (the 22nd release) 14 March 2011 Nuclear and Industrial Safety Agency 12 April 2011 When water levels continued to fall and pressure to rise, the injected water was switched to seawater at 13:12. By 15:00 it was noted that despite adding water the level in the reactor did not rise and radiation had increased.http://www.tepco.co.jp/en/press/corp-com/release/11031310-e.html Tepco 13 March 2011 press release 10 A rise was eventually recorded but the level stuck at 2 m below the top of reactor core. Other readings suggested that this could not be the case and the gauge was malfunctioning. Injection of seawater into the primary containment vessel (PCV) was discontinued at 01:10 on 14 March because all the water in the reserve pool had been used up. Supplies were restored by 03:20 and injection of water resumed. On the morning of 15 March, Secretary Edano announced that according to TEPCO, at one location near reactor units 3 and 4, radiation at an equivalent dose rate of 400 mSv/h was detected.http://www.jiji.com/jc/c?g=soc_30&k=2011031500479 放射線、福島原発で４００ミリシーベルト＝「人体に影響及ぼす可能性」－官房長官 Japanese jiji.com jiji press 15 March 2011 15 March 2011http://edition.cnn.com/2011/WORLD/asiapcf/03/14/japan.nuclear.reactors/index.html?hpt=T1 Radiation levels spike at Japanese nuclear plant CNN 15 March 2011 15 March 2011 This might have been due to debris from the explosion in unit 4. Explosion At 12:33 JST on 13 March, the chief spokesman of the Japanese government, Yukio Edano said hydrogen gas was building up inside the outer building of unit 3 just as had occurred in unit 1, threatening the same kind of explosion.http://www.ft.com/cms/s/0/7feb0aaa-4d3d-11e0-85e4-00144feab49a.html Japan battles to stop nuclear catastrophe Financial Times 13 March 2011 At 11:15 JST on 14 March, the envisaged explosion of the building surrounding reactor 3 of Fukushima 1 occurred, owing to the ignition of built up hydrogen gas.Urgent: Hydrogen blast occurs at Fukushima nuke plant's No. 3 reactor: agency http://english.kyodonews.jp/news/2011/03/77583.html Kyodo News Agency 14 March 2011http://www.msnbc.msn.com/id/42056237/ns/world_news-asiapacific/ 180,000 flee as Japan's nuclear crisis intensifies 13 March 2011 MSNBC The Nuclear and Industrial Safety Agency of Japan (NISA) reported, as with unit 1, the top section of the reactor building was blown apart, but the inner containment vessel was not breached. The explosion was larger than that in unit 1 and felt 40 kilometers away. Pressure readings within the reactor remained steady at around 380 kPa at 11:13 and 360 kPa at 11:55 compared to nominal levels of 400 kPa and a maximum recorded of 840 kPa. Water injection continued. Dose rates of 0.05 mSv/h were recorded in the service hall and of 0.02 mSv/h at the plant entrance. http://www.world-nuclear-news.org/RS_Explosion_rocks_third_Fukushima_reactor_1402111.html Second explosion rocks Fukushima Daiichi World-nuclear-news.org 15 March 2011 It was reported that day that eleven people were injured in the blast. http://www.nisa.meti.go.jp/english/files/en20110314-3.pdf 14 March 2011 An explosion caused by hydrogen at unit 3 of Fukushima Dai ichi NPS (3rd release) Nuclear and Industrial Safety Agency The Telegraph reported that six soldiers from the Japanese Central Nuclear Biological Chemical Weapon Defence Unit had been killed in the explosion. http://www.telegraph.co.uk/news/worldnews/asia/japan/8408863/Japan-tsunami-Fukushima-Fifty-the-first-interview.html 27 March 2011 Japan tsunami: Fukushima Fifty, the first interview The Telegraph (UK newspaper) London Andrew Gilligan Robert MendickMay 2011, but only injuries were reported in Japan. TEPCO and NISA announced that four TEPCO employees, three subcontractor employees, and four Self-Defence-Force soldiers were injured.http://www.nisa.meti.go.jp/english/files/en20110315-1.pdf News Release Nuclear and Industrial Safety Agency March 14, 2011 March 22, 2011http://www.news24.jp/articles/2011/03/14/06178266.html# 福島第一３号機爆発 自衛隊員ら１１人ケガ NNN News 24 March 14, 2011 May 22, 2011 Japanese American nuclear engineer Arnold Gundersen, noting the much greater power and vertical debris ejection compared to the unit 1 hydrogen blast, has theorized that the unit 3 explosion involved a prompt criticality in the spent fuel pool material, triggered by the mechanical disruption of an initial, smaller hydrogen gas explosion in the building. http://fairewinds.com/content/gundersen-postulates-unit-3-explosion-may-have-been-prompt-criticality-fuel-pool? 26 April 2011 Gundersen postulates Unit 3 explosion may have been prompt criticality in fuel pool Fairewinds Associates 27 April 2011 Spent fuel pool Around 10:00 JST on 16 March, NHK helicopters flying 30 km away videotaped white fumes rising from the Fukushima I facility. Officials suggested that the reactor 3 building was the most likely source, and said that its containment systems may have been breached."Japan says 2nd reactor may have ruptured with radioactive release", The New York Times 16 March 2010 The control room for reactors 3 and 4 was evacuated at 10:45 JST but staff were cleared to return and resume water injection into the reactor at 11:30 JST.http://www.nisa.meti.go.jp/english/files/en20110317-1.pdf Seismic damage information (the 26th release) 16 March 2011 Nuclear and Industrial Safety Agency 12 April 2011 At 16:12 JST, Self Defence Force (SDF) Chinook helicopters were preparing to pour water on unit 3, where white fumes rising from the building was believed to be water boiling away from the fuel rod cooling pond on the top floor of the reactor building, and on unit 4 where the cooling pool was also short of water. The mission was cancelled when helicopter measurements reported radiation levels of 50 mSv.9:51 am GMT 16 March 2011 http://www.telegraph.co.uk/news/worldnews/asia/japan/8385094/Helicopters-attempt-to-cool-Fukushima-nuclear-plant-from-the-air.html Video: Helicopters attempt to cool Fukushima nuclear plant from the air Telegraph 16 March 2011 18 March 2011 Londonhttp://www3.nhk.or.jp/daily/english/16_41.html NHK WORLD English .nhk.or.jp 18 March 2011 At 21:06 pm JST, the government reported that major damage to reactor 3 was unlikely but that it nonetheless remained their highest priority.http://af.reuters.com/article/energyOilNews/idAFTFD00670520110316 Major damage unlikely at Japan nuke plant's No.3 reactor – Kyodo | Energy & Oil | Reuters Af.reuters.com 9 February 2009 18 March 2011 Early on 17 March, TEPCO requested another attempt by the military to put water on the reactor using a helicopterhttp://af.reuters.com/article/energyOilNews/idAFLJE7ED00R20110316 Tokyo Elec: want military chopper to try again to douse reactor | Energy & Oil | Reuters Af.reuters.com 9 February 2009 18 March 2011 and four helicopter drops of seawater took place around 10:00 JST.Helicopter starts spraying water on Japan nuclear plant Reuters 17 March 2011 The riot police used a water cannon to spray water onto the top of the reactor building and then were replaced by members of the SDF with spray vehicles. On 18 March a crew of firemen took over the task with six fire engines each spraying 6 tons of water in 40 minutes. 30 further hyper rescue vehicles were involved in spraying operations.http://www.nisa.meti.go.jp/english/files/en20110318-3.pdf Seismic Damage Information (the 30th Release) 18 March 2011 Nuclear and Industrial Safety Agency 12 April 2011 Spraying continued each day to 23 March because of concerns the explosion in unit 3 may have damaged the pool (total 3,742 tonnes of water sprayed up to 22 March) with changing crews to minimise radiation exposure. Lighting in the control room was restored on 22 March after a connection was made to a new grid power supply and by 24 March it was possible to add 35 tonnes of seawater to the spent fuel pool using the cooling and purification system. Grey smoke was reported to be rising from the southeast corner of unit 3 on 21 March. The spent fuel pool is located at this part of the building. Workers were evacuated from the area. TEPCO claimed no significant change in radiation levels and the smoke subsided later the same day.http://www3.nhk.or.jp/daily/english/21_30.html Grey smoke from No.3 reactor subsided 21 March 2011 On 23 March, black smoke billowed from unit 3, prompting another evacuation of workers from the plant, though Tokyo Electric Power Co. officials said there had been no corresponding spike in radiation at the plant. "We don't know the reason for the smoke", Hidehiko Nishiyama of the Nuclear Safety Agency said.http://www.startribune.com/world/118421284.html Tokyo tap water tests higher for radiation; smoke prompts new evacuation of leaking nuke plant StarTribune.com 23 March 2011 29 March 2011 On 27 April, TEPCO revised its estimate of damaged fuel in unit 3 from 25% to 30%. Radiation measurements of the water in the unit 3 spent fuel pool were reported at 140 kBq of radioactive cesium-134 per cubic centimeter, 150 kBq of cesium-137 per cubic centimeter, and 11 kBq per cubic centimeter of iodine-131 on 10 May.Radiation high at No.3 reactor pool, NHK, 10 May 2011 Possibility of criticality in the spent fuel pool TEPCO claimed that there was a small but non-zero probability that the exposed fuel assemblies could reach criticality.Black, Richard http://www.bbc.co.uk/news/science-environment-12762608 Surprise 'critical' warning raises nuclear fears BBC 16 March 2011 26 March 2011Fukushima nuclear plant evacuated after radiation spikes The Guardian 16 March 2011 http://www.guardian.co.uk/world/2011/mar/16/fukushima-workers-evacuate-radiation-spikes The No 4 reactor is an increasing cause for concern. Tepco believes that the storage pool may be boiling, raising the possibility that exposed rods will reach criticality. "The possibility of re-criticality is not zero," a TEPCO spokesman said. McCurry, Justin London The BBC commented that criticality would never mean a nuclear explosion, but could cause a sustained release of radioactive materials. Criticality is usually considered highly unlikely, owing to the low enrichment level used in light water reactors.http://www.eurosafe-forum.org/userfiles/2_03_Eurosafe2010%206_Kilger%20(GRS).pdf Criticality Safety in the Waste Management of Spent Fuel from NPPs, Robert Kilger PDF 24 April 2011http://cat.inist.fr/?aModele=afficheN&cpsidt=1068367 Nondestructive assay of nuclear low-enriched uranium spent fuels for burnup credit application Cat.inist.fr 24 April 2011http://en.wikibooks.org/wiki/Radioactive_Waste_Management/Spent_Nuclear_Fuel Radioactive Waste Management/Spent Nuclear Fuel En.wikibooks.org 24 April 2011 There was, however, speculation on Russia Today by low-dose radiation researcher and anti-nuclear activist Christopher Busby that the explosion that destroyed the reactor 3 building was a "nuclear explosion" of some kind in the spent fuel pool.Busby: 'Can't seal Fukushima like Chernobyl - it all goes into sea' 25 April 2011 Russia Today http://www.youtube.com/watch?v=x-3Kf4JakWI (“I don’t think the end of Fukushima accident is in sight”) Similarly, as noted above, Arnie Gundersen surmised a prompt criticality for the 13 Mar 2011 explosion at the spent fuel pool located on top of the reactor 3 building. http://www.fairewinds.com/content/gundersen-postulates-unit-3-explosion-may-have-been-prompt-criticality-fuel-pool gundersen-postulates-unit-3-explosion-may-have-been-prompt-criticality-fuel-pool Fairewinds 26 April 2011 On 11 May, TEPCO released underwater robotic video from the spent fuel pool. The video appears to show large amounts of debris contaminating the pool. Based on water samples, unnamed experts and TEPCO opined that the fuel rods were left "largely undamaged".Underwater robot captures Fukushima wreckage, The Telegraph, 11 May 2011 Nuclear core damaged On 25 March, officials announced the reactor vessel might be breached and leaking radioactive material. High radiation levels from contaminated water prevented work.http://www.cnn.com/2011/WORLD/asiapcf/03/25/japan.nuclear.reactors/ Japan reactor core may be leaking radioactive material, official says CNN 25 March 2011 26 March 2011 Japan Nuclear and Industrial Safety Agency (NISA) reiterated concerns about a unit 3 breach on 30 March. NHK World reported the NISA's concerns as "air may be leaking," very probably through "weakened valves, pipes and openings under the reactors where the control rods are inserted," but that "there is no indication of large cracks or holes in the reactor vessels." As with the other reactors, water was transferred from condenser reservoirs to the suppression pool surge tanks so that condensers could be used to hold radioactive water pumped from the basement. On May 15, TEPCO revealed that the pressure vessel that holds nuclear fuel "is likely to be damaged and leaking water at units Nos. 2 and 3", which means most of the thousands of tons of water pumped into the reactors was leaked. Reactor unit 4 thumb| View into a fuel pool. The reflection of the loading crane from the water surface can also be seen. At the time of the earthquake unit 4 had been shut down for shroud replacement and refueling since 29 November 2010.http://www.nisa.meti.go.jp/english/files/en20110406-1-1.pdf NISA Seismic status report, pg 35. PDF 24 April 2011http://www.toshiba.co.jp/nuclearenergy/english/maintenance/replace/shroud00.htm Core Shroud Replacement Introduction Toshiba.co.jp 24 April 2011 All 548 fuel rods had been transferred in December 2010 from the reactor to the spent fuel pool on an upper floor of the reactor buildinghttp://www.iaea.org/newscenter/news/tsunamiupdate01.html IAEA Update on Japan Earthquake Unit 4 was shut down for a routine, planned maintenance outage on 30 November 2010. After the outage, all 548 fuel rods from the reactor was transferred to the spent fuel pool. 17 March 2011 where they were held in racks containing boron to damp down any nuclear reaction. The pool is used to store rods for some time after removal from the reactor and now contains 1,479 rods. Recently active fuel rods produce more decay heat than older ones.Wright, David Union of Concerned Scientists Spent Fuel Pools at Fukushima http://allthingsnuclear.org/post/3892719255/spent-fuel-pools-at-fukushima 17 March 2011 At 04:00 JST on Monday 14 March, water in the pool had reached a temperature of 84 °C compared to a normal value of 40–50 °C. The IAEA was advised that the temperature value remained 84 °C at 19:00 JST on 15 March, but as of 18 March, no further information was reported.http://www.nisa.meti.go.jp/english/files/en20110318-2.pdf Seismic Damage Information (the 29th Release) 18 March 2011 Nuclear and Industrial Safety Agency 12 April 2011 On 11 April, a fire broke out at unit 4. Explosion At approximately 06:00 JST on 15 March, an explosion damaged the 4th floor rooftop area of the unit 4 reactor as well as part of the adjacent unit 3.http://www.world-nuclear-news.org/RS_Attempts_to_refill_fuel_ponds_1703111.html Attempts to refill fuel ponds, update 4 17 March 2011 World Nuclear Newshttp://www.tepco.co.jp/en/press/corp-com/release/11031504-e.html Press Release: Damage to the unit 4 Nuclear Reactor Building at Fukushima Dai-ichi Nuclear Power Station TEPCO 15 March 2011 The explosion is thought to be caused by the ignition of hydrogen that had accumulated near the spent fuel pond, the hydrogen was initially thought to have come from the stored fuel rods, but later, TEPCO believed the hydrogen came from unit 3.TEPCO: No.4 blast due to hydrogen from No.3, NHK, 16 May 2011 Later reports from the US Nuclear Regulatory Commission speculated that fuel could have been ejected from the unit 4 spent fuel pond during this explosion.Maugh, Thomas H. http://www.latimes.com/news/science/la-fg-japan-reactor-damage-20110406,0,6240900.story Engineers try to lower danger level at crippled Japanese nuclear plant Los Angeles Times 6 April 2011 24 April 2011 Later on the morning of 15 March, at 09:40, the unit 4 spent fuel pool caught fire, likely releasing radioactive contamination from the fuel stored there.http://www.iaea.org/newscenter/news/tsunamiupdate01.html IAEA Update on Japan Earthquake IAEA 14 March 2011 26 March 2011http://www.reuters.com/article/2011/03/15/japan-nuclear-iaea-idUSLDE72E04G20110315 Japan spent fuel pond on fire,radioactivity out-IAEA Reuters 11 March 2011 15 March 2011 TEPCO said workers extinguished the fire by 12:00.IAEA Update http://www.iaea.org/newscenter/news/tsunamiupdate01.html 15 March 2011World Nuclear News Update http://www.world-nuclear-news.org/RS_Possible_damage_at_Fukushima_Daiichi_2_1503111.html 15 March 2011 As radiation levels rose, some of the employees still at the plant were evacuated.14 March 2011 http://www.cbc.ca/news/world/story/2011/03/14/japan-nuclear-031411.html Radiation levels could damage health Canadian Broadcasting Corporation 15 March 2011 On the morning of 15 March, Secretary Edano announced that according to the TEPCO, radiation dose equivalent rates measured from the unit 4 reached 100 mSv/h. Edano said there was no continued release of "high radiation".http://www.monstersandcritics.com/news/asiapacific/news/article_1626124.php/Government-spokesman-No-continued-radiation-from-reactor-4 Government spokesman: No continued radiation from reactor 4 Monstersandcritics.com 17 November 2010 15 March 2011 Japan's nuclear safety agency NISA reported two holes, each 8 meters square, or 64 m² (690 sq ft), in a wall of the outer building of unit 4 after the explosion.http://www.reuters.com/article/2011/03/15/japan-nuclear-holes-idUSTFD00668920110315 Japan agency: holes found in nuclear reactor building wall Reuters 15 March 2011 At 17:48 it was reported that water in the spent fuel pool might be boiling.http://www.bbc.co.uk/news/world-middle-east-12307698 BBC News LIVE: Japan earthquake 15 March 2011http://www.reuters.com/article/2011/03/15/japan-quake-fuel-boiling-idUSTFD00668620110315 Fukushima No. 4 reactor spent fuel pool may be boiling -Kyodo Reuters 15 March 2011 By 21:13 on 15 March, radiation inside the unit 4 control room prevented workers from staying there permanently.http://www.reuters.com/article/2011/03/15/japan-quake-controlroom-idUSTFD00669220110315 Radiation hits dangerous levels at Japan plant control room Reuters 11 March 2011 15 March 2011 Fujioka, Chisa Seventy staff remained at the plant, while 800 had been evacuated. By 22:30, TEPCO was reportedly unable to pour water into the spent fuel pool.http://english.kyodonews.jp/news/2011/03/78352.html Radiation leak feared at spent fuel pool, water injection ordered Kyodo News 15 March 2011 15 March 2011 By 22:50, the company was considering using helicopters to drop water,Yuasa, Shino http://www.ajc.com/business/radiation-level-soars-after-872556.html Japan to spray water, acid on stricken nuke plant ajc.com 15 March 2011 7 April 2011Associated Press http://www.foxnews.com/world/2011/03/15/japanese-nuclear-panic-rises-agency-says-radiation-leaking-atmosphere/ Nuclear Officials May Spray Japanese Power Plant With Water by Helicopter Fox News 7 April 2010 15 March 2011 but this was postponed because of concerns over safety and effectiveness, and the use of high-pressure fire hoses was considered instead.http://www.northcountrypublicradio.org/news/npr/134552475/new-fire-hits-japanese-nuclear-plant Workers Evacuated From Japanese Nuclear Reactor North Country Public Radio 18 March 2011 A fire was discovered at 05:45 JST on 16 March in the northwest corner of the reactor building by a worker taking batteries to the central control room of unit 4.http://www.tepco.co.jp/en/press/corp-com/release/11031606-e.html Press Release: Fire occurrence at Fukushima Daiichi Nuclear Power Station Unit 4 (2nd Release) TEPCO 18 March 2011http://english.kyodonews.jp/news/2011/03/78378.html Fire breaks out again at Fukushima's No. 4 reactor Kyodo News 16 March 2011 15 March 2011 This was reported to the authorities, but on further inspection at 06:15 no fire was found. Other reports stated that the fire was under control.Hiyama, Hiroshi http://www.google.com/hostednews/afp/article/ALeqM5i4cUl0XJSjemkJNeBIc9AFWrUDdg?docId=CNG.6e08417f70f28fda6826317bef892420.d21 Blasts, new fire escalate Japan's nuclear crisis Google News AFP 15 March 2011 26 March 2011 At 11:57, TEPCO released a photograph showing "a large portion of the building's outer wall has collapsed."http://www3.nhk.or.jp/daily/english/16_25.html TEPCO releases photo of No.4 reactor NHK 16 March 2011 26 March 2011 Technicians considered spraying boric acid on the building from a helicopter.http://af.reuters.com/article/energyOilNews/idAFLKE7DB01S20110315 Tokyo Electric may disperse boric acid over plant by helicopter Reuters 15 March 2011 26 March 2011http://www.voanews.com/english/news/asia/east-pacific/Crisis-Continues-at-Crippled-Japanese-Nuclear-Power-Plants-118066494.html Crisis Continues at Crippled Japanese Nuclear Power Plants VOA 16 March 2011 26 March 2011 Spent Fuel Pool On 16 March, the chairman of United States Nuclear Regulatory Commission (NRC), Gregory Jaczko, said in Congressional testimony that the NRC believed all of the water in the spent fuel pool had boiled dry.http://montreal.ctv.ca/servlet/an/local/CTVNews/20110316/nuclear-fuel-rods-110316/20110316/ No water in spent fuel pool at Japanese plant: U.S. CTV News 16 March 2011http://www.nydailynews.com/news/world/2011/03/17/2011-03-17_talk_of_doomsday_in_japan.html Japan nuclear crisis: Meltdown at Fukushima Daiichi plant may now be inevitability New York Daily News 17 March 2011 Japanese nuclear authorities and TEPCO contradicted this report, but later in the day Jaczko stood by his claim saying it had been confirmed by sources in Japan.http://www.nytimes.com/2011/03/17/world/asia/17nuclear.html U.S. Calls Radiation 'Extremely High,' Sees Japan Nuclear Crisis Worsening The New York Times 17 March 2011 David E. Sanger Matthew L. Wald Hiroko Tabuchi At 13:00 TEPCO claimed that helicopter observation indicated that the pool had not boiled off.Japanese http://www.yomiuri.co.jp/science/news/20110317-OYT1T00480.htm ４号機プール内に大量の水、自衛隊ヘリ確認 Yomiuri Shimbun Japan 17 March 2011 The French Institut de Radioprotection et de Sûreté Nucléaire (IRSN) agreed, stating that helicopter crews diverted planned water dumps to unit 3 on the basis of their visual inspection of unit 4.Jonathan Weisman. "Did NRC's Jaczko Misspeak?". The Wall Street Journal. 17 March 2011. At approximately 14:30 on 16 March, TEPCO announced that the storage pool, located outside the unit 4 containment area,Black, Richard http://www.bbc.co.uk/news/science-environment-12762608 Japanese emperor 'deeply worried' BBC News BBC News 16 March 2011 23 March 2011 might be boiling. Around 20:00 JST it was then planned to use a police water cannon to spray water on unit 4.http://www.reuters.com/article/2011/03/16/idUSTFD00670420110316 Water cannon truck to tackle spent nuclear fuel pool Reuters 16 March 2011 Lies, Elaine On 18 March, it was reported that water sprayed into the spent fuel pool was disappearing faster than evaporation could explain, suggesting leakage.U.S. nuclear officials suspect Japanese plant has a dire breach http://www.latimes.com/news/nationworld/world/la-fg-japan-quake-wrapup-20110318,0,2262753.story 18 March 2011 Los Angeles Times 18 March 2011 Ralph Vartabedian Barbara Demick Laura KingFrantic Repairs Go On at Plant as Japan Raises Severity of Crisis http://www.nytimes.com/2011/03/19/world/asia/19japan.html 18 March 2011 The New York Times 18 March 2011 Hiroko Tabuchi Keith Bradsher SDF military trucks sprayed water onto the building to try to replenish the pool on 20 March. On 22 March, the Australian military flew in Bechtel-owned robotic equipment for remote spraying and viewing of the pool. The Australian reported this would give the first clear view of the pool in the "most dangerous" of the reactor buildings.Peter Alford http://www.theaustralian.com.au/australian-robotic-equipment-to-aid-in-water-dousing-reactors/story-fn84naht-1226025692481 Australian robotic equipment to aid in water dousing reactors The Australian 22 March 2011 26 March 2011 The IAEA reported, "From 22 March to 25 March 130 to 150 tonnes of seawater were poured into the spent fuel pool each day using a concrete pump equipped with a long articulated arm. Seawater was also poured in through spent fuel cooling system from 21:05 UTC 24 March to 01:20 25 March. White smoke was still being observed coming from the reactor building as of 23:00 UTC 25 March."http://www.iaea.org/press/?p=1775 Fukushima Daiichi Nuclear Accident Update (27 March, 01:15 UTC) : IAEA Alert Log: Fukushima Daiichi Nuclear Accident Iaea.org 27 March 2011 7 April 2011 On 29 March, the seawater was changed to fresh water.http://www.cnn.com/2011/WORLD/asiapcf/03/30/japan.nuclear.status/index.html CNN Status report: Reactor-by-reactor at the Fukushima Daiichi plant 30 March 2011 Analysis of spent fuel pool water collected on 12 April suggests that while some of the 1535 fuel assemblies stored there may have been damaged, the majority of the stored fuel assemblies are intact based on measured radiation levels.http://www.world-nuclear-news.org/RS-Most_fuel_in_Fukushima_4_pool_undamaged-1404117.html Fukushima Most fuel in Fukushima 4 pool undamaged world-nuclear-news.org 14 April 2011 15 April 2011 TEPCO further stated that "the fuel rods in the unit 4 pool had released caesium-134 and −137 in the process of being damaged," and that TEPCO would "need to continue monitoring it."Radiation surges above 4's fuel pool|The Japan Times Online. Search.japantimes.co.jp (2011-04-13). Retrieved on 2011-04-30. On 13 April, TEPCO reported that the temperature of the spent fuel pool had increased to 90 °C, and that the radiation level 6 meters above the pool had reached 84 mSv/h. The spike was later attributed to a failure to properly keep the SFP covered in water.NTI: Global Security Newswire - Japan Plant Emits More Radiation After Cooling Lapse. Global Security Newswire (2011-04-14). Retrieved on 2011-04-30. As of 25 April, TEPCO was still pumping between 70 and 210 tons of water into the pool, varying the amounts depending on the temperature in the pool. TEPCO also reported that it was attempting to minimize the amount of water added to the pool for fear "the weight of the water could weaken the reactor building."Monitoring rising temperatures, NHK, 25 April 2011 On 28 April, TEPCO announced it believed that water was not leaking from the pool but only evaporating. TEPCO based its belief on calculations that the heat generated by the spent fuel stored in the pool would be expected to evaporate 140 to 210 tons of water daily, in line with the amount of replacement water it adds.TEPCO: Water isn't leaking from No. 4 reactor pool, NHK, 28 April 2011 On 9 May, TEPCO began work to install a supporting structure for the unit 4 spent fuel pool, due to the concerns that explosions could have weakened the structure.Seismic Damage Information (the 132nd Release) Possibility of criticality in the spent fuel pool Visual inspection of the spent fuel rod pool on reactor 4 on April 30 has shown that that there is no significant visible damage to the fuel rods in the pool. This observation is inconsistent with speculation of prompt criticality.http://www.world-nuclear-news.org/RS_No_significant_damage_to_fuel_at_unit_4_3004111.html No significant damage to fuel at unit 4 world-nuclear-news.org 30 April 2011 Reactor units 5 and 6 thumb|Unit 5&6 connection to the 500 kV Futaba Line (双葉線) Both reactors were offline at the time the earthquake struck (reactor 5 had been shut down on 3 January 2011 and reactor 6 on 14 August 2010), although they were still fueled, unlike reactor 4 where the fuel rods had been removed prior to the earthquake. Government spokesman Edano stated on 15 March that reactors 5 and 6 were being closely monitored, as cooling processes were not functioning well.Staff http://edition.cnn.com/2011/WORLD/asiapcf/03/15/japan.nuclear.reactors/?hpt=T1 Officials: Spent fuel rods may have burned in blaze at nuclear plant – CNN.com CNN 16 March 2011 15 March 2011 At 09:16 JST, the removal of roof panels from reactor buildings 5 and 6 was being considered in order to allow any hydrogen build-up to escape. At 21:00 on 15 March, water levels in unit 5 were reported to be 2 m above fuel rods, but had fallen 40 cm in 5 hours. Published water temperatures on 18 March showed 182 °C inside reactor 5 and 161 °C in reactor 6.Conditions of Fukushima Dai‐ichi Nuclear Power Stations Unit 1 On 17 March, unit 6 was reported to have operational diesel-generated power and this was to be used to power pumps in unit 5 to run the Make-up Water Condensate System (MUWC) to supply more water. Preparations were made to inject water into the reactor pressure vessel once external power could be restored to the plant, as water levels in the reactors were considered to be declining. NISA reported that connections from the grid to all units was complete 20 MarchSeismic Damage Information (the 104th Release)(As of 13:00 April 20st, 2011) through new cables and transformers. Information provided to the IAEA indicated that storage pool temperatures at both units 5 and 6 remained steady around 60–68 °C between 19:00 JST 14 March and 21:00 JST 18 March, though rising slowly. On 18 March reactor water levels remained around 2 m above the top of fuel rods.http://www.nisa.meti.go.jp/english/files/en20110319-2.pdf Seismic Damage Information (the 31st Release（Revised）) 18 March 2011 Nuclear and Industrial Safety Agency 12 April 2011 It was confirmed that panels had been removed from the roofs of units 5 and 6 to allow any hydrogen gas to escape. At 04:22 on 19 March, the second unit of emergency generator A for unit 6 was restarted which allowed operation of pump C of the residual heat removal system (RHR) in unit 5 to cool the spent fuel storage pool.http://www.nisa.meti.go.jp/english/files/en20110319-4.pdf Seismic Damage Information (the 32nd Release) 19 March 2011 Nuclear and Industrial Safety Agency 12 April 2011 Later in the day, pump B in unit 6 was also restarted to allow cooling of the spent fuel pool there.http://www.tepco.co.jp/en/press/corp-com/release/11032005-e.html Press Release | Plant Status of Fukushima Daiichi Nuclear Power Station (as of 2:00 pm Mar 20th) TEPCO 26 March 2011 Temperature at unit 5 pool decreased to 48 °C on 19 March 18:00 JST,Yomiuri Shinbun http://www.yomiuri.co.jp/national/news/20110319-OYT1T00851.htm?from=main3 ３号機へ昼夜継続し放水、４号機への放水も検討 20 March 2011 and 37 °C on 20 March when unit 6 pool temperature had fallen to 41 °C.http://www.nisa.meti.go.jp/english/files/en20110320-3.pdf Seismic Damage Information (the 35th Release) 20 March 2011 Nuclear and Industrial Safety Agency 12 April 2011 On 20 March, NISA announced that both reactors had been returned to a condition of cold shutdown.http://www.nisa.meti.go.jp/english/files/en20110322-1-1.pdf Seismic Damage Information (the 40th Release(corrected)) 21 March 2011 Nuclear and Industrial Safety Agency 12 April 2011http://english.kyodonews.jp/news/2011/03/80015.html Work to restore power delayed as smoke seen at Fukushima reactors | Kyodo News Kyodo News 23 March 2011 On 23 March, it was reported that the cooling pump at reactor No 5 stopped working when it was transferred from backup power to the grid supply.http://www.nytimes.com/2011/03/24/world/asia/24nuclear.html The New York Times Bradsher, Keith New Problems Arise at Japanese Nuclear Plant 23 March 2011Seismic Damage Information (the 47th Release) (As of 08:00 March 24th, 2011), Nuclear and Industrial Safety Agency, News Release, 24 March 2011 This was repaired and the cooling restarted approximately 24 hours later. RHR cooling in unit 6 was switched to the permanent power supply on 25 March.http://www.nisa.meti.go.jp/english/files/en20110329-3-1.pdf Seismic Damage Information (the 59th Release-Corrected) 28 March 2011 Nuclear and Industrial Safety Agency 12 April 2011 Radiation levels and radioactive contamination thumb|Map of contaminated areas around the plant (22 March-3 April). Radiation effects from Fukushima I nuclear accidents Radioactive material has been released from the Fukushima containment vessels as the result of deliberate venting to reduce gaseous pressure, deliberate discharge of coolant water into the sea, and accidental or uncontrolled events. Junichi Matsumoto, acting head of TEPCO's Nuclear Power & Plant Siting Division, acknowledged the seriousness of the Fukushima accident at a [12 April] press conference stating, "although the details of the [Chernobyl and Fukushima] accidents are different, from the standpoint of how much radiation has been released, [Fukushima] is equal to or more serious than Chernobyl."http://www.yomiuri.co.jp/dy/national/T110413005584.htm Huge radiation release led to severity hike Yomiuri Shimbun Japan 14 April 2011 24 April 2011 Using Japanese Nuclear Safety Commission numbers, Asahi Shimbun reported that by 24 March the accident might have emitted 30,000 to 110,000 TBq of iodine-131.http://www.asahi.com/english/TKY201103250204.html Radiation from Fukushima exceeds Three Mile Island Asahi Shimbun Japan 26 March 2011 The highest reported radiation dose rate outside was 1000 mSv/h on 16 March.CBS/AP http://www.cbsnews.com/stories/2011/03/15/501364/main20043621.shtml Radiation spike hinders work at Japan nuke plant CBS News 18 March 2011 15 March 2011 On 29 March, at times near unit 2, radiation monitoring was hampered by a belief that some radiation levels may be higher than 1000 mSv/h, but that "1,000 millisieverts is the upper limit of their measuring devices." The maximum permissible dose for Japanese nuclear workers was increased to 250 mSv/year, for emergency situations after the accidents.The New York Times NY, USA http://www.nytimes.com/2011/03/16/world/asia/16workers.html Asia 2011‐3‐16 Last Defense at Troubled Reactors: 50 Japanese Workers Keith Bradsher Hiroko TabuchiNHK JP http://www3.nhk.or.jp/daily/english/16_19.html Gov't ups permissible radiation level TEPCO has been criticized in providing insufficient safety equipment for its workers, including accusations of a lack of monitoring and decontamination equipment, and for giving the most dangerous work to subcontractors.http://english.kyodonews.jp/news/2011/03/82005.html FOCUS: Subcontractor questions safety management at Fukushima nuclear plant Kyodo News 7 April 2011http://abcnews.go.com/International/japan-nuclear-crisis-worker-speaks-radiation-dangers/story?id=13271759 Japan Nuclear Crisis: Worker Speaks Out About Radiation Dangers Abcnews.go.com 1 April 2011 7 April 2011Yue, Terril http://www.reuters.com/article/2011/04/01/us-japan-quake-jumpers-health-idUSTRE7303HD20110401 "Jumpers" offered big money to brave Japan's nuclear plant Reuters 7 April 2011 1 April 2011Contaminated nuke plant workers going back on job as safety regs go by wayside, Mainichi, 14 May 2011 The Japanese Ministry of Health, Labour and Welfare announced that levels of radioactivity exceeding legal limits had been detected in milk produced in the Fukushima area and in certain vegetables in Ibaraki. On 23 March, Tokyo drinking water exceeded the safe level for infants, prompting the government to distribute bottled water to families with infants.Anxiety in Tokyo over radiation in tap water, Business Week, 23 March 2011 Seawater near the discharge of the plant elevated levels of iodine-131 were found on 22 March, which had increased to 3,355 times the legal limit on 29 March. Also concentrations far beyond the legal limit were measured for caesium-134 and caesium-137 were more than 100 times above the limit. Contamination of basements, wiring trenches, and pipe tunnels thumb|Side view of the Fukushima trenches and tunnels. 1: Reactor building, 2: Turbine generator and associated condenser. As illustrated in the diagram to the right, the Fukushima I nuclear plant has a number of trenches and pipe tunnels that stretch from each unit's reactor (diagram #1), to the unit's turbine building (diagram #2), to the sea (to the right of diagram #6).http://www.google.com/url?sa=t&source=web&cd=1&ved=0CBUQFjAA&url=http%3A%2F%2Fwww.asahi.com%2Fphotonews%2Fgallery%2Finfographics%2F110402info05.html&ei=VfKXTfnUG8Xi0gGBreGADA&usg=AFQjCNEloHtCW0HgUq-UpSL7jlcrCHUN-g Impact on civilian life and the Fukushima Daiichi nuclear power plant accident illustrated Google 7 April 2011 In some locations these connections are open trenches, while in other locations the connections are pipe tunnels. During work to restore power to unit 2 on 27 March, TEPCO reported very high levels of radiation in water in the basement of the unit 2 turbine building. While first reported radiation levels of more than 10 million times usual appeared later to be erroneous, the radiation measurements were more than 100,000 times higher than usual.Woes deepen over radioactive water at nuke plant, sea contamination http://english.kyodonews.jp/news/2011/03/81375.html Kyodo News Network 27 March 2011 28 March 2011 On 28 March, the Nuclear Safety Commission announced its suspicion that "radioactive substances from temporarily melted fuel rods at the No. 2 reactor had made their way into water in the reactor containment vessel and then leaked out through an unknown route".http://www3.nhk.or.jp/daily/english/28_h28.html Radiation hampers cooling efforts .nhk.or.jp 28 March 2011 7 April 2011 Highly radioactive water was later found in trenches at three of the units.http://www3.nhk.or.jp/daily/english/29_05.html TEPCO faces challenge in cooling reactor .nhk.or.jp 29 March 2011 7 April 2011 These trenches stretch toward, but do not directly connect to, the sea (see diagram #6). On 30 March, the units 2 and 3 trenches were 1 m below the level at which they would overflow into the sea. In comparison, the unit 1 trench was 10 cm from overflowing. The high levels of water in the trenches combined with their potential to overflow to the sea complicated the cooling efforts because the water required to cool the reactor was believed to also be filling the trenches. Hence, cooling unit 2 with large quantities of fresh water was expected to cause the trenches, leading to the sea, to fill and overflow—worsening the radioactivity release. Consequently, TEPCO reduced the amount of water injected into unit 2 from 16 to 7 ton per hour. TEPCO used two approaches to prevent the highly radioactive water from leaking into the sea.https://english.kyodonews.jp/news/2011/04/83451.html Highly radioactive water leaking into sea stops: TEPCO 6 April 2011 12 April 2011 Kyodo News Pumping the water from the basement thumb|Construction of internationally-compatible emergency pump valves for Fukushima complex, Yokota AB The first approach to prevent tunnel water from leaking into the sea was to pump the tunnels dry. Beginning on 27 March, operators attempted to pump water from the turbine hall basement (see the tunnel below diagram #2) to the condenser (the large black vessel). By pumping water out of the basement, TEPCO expected to lower the trench water level, and reduce the likelihood of overspill to the sea. However, "both condensers turned out to be full," which prevented pumping. Therefore, pumps able to shift 10 to 25 tons of water per hour were used to move condenser water to storage tanks, freeing condenser storage for water that was in the basement of unit 2. However, since both the storage tanks and the condensers were nearly full, TEPCO also considered using tankers or a "mega float" as a temporary storage location for the radioactive water.http://www.gizmodo.com.au/2011/04/fukushimas-radioactive-water-to-be-pumped-into-mega-float/ Fukushima's radioactive water to be pumped into 'Mega Float' .nhk.or.jp 30 March 2011 7 April 2011http://e.nikkei.com/e/fr/tnks/Nni20110401D01JFF02.htm Tepco may use floating island to hold tainted water E.nikkei.com 2 April 2011 7 April 2011 Regardless of the availability of offshore storage for radioactive-contaminated water, TEPCO decided to pump its least contaminated water, approximately 100 times the legal limit, from a wastewater treatment plant, out to sea on 5 April to free storage space.http://translate.google.com/translate?js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&sl=auto&tl=en&u=http%3A%2F%2Fwww.yomiuri.co.jp%2Fnational%2Fnews%2F20110404-OYT1T00580.htm&act=url Increase your water play pool, use of Mega-Float for fishing Google 24 April 2011Westall, Sylvia http://www.reuters.com/article/2011/04/04/us-japan-nuclear-water-idUSTRE7336L720110404 Japan to dump 11,500 metric tons of radioactive water The wastewater facility had 11,500 tons of water stored (by 10 April 8900 tons had been pumped into the sea Reuters 24 April 2011 4 April 2011).asahi.com（朝日新聞社）：Radiation fallout from Fukushima plant will take "months" to stop - English. Asahi.com (2011-04-04). Retrieved on 2011-04-30. At the same time, on 5 April, TEPCO began pumping water from the units condensers of units 1–3 to their respective condensation storage tanks to free room for the trench water. Plugging the source of the water thumb|Leakage route of highly radioactive water through a gravel layer.1: Reactor building, 2: Turbine building, 3: Injection of sodium silicate. The second approach used by TEPCO to limit overflow into the sea was to plug leaks into pits that were connected to the trenches. Eventually, leaks would be discovered in pits in unit 2 (discovered 1 April) and unit 3 (discovered 11 May).Tepco investigates new Fukushima leak, World Nuclear News, 11 May 2011Possible leakage of water including radioactive materials to the outside from around the intake canal of Unit 3 of Fukushima Daiichi Nuclear Power Station, TEPCO, 11 May 2011 While the later found leak in unit 3 was reported to be plugged with one day, the unit 2 pit-leak took much longer to stop. Discovered on 1 April, the leak in the unit 2 pit was located near the unit 2 reactor basement and above the trench system. The crack in the pit was reported at the time to be the primary source of water to the trench system; however, at that time, the unit 3 leak was unknown. TEPCO reported the unit 2 leak was from a crack 20 cm in size, and that it may have been leaking since the magnitude 9 earthquake shook the plant on 11 March until finally patched on 6 April.David Batty and agencies http://www.guardian.co.uk/world/2011/apr/02/japan-fukushima-radioactive-water-leaking-sea Radioactive water from Japan's Fukushima plant is leaking into sea Guardian 7 April 2011 London 2 April 2011http://e.nikkei.com/e/fr/tnks/Nni20110402D02JF750.htm Source Of Toxic Leaks Found At Japan Nuclear Plant E.nikkei.com 2 April 2011 7 April 2011 However, radiation levels above the pit exceeded 1000 mSv/h (1 Sv/h, 100 Rem/h), hampering technicians to safely work.Rick Wallace, Tokyo Correspondent http://www.theaustralian.com.au/news/world/bodies-found-as-nuclear-plant-leak-poisons-ocean/story-e6frg6so-1226032895940 Bodies found as nuclear plant leak poisons ocean The Australian 7 April 2011 Regardless, TEPCO attempted to use sandbags and concrete to plug the leak. However, by 2 April, TEPCO acknowledged the water was still leaking into the trenches and to the sea.http://www.latimes.com/news/nationworld/world/la-fg-japan-quake-20110403,0,2146668.story Two workers' bodies recovered at Fukushima nuclear plant Julie Makinen Kenji Hall Los Angeles Times 3 April 2011 12 April 2011 On 2 April, TEPCO said that it had again attempted to plug the hole, now using 2,000 liters of a synthetic resin.http://www.cnn.com/2011/WORLD/asiapcf/04/02/japan.nuclear.reactors/ Official: Radioactive water leaking into sea through crack in concrete CNN 29 March 2011 7 April 2011 TEPCO attempted to inject a polymeric water absorbent, used for diapers, into pipes leading to the pit; this absorbent was also coupled with sawdust and shredded newspapers.http://www3.nhk.or.jp/daily/english/03_22.html Radioactive water continues to leak .nhk.or.jp 3 April 2011 7 April 2011 However, on 3 April and 4 April, this approach appeared to have failed to slow the leak, leading TEPCO to use a colored dye to confirm the location and size of the leak.http://www3.nhk.or.jp/daily/english/03_22.html Radioactive water continues to leak NHK WORLD English 3 April 2011 7 April 2011http://english.kyodonews.jp/news/2011/04/82995.html Tokyo Electric struggles to pin down source of seawater pollution Kyodo News 24 April 2011 The dye indicated the leak was from a cracked pipe and seeping through gravel into the pit.http://www3.nhk.or.jp/daily/english/05_h32.html Leak at Fukushima appears to be lessening .nhk.or.jp 5 April 2011 24 April 2011 On 5 April, TEPCO began using liquid glass to attempt to stop the leak. Finally, on 6 April, TEPCO drilled a hole into the pit near unit 2 and injected water glass (sodium silicate) into the pit.NHK, "Radioactive water leak at Fukushima plant stops", 6 April 2011. The residual heat carried by the water used for cooling the damaged reactors accelerated the setting of the injected mixture. Shortly afterward, TEPCO announced that water had stopped leaking from the pit.http://www.world-nuclear-news.org/RS-Fukushima_workers_start_emptying_trench_water-1304115.html Fukushima workers start emptying trench water World-nuclear-news.org 13 April 2011 24 April 2011 In an attempt to prevent future leaks, TEPCO installed seven steel plates at unit 2 that would prevent water from flowing out the plant's water intakes (see diagram #6). Additional plates were expected to be added at the other Fukushima units. However, these plates were later suspected of "stirring up" radioactive debris, and to have significantly increased radiation measured in the sea.http://www.nytimes.com/2011/04/17/world/asia/17nuke.html Levels of Radioactive Materials Rise Near Japanese Plant The New York Times 17 April 2011 24 April 2011 Long term, TEPCO is "also considering pouring adhesive concrete into the suppression chamber of reactor 2 to patch the hole that is believed to be causing radioactive water to leak into the turbine building and the trench."http://search.japantimes.co.jp/cgi-bin/nn20110418x1.html Robots detect dangerous spike in reactor 3 radiation Japan Times 18 April 2011 24 April 2011 On 21 April, TEPCO estimated that 520 tons radioactive water leaked into the sea before leaks were plugged, releasing 4,700 TBq (20,000 times facility's annual limit).http://www3.nhk.or.jp/daily/english/21_35.html TEPCO estimates 520-ton radioactive water into sea .nhk.or.jp 24 April 2011 TEPCO did not estimate the amount of water that escaped from the unit 3 leak, but did say the leaked water was contaminated with iodine-131, caesium-137 and caesium-134 far beyond regulatory limits,Water poses questions for Tepco, World Nuclear News, 12 May 2011 and that the leak was patched the same day it was discovered. Ongoing efforts With the leak plugged, at least temporarily, on 10 April TEPCO returned to the work began on 27 March, removing water from the tunnel system so repairs could be made to the plant's original cooling system. Removal is considered essential because the water is so radioactive, in excess to the 1000 mSv/h measuring equipment's range, that repair work cannot be safely conducted without removing the waterhttp://english.kyodonews.jp/news/2011/04/84319.html Highly radioactive water in nuke plant to be moved for storage.http://www3.nhk.or.jp/daily/english/05_38.html Plant radiation monitor says levels immeasurable Kyodo News 24 April 2011 By 13 April, TEPCO had pumped approximately "250 tonnes of highly radioactive water from the trench into the unit's turbine condenser," lowering the trench water-level by 4 cm. The water was approximately 99 cm deep originally. TEPCO estimated that pumping would take "about 40 hours to move some 700 tonnes of water from the trench." Water would eventually have to be removed from the unit 2 basement, as well as from the trenches and basements of units 1 and 3. By 15 April, TEPCO estimated that 660 tons of 60,000 tons of the highly radioactive water had been pumped from the trenches.http://english.kyodonews.jp/news/2011/04/85532.html Groundwater radiation level at nuke plant rises Kyodo News 24 April 2011 The water level was believed to have fallen by 8 cm. and TEPCO announced it expected to start storing some of the trench water in storage spaces freed up by dumping 9,100 tons of slightly contaminated water from a wastewater treatment plant from 4 April to 10 April.http://www3.nhk.or.jp/daily/english/16_23.html Wastewater level at Fukushima reactor rising .nhk.or.jp 16 April 2011 24 April 2011 However, shortly after announcing the reduction in level, the water level began increasing again, a 2.5 cm increase on 16 April,http://www3.nhk.or.jp/daily/english/16_09.html Wastewater level at No.2 reactor tunnel rising .nhk.or.jp 16 April 2011 24 April 2011 and a 3 cm increase on 17 April were believed to have been caused by the earlier efforts to patch leaks to the ocean. On 19 April, TEPCO estimated that the unit 2 turbine basement contained 25,000 cubic meters of contaminated water,Transfer to the Process Main Building, TEPCO it would later estimate this water contained 400 PBq of radioactivity.TEPCO drowning in dealing with tons of radioactive, Asahi, 13 May 2011 Then, on 20 April, TEPCO began pumping the basement water to the wastewater treatment facility.http://nuclearstreet.com/nuclear_power_industry_news/b/nuclear_power_news/archive/2011/04/20/plans-to-manage-radioactive-water-advancing-at-fukushima-daiichi042002.aspx Plans to Manage Radioactive Water Advancing at Fukushima Daiichi Nuclearstreet.com 20 April 2011 24 April 2011 By 27 April, TEPCO had pumped 1.89 million liters of the highly contaminated water to the processing plant, and announced plans to add more pumping capability. While progress was being made on pumping the unit 2 basement, on 14 May, TEPCO announced that it appeared that the unit 1 basement is also "half full" of radioactive water that was expected to delay cleanup efforts.Fukushima Reactor Bldg.'s Basement Half Filled with Water, Jiji Press, 14 May 2011 On 15 May, TEPCO announced plans to pump approximately 4,000 tons of 22,000 tons contaminated water from the unit 3 turbine building basement and trench system; the water was 1.4 m high in the basement. Central fuel storage areas Used fuel assemblies taken from reactors are initially stored for at least 18 months in the pools adjacent to their reactors. They can then be transferred to the central fuel storage pond. This contains 6375 fuel assemblies and was reported "secured" with a temperature of 55 °C. After further cooling, fuel can be transferred to dry cask storage, which has shown no signs of abnormalities.Spraying continues at Fukushima Daiichi http://www.world-nuclear-news.org/RS_Spraying_continues_at_Fukushima_Daiichi_1803111.html 19 March 2011 18 March 2011 On 21 March temperatures in the fuel pond had risen a little to 61 °C and water was sprayed over the pool. Power was restored to cooling systems on 24 March and by 28 March temperatures were reported down to 35 °C. Accident rating thumb|Comparison of radiation levels for different nuclear events. The severity of the nuclear accident is provisionallyhttp://www.nisa.meti.go.jp/english/files/en20110412-4.pdf NISA News Release April 12, 2011 PDF 24 April 2011 rated 7 on the International Nuclear Event Scale (INES). This scale runs from 0, indicating an abnormal situation with no safety consequences, to 7, indicating an accident causing widespread contamination with serious health and environmental effects. Prior to Fukushima, the Chernobyl disaster was the only level 7 accident on record, while the Three Mile Island accident was a level 5 accident. The Japan Atomic Energy Agency initially rated the situation at unit 1 below both of these previous accidents; on 13 March it announced it was classifying the event at level 4, an "accident with local consequences".http://www.reuters.com/article/2011/03/12/us-japan-quake-rating-idUSTRE72B2FR20110312 Japan rates quake less serious than Three Mile Island, Chernobylauthor=Maeda, Risa 12 March 2011 Reuters 12 March 2011 On 18 March it raised its rating on units 1, 2 and 3 to level 5, an "accident with wider consequences". It classified the situation at unit 4 as a level 3 "serious incident".Richard Black http://www.bbc.co.uk/news/world-12783832 BBC News – Japan earthquake: Fukushima nuclear alert level raised BBC News 19 March 2011 18 March 2011 Several parties disputed the Japanese classifications, arguing that the situation was more severe than they were admitting at the time. On 14 March, three Russian experts stated that the nuclear accident should be classified at Level 5, perhaps even Level 6.Shuster, Simon Fire at Fourth Reactor: Is Worse Yet to Come in the Fukushima Nuclear Disaster? http://www.time.com/time/world/article/0,8599,2059232,00.html Time 15 March 2011 One day later, the French nuclear safety authority ASN said that the Fukushima plant could be classified as a Level 6.Maitre, Marie UPDATE 1-French nuclear agency now rates Japan accident at 6 http://www.reuters.com/article/2011/03/15/japan-quake-nuclear-france-idUSLDE72E2M920110315 Reuters 16 March 2011 Matthew Jones 15 March 2011 2011 03 18 as of 18 March, the French nuclear authority—and as of 15 March, the Finnish nuclear safety authority—estimated the accidents at Fukushima to be at Level 6 on the INES.http://www.reuters.com/article/2011/03/15/japan-quake-nuclear-france-idUSLDE72E2M920110315 UPDATE 1-French nuclear agency now rates Japan accident at 6 Reuters 15 March 2011 18 March 2011http://www.hs.fi/ulkomaat/artikkeli/STUK+Fukushiman+turman+vakavuus+jo+kuutosluokkaa/1135264592277 STUK: Fukushiman turman vakavuus jo kuutosluokkaa Helsingin Sanomat 15 March 2011 Finnish On 24 March, a scientific consultant for noted anti-nuclear environmental group Greenpeace, working with data from the Austrian ZAMGhttp://www.zamg.ac.at/docs/aktuell/Japan2011-03-22_1500_E.pdf Spread of Radioactivity/first source estimates from CTBTO data ZAMG 22 March 2011 and French IRSN, prepared an analysis in which he rated the total Fukushima accident at INES level 7.Greenpeace analysis: Fukushima accident already INES level 7 Greenpeace thumb|left|Radiation releases during the initial hydrogen explosions. The Asahi Shimbun newspaper reported on 26 March that the accident might warrant level 6, based on its calculations. The Wall Street Journal stated that Japan's NISA would make any decision on raising the level.http://blogs.wsj.com/japanrealtime/2011/03/25/at-a-glance-crisis-rating-white-smoke-at-plant-death-toll-tops-10000/ At a Glance: Crisis Rating, Worker Injuries, Death Toll Tops 10,000 25 March 2011 25 March 2011 The Wall Street Journal INES level 6, or "serious accident," had only been applied to the Kyshtym disaster (Soviet Union, 1957), while the only level 7 was Chernobyl (Soviet Union, 1986). Previous level 5 accidents included the Windscale fire (United Kingdom, 1957); the Lucens reactor (Switzerland, 1969); Three Mile Island (United States, 1979); and the Goiânia accident (Brazil, 1987). Assessing "seriousness" as partial or full meltdown at a civilian plant, The New York Times reported on 3 April that based on remote sensing, computer "simulations suggest that the number of serious accidents has suddenly doubled, with three of the reactors at the Fukushima Daiichi complex in some stage of meltdown." The Times counted three previous civilian meltdowns, from World Nuclear Association information: Three Mile Island; Saint-Laurent Nuclear Power Plant (France, 1980, INES level 4); and Chernobyl. http://www.nytimes.com/2011/04/03/science/03meltdown.html From Afar, a Vivid Picture of Japan Crisis William J. Broad 2 April 2011 The New York Times On 11 April, the Japanese Nuclear and Industrial Safety Agency (NISA) temporarily raised the disaster at Fukushima Daiichi to Level 7 on the INES scale, by considering the whole event and not considering each reactor as an individual event per se (rated between 3 and 5). This would make Fukushima the second Level 7 "major accident" in the history of the nuclear industry; having said that, radiation released as a result of the events at Fukushima was, as of April 12, only approximately 10% of that released as a result of the accident at Chernobyl (1986), also rated as INES Level 7.Austria http://www.iaea.org/newscenter/news/2011/fukushima120411.html IAEA Fukushima Nuclear Accident Update Log – Updates of 12 April 2011 Iaea.org 12 April 2011 24 April 2011 Radiation in other countries Radiation effects from Fukushima I nuclear accidents#Distribution outside Japan The Fukushima accident has led to "trace" amounts of radiation, including iodine-131 and caesium-134/137, being observed around the world (New York State, Alaska, Hawaii, Oregon, California, Montreal, and Austria).Fukushima radioactive fallout nears Chernobyl levels - health - 24 March 2011. New Scientist. Retrieved on 2011-04-30.Report: Emissions from Japan plant approach Chernobyl levels, USA Today, 24 March 2011Doughton, Sandi. (2011-04-05) Local News|Universities come through in monitoring for radiation|Seattle Times Newspaper. Seattletimes.nwsource.com. Retrieved on 2011-04-30. A widely cited Austrian Meteorological Service report estimated the total amount of I-131 radiation released as of 19 March based on extrapolating data from several days of ideal observation at a handful of worldwide CTBTO radionuclide measuring facilities (Freiburg, Germany; Stockholm, Sweden; Takasaki, Japan and Sacramento, USA) during the first 10 days of the accident.http://www.zamg.ac.at/docs/aktuell/Japan2011-03-24_1600_E.pdf Accident in the Japanese NPP Fukushima: Spread of Radioactivity PDF 24 April 2011http://www.newscientist.com/article/dn20285-fukushima-radioactive-fallout-nears-chernobyl-levels.html Fukushima radioactive fallout nears Chernobyl levels Newscientist.com 24 April 2011 The report's estimates of total I-131 emissions based on these worldwide measuring stations ranged from 10 PBq to 700 PBq. This estimate was 1% to 40% of the 1760 PBqhttp://www.nisa.meti.go.jp/english/files/en20110412-4.pdf INES Rating on the Events in Fukushima Dai-ichi Nuclear Power Station (source rounds off to 1800) PDF 24 April 2011 of I-131 estimated to be release at Chernobyl. This report may not have been updated, but for comparison, a 12 April NISA report estimated the total I-131 release (based upon Japanese measurement equipment) at 130 to 150 PBq total release for the longer period of time. This would be approximately 7% to 9% of the I-131 Chernobyl release.http://www.nisa.meti.go.jp/english/files/en20110412-4.pdf INES Rating on the Events in Fukushima Dai-ichi Nuclear Power Station PDF 24 April 2011 A UC Berkeley professor of nuclear engineering who is measuring radionuclide detected in California, but not estimating the total release, asserted "that the fallout poses no significant health threat."Doughton, Sandi http://seattletimes.nwsource.com/html/localnews/2014693490_nukemonitors06m.html Universities come through in monitoring for radiation Seattletimes.nwsource.com 5 April 2011 24 April 2011 The expert who prepared the Austrian Meteorological Service report asserted that the "Chernobyl accident emitted much more radioactivity and a wider diversity of radioactive elements than Fukushima Daiichi has so far, but it was iodine and caesium that caused most of the health risk – especially outside the immediate area of the Chernobyl plant." As of 28 April, the Washington State Department of Health, one of the U.S. states nearest Japan, reported that levels of radioactive material from the Fukushima plant had dropped significantly, and were often below levels that could be detected with standard tests.Radioactive material in the state air from Japan nuclear reactors way down, Washington Department of Health, 28 April 2011 Radiation from direct fallout The levels detected by air filters in countries outside Japan are extremely low. Health Canada stated that the increase measured in Canada was less than the natural day-to-day variation in the existing background levels; the presence of fallout could only be detected by analysing the isotopes present, and there was no significant increase in the total level of radiation.http://www.hc-sc.gc.ca/hc-ps/ed-ud/respond/nuclea/data-donnees-eng.php Health Canada's Radiation Monitoring Data Hc-sc.gc.ca 24 April 2011 Health Canada put the extra radiation in Canada's air due to Fukushima for 18 March at 0.5 nSv, compared to background levels from 20 to 1200 nSv depending on the region. In the US, monitoring was carried out by government agencies – the EPA,Japanese Nuclear Emergency: Radiation Monitoring, EPA's RadNet Monitoring Data the Department of Energy and the Department of Health – as well as independent university teams. Both found low levels of radiation. The government bodies were criticised for their slower, less detailed release of information; Robert Alvarez, a nuclear policy scholar, noted that "the 'lack of transparency' fueled mistrust.".Universities come through in monitoring for radiation, The Seattle Times, 5 April 2011 Radioactivity in rainwater and food Radioisotopes can be concentrated by precipitation or by bioaccumulation (where plants/animals, including ultimately humans, selectively take up and concentrate particular elements). The caesium radioisotopes are potentially more dangerous than iodine-131 in the long term, because they have longer half-lives (two years for Cs-134, 30 years for Cs-137)http://www.epa.gov/rpdweb00/radionuclides/cesium.html Cesium | Radiation Protection US EPA 28 June 2006 24 April 2011 than I-131 (half-life of 8 days), so the risk of persistence in the environment and of long-term accumulation in organisms is greater. Iodine-131 can be concentrated by leafy vegetables and in milk/cheese. CRIIRAD, a French NGO, warned on 7 April that children and pregnant women in Europe should limit consumption of these, in addition to avoiding rainwater as a primary drinking source, as a precautionary measure, although it put the risk as "quite low". CRIIRAD concluded that the risk radioactive particles that remain outside the body or so called "direct fallout" was trivial.CONTAMINATION IN FRANCE. What are the risks, CRIIRAD Low levels of caesium radioisotopes were detected in China,http://news.xinhuanet.com/english2010/china/2011-04/04/c_13812901.htm Radioactive cesium detected in more Chinese regions amid Japan nuclear crisis News.xinhuanet.com 4 April 2011 24 April 2011 and in CA, USA.http://www.nuc.berkeley.edu/node/2174 UCB Milk Sampling Results | The Nuclear Engineering Department At UC Berkeley Nuc.berkeley.edu 24 April 2011 Detectable levels of radioactive isotopes in milk were present in 6 of the cities tested by the EPA in the USA, with the maximum levels reported in the city of Hilo, HI;http://www.epa.gov/japan2011/rert/radnet-sampling-data.html RadNet Laboratory Data | Japanese Nuclear Emergency: Radiation Monitoring | US EPA 24 April 2011 the levels were 24 pCi/l (0.89 Bq/l), 19 pCi/l (0.70 Bq/l) and 18 pCi/l (0.670 Bq/l) for caesium-134, caesium-137 and iodine-131 respectively. A university of Berkeley team observed a peak I-131 level of 540 picocuries per liter (20 Bq/l) in rainwater. This greatly exceeded the EPA's 3 picocurie per liter (0.1 Bq/l) standard for radioactive iodine in drinking water, although that is based on consumption of the water every day for 70 years. It is important to note that the allowed level set by regulatory agencies can vary; the levels mandated by the FDA for milk are thousands of times higher than those mandated by the EPA for water. This is partly due to different assumptions about how long the product will be consumed, and partly due to different thresholds of risk.Mcmahon, Jeff http://blogs.forbes.com/jeffmcmahon/2011/04/14/why-does-fda-tolerate-more-radiation-than-epa Why Does FDA Tolerate More Radiation Than EPA? – Jeff McMahon – The Ingenuity of the Commons – Forbes Forbes 18 April 2011 24 April 2011 As of 12 April 2011, no serious contamination had been observed of food and water produced outside Japan.Ian Sample, science correspondent http://www.guardian.co.uk/world/2011/apr/12/japan-nuclear-fukushima-radiation Radiation from Fukushima spreads, but threat to rest of world is low | World news The Guardian 24 April 2011 London 12 April 2011 Radioactive debris A marine oceanographer at the International Pacific Research Center expressed concern that current models are not adequate to predict how contaminated debris swept out of the reactor will behave.Niiler, Eric http://www.msnbc.msn.com/id/42593310/ns/technology_and_science-science/ Ocean scientists ask to monitor Japan radiation MSNBC 14 April 2011 24 April 2011 Reactions Reaction in Japan and evacuation measures thumb|A Tokyo Metropolitan Police Department Kidotai (riot police) water cannon; this type was used at Fukushima to cool the plant.http://www.asahi.com/national/update/0316/TKY201103160496.html Japanese 原発冷却へ警視庁が特殊放水車　福島第一に使用検討 17 March 2011 Asahi Shimbun Japan thumb|J-village, Naraha, where the TEPCO "base camp" has been established. A nuclear emergency was declared by the Government at 19:03 on 11 March. Initially a 2 km, then 10 km12 March 2011 at 05:14 am http://www.floridaoilspilllaw.com/reuters-government-doubles-evacuation-zone-radius-20-km Reuters: Government doubles evacuation zone radius to 20 km Floridaoilspilllaw.com 12 March 2011 24 April 2011 evacuation zone was ordered. Later Prime Minister Naoto Kan issued instructions that people within a 20 km (12 mile) zone around the plant must leave, and urged that those living between 20 km and 30 km from the site to stay indoors.Richard Black http://www.bbc.co.uk/news/world-12740843 Radiation rises at Fukushima nuclear plant BBC News 15 March 2011 15 March 2011http://en.rian.ru/world/20110315/163008635.html Japan's PM urges people to clear 20-km zone around Fukushima NPP (Update-1) | World | RIA Novosti En.rian.ru 15 March 2011 Those in the zone between 20 km and 30 km from the facility were subject to voluntary evacuation. The 20 km evacuation zone was not strictly enforced, and residents were reported to have returned to their homes to recover valuables.http://www.smartmoney.com/news/on/?story=on-20110419-000507 Japan Edano: Government Mulling Banning Entry Into 20-km Evacuation Zone Smartmoney.com 19 April 2011 24 April 2011 In an apparent change in policy, on 21 April, the Japanese government formally announced that the 20 km evacuation zone would be more strictly enforced, and that only one person per residence could return for a maximum of two hours.http://mdn.mainichi.jp/mdnnews/news/20110422p2a00m0na009000c.html Evacuees from zone around nuclear plant express dissatisfaction over home visits Mdn.mainichi.jp 12 April 2011 24 April 2011http://www3.nhk.or.jp/daily/english/22_20.html Evacuation area officially expanded .nhk.or.jp 24 April 2011 Then on 22 April, the Japanese government announced that the evacuation zone would be extended from the 20 km "circular" zone to an irregular zone extending northwest of the Fukushima site. On 16 May, the Japanese government began evacuating people from outside the official exclusion zone, including the village of Iitate, where high levels of radiation had been repeatedly measured.Japan evacuates villages outside nuclear zone, ABC News, 16 May 2011Fukushima village on way to becoming ghost town, Japan Times, 13 May 2011 The Prime Minister visited the plant for a briefing on 12 March.Kan inspects quake-hit nuclear plant in Fukushima http://english.kyodonews.jp/news/2011/03/77002.html 12 March 2011 Kyodo News 12 March 2011 He called for calm and against exaggerating the danger."Japanese nuclear plant hit by fire and third explosion", The Guardian, 15 March 2011. TEPCO established a "base camp" at J-Village, a sport training centre located in Naraha and Hirono, some 20 km South of the plant.http://www.washingtonpost.com/world/japans-nuclear-workers-get-respite-from-radiation-at-athletes-village-turned-base-camp/2011/04/01/AF1bcSFC_story.html Japan's nuclear workers get respite from radiation at athletes' village-turned-base camp 1 April 2011 The Washington Post On 30 March, the IAEA announced that 20 MBq/m2 of iodine-131 were found in samples taken from 18 to 26 March in Iitate, Fukushima, 40 km northwest of the Fukushima I reactor. The IAEA recommended expanding the evacuation area, based on its criteria of 10 MBq/m2. Secretary Edano stated the government would wait to see if the high radiation continued.Takahara Kanako Kazuaki Nagata http://search.japantimes.co.jp/cgi-bin/nn20110401a1.html High radiation found outside no-go zone Japan Times The Japan Times Ltd 1 April 2011 1 12 April 2011 On 31 March, the IAEA announced a new value of 7 MBq/m2, in samples taken from 19 to 29 March in Iitate.http://search.japantimes.co.jp/cgi-bin/nn20110402x3.html Iodine-131 level falls in Iitate, IAEA says Japan Times 2 April 2011 7 April 2011 The material decays at 8% to 9% each day. Six weeks after the crisis began, plans were announced for a large-scale study of the environmental and health effects of radioactive contamination from the nuclear plant. Academics and researchers from across Japan will work with the Fukushima Prefectural Government starting in May."Scholars eye extensive study on nuclear crisis," Tokyo Times (Japan). 16 April 2011, retrieved 2011-04-16. International reaction thumb|Evacuation flight departs Misawa. The international reaction to the nuclear accidents has been a humanitarian response to the 2011 Tōhoku earthquake and tsunami, also to those people affected by the events at Fukushima I. The response has also included the expression of concern over the developments at the reactors and the risk of escalation. The accidents have furthermore prompted re-evaluation of existing and planned national nuclear energy programs, with some commentators questioning the future of the nuclear renaissance."Nuclear renaissance threatened as Japan's reactor struggles" Bloomberg, 13 March 2011, Retrieved 14 March 2011Analysis: Nuclear renaissance could fizzle after Japan quake Reuters, 14 March 2011, Retrieved 14 March 2011Japan nuclear woes cast shadow over U.S. energy policy Reuters, published 13 March 2011, accessed 14 March 2011Nuclear winter? Quake casts new shadow on reactors MarketWatch, 14 March 2011, retrieved 14 March 2011 USA, Australia and Sweden instructed their citizens to evacuate a radius of minimum 80 km. South Korea advised to leave farther than 80 km and to have plans to evacuate by all possible means.Foreigners stream out of Tokyo Inquirer HeadlinesSeoul ready to send planes, ships to evacuate its citizens from Japan Korea Herald Spain has advised their citizens to leave an area of 120 km. Embassies of France,http://www.ft.com/cms/s/0/50c822ae-4e45-11e0-a9fa-00144feab49a.html 19 March 2011 14 March 2011 France advises citizens to leave Tokyo Financial Times UK,Britain joins countries urging their citizens to leave Tokyo|World news. The Guardian. Retrieved on 19 March 2011.Japan earthquake: Britons told to consider Tokyo exit. BBC News. Retrieved on 19 March 2011. Germany,Germany to move Japan embassy to Osaka, asks Germans to exit Tokyo. Wall Street Journal. Retrieved on 19 March 2011.German embassy in Japan moved to Osaka amid nuclear fears. Xinhua News Agency. Retrieved on 19 March 2011.Germany asks its nationals in Tokyo to leave Japan. Hindustan Times. Retrieved on 19 March 2011. Switzerland,Calmy-Rey advises Swiss to leave Japan danger areas. Swissinfo.ch (15 March 2011). Retrieved on 19 March 2011. Austria,Airlines scramble to get travelers out of Tokyo. MSNBC. Retrieved on 19 March 2011. Italy, Australia, New Zealand,Consider leaving Tokyo, NZers told. NZ Herald. Retrieved on 19 March 2011.Updated- NZers advised to consider leaving northern Japan, Tokyo|The National Business Review. Nbr.co.nz. Retrieved on 19 March 2011. Finland,Finland evacuates embassy in Tokyo as situation "uncertain". Wall Street Journal. Retrieved on 19 March 2011. Kenya,Africa Review – Kenya closes Tokyo embassy, citizens advised to leave. Africareview.com. Retrieved on 19 March 2011. IsraelMedzini, Ronen Israel calls on citizens to leave Japan http://www.ynetnews.com/articles/0,7340,L-4043767,00.html 17 March 2011 Ynetnews 17 March 2011 advised their citizens to leave even the metropolitan area of Tokyo.Foreign embassies urge relocations on Japan nuclear crisis. Bloomberg. Retrieved on 19 March 2011.More governments advising citizens to leave Tokyo. The Associated Press, Google. Retrieved on 19 March 2011. Travel to Japan is very low, but additional flights have been chartered by some countries to assist those who wish to leave. In mid-March, several nations had begun official efforts to evacuate their citizens from Japan.US evacuates nationals from Japan Travel News The World Health Organization announced its intention to conduct continuing public health studies over the next 20 years.http://www.google.com/hostednews/afp/article/ALeqM5ieUoHlvyxXFcV3Xhw25tD2TTwTnQ?docId=CNG.7e0554b2bf89d7acd100b75548bac138.b61 WHO eyes 20 year nuclear health watch in Japan 13 April 2011 AFP Casualties Major news source reporting at least 2 TEPCO employees confirmed dead from "disaster conditions" following the earthquake.http://www.dailymail.co.uk/news/article-1372787/Japan-Fukushima-nuclear-plant-months-control-2-deaths-confirmed.html Crippled Japanese nuclear plant could take months to bring under control as officials confirm deaths of two engineers at complex The Daily Mail 4 March 2011 24 April 2011 London "The two workers, aged 21 and 24, sustained multiple external injuries and were believed to have died from blood loss, TEPCO said. Their bodies were decontaminated as radiation has been spewing from the plant for three weeks."http://www.foxnews.com/world/2011/04/02/japan-nuclear-plant-owner-confirms-deaths-facility-workers-fail-contain/ Japan Nuclear Plant Owner Confirms First Deaths as Workers Fail to Contain Leak Fox News 1 February 2010 24 April 2011 45 patients were reported dead after the evacuation of a hospital in Futaba. Some of them "were suffering from dehydration because they had not eaten anything for three days".Families want answers after 45 people die following evacuation from Fukushima hospital http://mdn.mainichi.jp/mdnnews/news/20110426p2a00m0na006000c.html Mainichi Daily News 26 April 2011 29 April 2011 Reactor status summary + LegendIAEA Update on Japan Earthquake http://www.iaea.org/newscenter/news/tsunamiupdate01.html International Atomic Energy Agency 14 April 2011 14 April 2011JAIF Japan Atomic Industrial Forum http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1302830485P.pdf JAIF 14 April 2011 14 April 2011 No immediate concern Concern Severe Condition Status of Fukushima I at 14 May 12:00 JSTUnit 1Unit 2Unit 3Unit 4Unit 5Unit 6 Rated Electrical Power output (MWe) 460 784 784 784 784 1,100 Rated Thermal Power output (MWt) Status of nuclear power plants in Fukushima as of 12:30 on 16 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300252224P.pdf JAIF 16 March 2011 16 March 2011 1,380 2,381 2,381 2,381 2,381 3,293 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Containment type Mark I Mark I Mark I Mark I Mark I Mark II Core fuel assembliesCRIIRAD, PDF, TEPCO (in Japanese) 400 548 548 0 548 764 Spent fuel assembliesStatus of the Nuclear Reactors at the Fukushima I Power Plant http://www.nytimes.com/interactive/2011/03/16/world/asia/reactors-status.html 17 March 2011 The New York Times 16 March 2011 292 587 514 1,331 946 876 Spent fuel residual decay heatFederal Ministry for Environment, Nature Conservation and Nuclear Safety German Kurzübersicht aktuelle Sicherheitslage (overview of current safety status) 20 MarchMarch 2011 http://www.bmu.de/atomenergie_sicherheit/doc/47114.php 20 March 2011http://www.asahi.com/english/TKY201103190255.html Workers must cool 4,546 spent fuel rod bundles 20 March 2011 The Asahi Shimbun 20 March 2011 60 kW 400 kW 200 kW 2,000 kW 700 kW 600 kW Fuel type Low-enriched uranium Low-enriched uranium Mixed-oxide (MOX) and low-enriched uranium Low-enriched uranium Low-enriched uranium Low-enriched uranium Status at earthquake In service In service In service Outage (scheduled) Outage (scheduled) Outage (scheduled) Fuel integrity Damaged (fully meltedhttp://www.tepco.co.jp/en/press/corp-com/release/betu11_e/images/110515e10.pdf TEPCO Reactor Core Status of Fukushima Daiichi Nuclear Power Station Unit 1 May 15, 2011 May 18, 2011) Damaged (35% estimated) Damaged (30% estimated) Some spent fuel damaged Not damaged Not damaged Reactor pressure vessel integrity Damage and leakage suspectedJAIF Japan Atomic Industrial Forum http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1305354146P.pdf 14 May 2011 14 May 2011 Unknown Unknown Not damaged (defueled) Not damaged Not damaged Containment integrity Damage and leakage suspected Damage and leakage suspected Not damaged (estimation) Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary (defueled) Functional Functional Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary (defueled) Functional (in cold shutdown) Functional (in cold shutdown) Building integrity Severely damaged owing to hydrogen explosion border-bottom:3px solid gray; Slightly damaged, also panel removed to prevent hydrogen explosion border-bottom:3px solid gray; Severely damaged owing to hydrogen explosion border-bottom:3px solid gray; Severely damaged owing to hydrogen explosion border-bottom:3px solid gray; Panel removed to prevent hydrogen explosion border-bottom:3px solid gray; Panel removed to prevent hydrogen explosion border-bottom:3px solid gray; Pressure vessel, water level Lower than the bottom of fuel Fuel exposed partially or fully Fuel exposed partially or fully Safe (defueled) Safe (in cold shutdown) Safe (in cold shutdown) Pressure vessel, pressure (Two instrument trains) Stable at 0.478 MPa (absolute) (Train A) / 1.298 MPa (absolute)(Train B – suspected faultyhttp://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1305354146P.pdf Information on Status of Nuclear Power Plants in Fukushima 14 May 2011) at 13 May 11:00 JSThttp://www.nisa.meti.go.jp/english/files/en20110423-4-2.pdf Conditions of Fukushima Dai-ichi Nuclear Power Station Unit 1–6（As of 2:00 April 23rd, 2011) 23 April 2011 Stable at -0.018 MPa (absolute) (Train A) / -0.016 MPa (absolute) (Train B) at 13 May 11:00 JST Stable at -0.089 MPa (absolute) (Train A) / -0.091 MPa (absolute) (Train B) at 13 May 11:00 JST Safe (defueled) Safe (in cold shutdown) Safe (in cold shutdown) Pressure vessel, temperature (not direct measurements) Decreased to 88.3 °C on 17 Mayhttp://www.nisa.meti.go.jp/english/files/en20110423-4-2.pdf Conditions of Fukushima Dai-ichi Nuclear Power Station Unit 1–6（As of 12:20 May 17th, 2011) 17 May 2011 Slight decrease to 113.2 °C on 17 May Decreased to 133.2 °C on 17 May Safe (defueled) Safe (in cold shutdown) Safe (in cold shutdown) Containment pressure Stable at 0.1204 MPa (absolute) at 13 May 11:00 JST border-bottom:3px solid gray; Stable at 0.055 MPa (absolute) at 13 May 11:00 JST border-bottom:3px solid gray; Stable at atmospheric pressure on 13 May border-bottom:3px solid gray; Safe border-bottom:3px solid gray;) Safe border-bottom:3px solid gray; Safe border-bottom:3px solid gray; Water injection into core Seawater injection started 12 March, with freshwater injection started 25 March and continuinghttp://www.tepco.co.jp/en/press/corp-com/release/11032602-e.html Press Release (26 March 26, 2011) Plant Status of Fukushima Daiichi Nuclear Power Station (as of 10:30 am 26 Mar) (TEPCO Press Release) Tepco.co.jp 26 March 2011 Seawater injection started 14 March, with freshwater injection started 26 March and continuing Seawater injection started 13 March, with freshwater injection started 25 March and continuing Not necessary (defueled) Not necessary Not necessary Seawater injection into containment vessel Not required Not required Not required Not necessary Not necessary Not necessary Containment venting Temporarily stopped border-bottom:3px solid gray; Temporarily stopped border-bottom:3px solid gray; Temporarily stopped border-bottom:3px solid gray; Not necessary border-bottom:3px solid gray; Not necessary border-bottom:3px solid gray; Not necessary border-bottom:3px solid gray; INES (individual) Level 5 background: #f3943f;; Level 5 background: #f3943f;; Level 5 background: #f3943f;; Level 3 background: #fd0;; – – INES (combined)Level 7 Environmental effect Radiation levels: South side of office building: 0.385 mSv/hour at 13 May 21:00 JSThttp://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1305354146P.pdf Information on Status of Nuclear Power Plants in Fukushima as of 12:00 April 23rd JAIF 14 May 2011 Main gate: 0.016 mSv/hour at 13 May 21:00 JST West gate: 0.043 mSv/hour at 12 May 11:30 JST Radiation levels higher than 1000 mSv/hour were detected at the surface of water accumulating in the basement of Unit 2 and the piping tunnel outside the Unit 2 building on 27 March Plutonium was detected in small amounts in soil samples near the station on 21, 22, 25, and 28 March Radioactive iodine, caesium, ruthenium, and tellurium have been detected in seawater samples in the vicinity of the station since 21 March Levels of radioactive I-131 4,385 times higher than regulatory limits were detected in seawater samples on 30 March Levels of radioactive I-131 7.5 million times higher than regulatory limits were detected in seawater samples near the Unit 2 water intake on 2 April On 2 April, highly radioactive (over 1000 mSv/hour) water was discovered leaking from a concrete structure housing electrical cables into the sea through cracks in the concrete wall; as of 6 April, this leakage has been stopped On 4 April, the release of 10,000 tons of low-level radioactive wastewater began in order to make room for the highly radioactive water discovered on 2 April. Regarding the influence of the low level radioactive waste release, TEPCO evaluated that eating fish and seaweed caught near the plant every day for a year would add some 25% of the dose that the general public receive from the environment for a year. TEPCO and MEXT has expanded the monitoring for the surrounding sea area since 4 April. Radioactive material was detected in underground water sampled near the turbine buildings on 30 March Radioactive material has been detected in milk and agricultural products from Fukushima and neighboring prefectures, prompting government limits on shipments (21 March) and intake (23 March) for some products Radioactive iodine was found in tap water in some prefectures between 21 and 27 March, prompting government warnings not to drink the water in those regions; as of 2 April, these warnings have been lifted Levels of radioactive caesium above regulatory limits were detected in small fish caught off the coast of Ibaraki on 4 Aprilhttp://www3.nhk.or.jp/daily/english/05_34.html High level of cesium detected in sand lances .nhk.or.jp 5 April 2011 12 April 2011Evacuation radius20 km from Nuclear Power Station (NPS), but 30 km should consider leaving as of 25 March 11:30 JSThttp://www.latimes.com/news/nationworld/world/la-fgw-japan-nuclear-plant-20110326,0,5763742.story Japan steps up nuclear plant precautions; Kan apologizes 25 March 2011 L.A. Times Makinen, Julie General status from all sources regarding reactor cores Stabilized by injecting sea water and boron Stabilized by injecting sea water and boron Stabilized by injecting sea water and boron Defueled Cold shutdown on 20 March 14:30 JSThttp://www.world-nuclear-news.org/RS_Stabilisation_at_Fukushima_Daiichi_2003111.html Stabilisation at Fukushima Daiichi, update 2 World Nuclear News 20 March 2011 Cold shutdown on 20 March 19:27 JST General status from all sources regarding Spent Fuel Pools (SFP) Sprayed freshwater injection started, 23 °C on 26 April 07:30 Freshwater injection continues, 48.0 °C on 13 May 11:00 JST Sprayed freshwater injection continues, 56 °C on 26 April 07:30 Sprayed freshwater injection continues after hydrogen explosion from pool on 15 March, 29 °C on 23 April 02:00 Cooling system restored, 42.8 °C on 13 May 12:00 JST Cooling system restored, 37.5 °C on 13 May 12:00 JSTInformation sources Status of nuclear power plants in Fukushima as of 19:00 JST on 16 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300273535P.pdf JAIF 16 March 2011 16 March 2011 Status of nuclear power plants in Fukushima as of 09:00 JST on 17 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300322727P.pdf JAIF 17 March 2011 17 March 2011 Status of nuclear power plants in Fukushima as of 16:00 JST on 17 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300322727P.pdf JAIF 17 March 2011 17 March 2011 Status of nuclear power plants in Fukushima as of 22:00 JST on 17 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300368041P.pdf JAIF 17 March 2011 17 March 2011 Status of nuclear power plants in Fukushima as of 10:00 JST on 18 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300411879P.pdf http://www.webcitation.org/5xGv7zqWh 18 March 2011 JAIF 18 March 2011 18 March 2011 Status of nuclear power plants in Fukushima as of 22:00 JST on 18 March http://www.jaif.or.jp/english/aij/110318FukushimaEventStatus-14 JAIF 18 March 2011 18 March 2011 Status of nuclear power plants in Fukushima as of 10:00 JST on 19 March http://www.jaif.or.jp/english/aij/110319FukushimaEventStatus-14e.pdf JAIF 19 March 2011 19 March 2011 Status of nuclear power plants in Fukushima as of 10:00 JST on 20 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300584349P.pdf JAIF 20 March 2011 20 March 2011 Status of nuclear power plants in Fukushima as of 22:00 JST on 21 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300712524P.pdf JAIF 21 March 2011 21 March 2011 Status of nuclear power plants in Fukushima as of 21:00 JST on 22 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300796691P.pdf JAIF 22 March 2011 22 March 2011 Status of nuclear power plants in Fukushima as of 21:00 JST on 23 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300882515P.pdf JAIF 23 March 2011 23 March 2011 Status of nuclear power plants in Fukushima as of 16:00 JST on 25 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1301041730P.pdf JAIF 25 March 2011 25 March 2011 Status of nuclear power plants in Fukushima as of 21:00 JST on 25 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1301056350P.pdf JAIF 25 March 2011 25 March 2011Status of nuclear power plants in Fukushima as of 20:00 JST on 26 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1301137974P.pdf JAIF 26 March 2011 26 March 2011Status of nuclear power plants in Fukushima as of 10:00 JST on 27 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1301190694P.pdf JAIF 27 March 2011 27 March 2011Status of nuclear power plants in Fukushima as of 20:00 JST on 28 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1301311278P.pdf JAIF 28 March 2011 28 March 2011Status of nuclear power plants in Fukushima as of 20:00 JST on 29 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1301399277P.pdf JAIF 29 March 2011 29 March 2011Status of nuclear power plants in Fukushima as of 21:00 JST on 30 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1301489625P.pdf JAIF 30 March 2011 30 March 2011Status of nuclear power plants in Fukushima as of 21:00 JST on 31 March http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1301575495P.pdf JAIF 31 March 2011 31 March 2011Status of nuclear power plants in Fukushima as of 21:00 JST on 1 April http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1301659895P.pdf JAIF 1 April 2011 1 April 2011Status of nuclear power plants in Fukushima as of 18:00 JST on 2 April http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1301737920P.pdf JAIF 2 April 2011 2 April 2011Status of nuclear power plants in Fukushima as of 18:00 JST on 3 April http://www.jaif.or.jp/english/aij/member/2011/110403fukushimastatus-59e.pdf JAIF 3 April 2011 3 April 2011</ref>Status of nuclear power plants in Fukushima as of 20:00 JST on 5 April http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1302003224P.pdf JAIF 5 April 2011 5 April 2011Status of nuclear power plants in Fukushima as of 20:00 JST on 7 April http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1302175357P.pdf JAIF 7 April 2011 7 April 2011Status of nuclear power plants in Fukushima as of 20:00 JST on 8 April http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1302260293P.pdf JAIF 8 April 2011 8 April 2011 Cleanup Initially, TEPCO did not put forward a strategy to regain control of the situation in the reactors. Helmut Hirsch, a German physicist and nuclear expert, says "they are improvising with tools that were not intended for this type of situation". However, on 17 April, TEPCO appeared to put forward the broad basis of a plan which includes: (1) reaching "cold shutdown in about six to nine months;" (2) "restoring stable cooling to the reactors and spent fuel pools in about three months;" (3) putting "special covers" on units 1, 3, and 4 starting in June;TEPCO aims to achieve 'cold shutdown' for reactors in 6-9 months|Kyodo News. English.kyodonews.jp. Retrieved on 2011-04-30. (4) installing "additional storage containers for the radioactive water that has been pooling in the turbine basements and outside trenches;"TEPCO Announces a "Roadmap to Restoration" at Fukushima Dai-1 - IEEE Spectrum. Spectrum.ieee.org. Retrieved on 2011-04-30. (5) using radio-controlled equipment to clean up the site; and (6) using silt fences to limit ocean contamination. Previously, TEPCO publicly committed to installing new emergency generators 20m above sea level, twice the height of the generators destroyed by the 11 March tsunami.Clenfield, Jason. (2011-04-14) Fukushima Radiation Leaks Will Continue Through June, Tokyo Electric Says. Bloomberg. Retrieved on 2011-04-30. Toshiba and Hitachi had both proposed plans for shuttering the facility. Critics were "not fully convinced TEPCO could meet the timetable it has set for itself to achieve a cold shutdown" because the "scale and complexity of the challenge is unprecedented."Tabuchi, Hiroko Nuclear Cleanup Plans Hinge on Unknowns, NY Times, 14 April 2011 Long term plans for units 5 and 6 have not been announced, "but they too may need to be decommissioned." On 5 May, workers were able to enter reactor buildings for the first time since the accident. The workers began to install air filtration systems to clean air of radioactive materials to allow additional workers to install water cooling systems. Attempted + Legend Effective Partially effective Not effective Not applicable or unknown Solution attemptedGeneral effectivenessSpecific effectivenessReactor coresSpent fuel pools 1 2 3 4 5 6 #666 1 2 3 4 5 6Backup diesel generators The built-in backup diesel generators operated initially. All generators failed when the 14 meter tsunami overtopped tsunami walls designed for a 5.7 m tsunami. One generator repaired 17 March at units 5 and 6Battle to stabilise earthquake reactors http://www.world-nuclear-news.org/RS_Battle_to_stabilise_earthquake_reactors_1203111.html World Nuclear News 17 March 2011 to cool spent fuel pools.News Brief, 3/18/11, 10 AM EDT http://mitnse.com/2011/03/18/news-update-318/ Nuclear Science and Engineering at MIT 19 March 2011 A second on 19 March powered reactor cooling and reactors 5 and 6 were brought back to cold shutdown. #666 Backup batteries The built-in backup batteries maintained some control functions and limited cooling for 8 hours after the generators failed. Effective but only designed to work for 8 hours. The operators were unable to connect portable generators before the 8 hours ran out. Note, limited cooling was not designed to stabilise reactors indefinitely, even if batteries were recharged.Modified version of original post written by Josef Oehmen http://mitnse.com/2011/03/13/modified-version-of-original-post/ Nuclear Science and Engineering at MIT 19 March 2011 14 March 2011 #666 Mobile power units After the power loss due to the earthquake and tsunami, mobile power units were sent to the plant.Broad, William In Stricken Fuel-Cooling Pools, a Danger for the Longer Term http://www.nytimes.com/2011/03/15/world/asia/15fuel.html The New York Times 17 March 2011 Hiroko Tabuchi 14 March 2011Flooding of plant prevented mobile generators being connected and sufficiently large units were not availablecolspan="13" Some central monitoring systems #666 Repair power lines to provide electricity 1 km of new grid cable and replacement switchgear was installed to provide power to plant.Plant Status of Fukushima Daiichi Nuclear Power Station (as of 6:00 pm Mar 20th) http://www.tepco.co.jp/en/press/corp-com/release/11032009-e.html Tokyo Electric Power Company 20 March 2011Choi, Christy New Power Lines Could Help Ease Fukushima Nuke Crisis 17 March 2011 http://newsfeed.time.com/2011/03/17/new-power-lines-could-help-ease-fukushima-nuke-crisis/ 17 March 2011 TimePower was connected to the distribution panels of Units 2 and 5 on Sunday 20 March and power is now available to Units 1, 2, 5 and 6Point de situation du 19 mars 2011 à 06 heures http://www.irsn.fr/FR/Actualites_presse/Actualites/Documents/IRSN_Seisme-Japon_Point-situation-19032011-06h.pdf Institut de Radioprotection et de Surete Nucleaire 19 March 2011External power source connected to Fukushima plant's No. 1 reactor http://english.kyodonews.jp/news/2011/03/80044.html 22 March 2011 22 March 2011Power line connected to crippled nuclear plant http://www.msnbc.msn.com/id/42144350/ns/world_news-asiapacific/ 18 March 2011 18 March 2011Reactors may restore cooling systems by Sat. http://www3.nhk.or.jp/daily/english/18_18.html 18 March 2011 18 March 2011Two reactors connected to external power sources http://www3.nhk.or.jp/daily/english/19_29.html 19 March 2011Restoring external power to Fukushima Daiichi http://www3.nhk.or.jp/daily/english/21_18.html NHK World 21 March 2011 21 March 2011External power source connected to Fukushima plant's No. 1 reactor http://english.kyodonews.jp/news/2011/03/80053.html 22 March 2011 22 March 2011 but only equipment in units 5 and 6 is sufficiently repaired to function. Units 3 and 4 are scheduled to have electricity connected to their distribution panels on 22 March.Seismic Damage Information (the 39th Release) http://www.nisa.meti.go.jp/english/files/en20110321-4-1.pdf 21 March 2011colspan="13" Central control room #666 Emergency cooling systems The built-in Emergency cooling systems (ECCS) include: High Pressure Coolant Injection System (HPCI), Reactor Core Isolation Cooling System (RCIC), Automatic Depressurization System (ADS), Low Pressure Core Spray System (LPCS), Low Pressure Coolant Injection System (LPCI), Depressurization Valve System (DPVS), Passive Containment Cooling System (PCCS), and Gravity Driven Cooling System (GDCS). The RCIC operated initially and the HPCI worked until the toruses overheated. Cooling systems were restored to Units 5 and 6 on 20 March.Water temp at 2 reactors below boiling point http://www3.nhk.or.jp/daily/english/20_33.html NHK World 20 March 2011 BBC news reported on 17 March, that some of the original water pumps might be inoperable due to damage from injected sea water, the earthquake, tsunami or explosions. #666 Cooling core containment areas by adding sea water Sea water with neutron absorbing boric acid is being manually injected into the Reactor Pressure Vessel of units 1, 2 and 3 via fire extinguisher system line. Sea water cooling has been partially effective for the cooling reactor core but fuel damage has taken place. At one point available water in site pools ran out. White smoke or steam was reported rising from Unit 3. #666 Cooling core containment with fresh water and boron By 28 March, all core cooling was using fresh water rather than sea water, which is corrosive. In unit 2, neutron-absorbing boric acid was added to the water.http://articles.cnn.com/2011-03-28/world/japan.nuclear.status_1_reactor-radioactive-water-tokyo-electric CNN Damaged reactor may be leaking radioactive water, Japan says 28 March 2011 Unknown. #666 Spraying water into spent fuel pools with water cannon and fire engines Police, military and firemen working in shifts to reduce radiation exposure used water cannons and fire engines to spray water onto the roofs and into the spent fuel pools of reactor unit Number 3 although it is unclear if any water reached the spent fuel pool.Black, Richard Choppers and cannon bring no nuclear relief http://www.bbc.co.uk/news/science-environment-12773350 17 March 2011 BBC News 17 March 2011http://www.guardian.co.uk/world/blog/2011/mar/17/japan-nuclear-crisis-tsunami-aftermath#block-33 Japan nuclear crisis and tsunami aftermath – live updates The Guardian 17 March 2011 Tania Branigan Peter Walker Adam Gabbatt 17 March 2011 LondonSDF finishes spraying water on No.3 reactor http://www3.nhk.or.jp/daily/english/17_41.html 17 March 2011McCurry, Justin Japan to use water cannon at nuclear plant as international concern grows http://www.guardian.co.uk/world/2011/mar/16/japan-cool-fukushima-water-cannon 17 March 2011 The Guardian 16 March 2011 London Unit 4 was sprayed also. SFP 1: As of Saturday 19 March, SFP 1's decrease in water level suggests it may have a leak and spraying may be attempted. SFP was 60 °C on 20 March according to an infrared helicopter measurement.Point de situation du 21 mars 2011 à 15 heures http://www.irsn.fr/FR/Actualites_presse/Actualites/Documents/IRSN_Seisme-Japon_Point-situation-21032011-15h.pdf Institut de Radioprotection et de Surete Nucleaire 21 March 2011 21 March 2011 SFP 2: On 20 March, 40 tons of sea water was sprayed into unit 2. SFP was 40 °C on 20 March according to an infrared helicopter measurement. Spraying appeared to have been effective even though the building is nearly intact and there were few holes to spray water into. SFP 3: On Thursday 17 March, steam emanated from the roof of unit 3 after spraying which suggested that spraying was at least partially successful in reaching overheated spent fuel rods.Radiation levels lowered after water injection http://www3.nhk.or.jp/daily/english/18_05.html 17 March 2011 Radiation levels dropped slightly after the steam had dissipated suggesting the cooling may have been successful. SFP 3 may have a leak and reduced water holding capacity due to a previous explosion. SFP 3 was sprayed for 13 hours on 20 March using unmanned vehicles and spraying is continuing.SDF concludes dousing of No.4 reactor http://www3.nhk.or.jp/daily/english/20_31.html 20 March 201113-hour water spraying operation ends http://www3.nhk.or.jp/daily/english/20_01.html NHK World 20 March 2011Firefighters resume hosing No.3 reactor http://www3.nhk.or.jp/daily/english/20_27.html NHK World 20 March 2011 SFP was 60 °C on 20 March according to an infrared helicopter measurement. Water in SFP 4 was disappearing faster than evaporation could explain and some suspected that a hole was leaking water from that pool. Inspection during helicopter water drops indicated there was water in the pool of Unit 4; so, spraying on Friday 18 March focused on Unit 3. SFP 4 stopped boiling although it is releasing a large amount of heat due to the large amount of fuel stored there. On Sunday 20 March, SFP 4 was sprayed with 100 tons of water using unmanned vehicles. SFP was 40 °C on 20 March according to an infrared helicopter measurement. #666 Helicopter dumping of sea water into spent fuel pools Helicopters used for forest fire suppression dumped sea water onto the reactors. Strong winds prevented effective targeting of the dumped water since high radiation levels prevented the helicopters from flying low. Video appeared to show much of the water dispersing in mid-air weakening the intensity of the water to cool the overheating reactor.Fukushima Fifty 'on suicide mission' to battle N-plant meltdown send haunting messages to families... as radioactive steam pours from wrecked reactor http://www.dailymail.co.uk/news/article-1367125/Japan-tsunami-Fukushima-Fifty-suicide-mission-battle-nuclear-meltdown.html Daily Mail 17 March 2011 17 March 2011 London#666 Proposed thumb|Boric acid is airlifted to Fukushima for addition to cooling water. Boron Officials have considered insertion or targeted aerial dropping of boric acid, boronated plastic beads or boron carbide pellets into the spent fuel pools to absorb neutrons.How would you solve Fukushima? http://www.guardian.co.uk/world/blog/2011/mar/17/how-would-you-solve-fukushima The Guardian 17 March 2011 Jeffery, Simon 17 March 2011 London France flew 95 tonnes of boron to Japan on 17 March 2011France rushes 95 tonnes of boron to Japan http://www.straitstimes.com/BreakingNews/World/Story/STIStory_646202.html 18 March 2011 The Straits Times 17 March 2011 and the US has provided 9 tons.NHK, "US military playing key role in relief efforts", 29 March 2011. Neutron absorbing boric acid has been injected into the reactor cores, but is unclear if boron was included with the spraying of spent fuel pools (SFP)s. Sarcophagus On 18 March, Reuters reportedSaoshiro, Shinichi http://uk.reuters.com/article/2011/03/18/us-japan-fortimeline-march-idUKTRE72H5TG20110318 Japan weighs need to bury nuclear plant; tries to restore power Reuters 18 March 2011 18 March 2011 that Hidehiko Nishiyama, Japan's nuclear agency spokesman when asked about burying the reactors in sand and concrete, said: "That solution is in the back of our minds, but we are focused on cooling the reactors down." Considered a last-ditch effort since it would not provide cooling, such a plan would require massive reinforcement under the floor, as for the Chernobyl Nuclear Power Plant sarcophagus.http://www.telegraph.co.uk/news/worldnews/asia/japan/8392154/Japan-nuclear-crisis-scientists-consider-burying-Fukushima-in-a-Chernobyl-sarcophagus.html The Daily Telegraph Alleyne, Richard Japan nuclear crisis: scientists consider burying Fukushima in a 'Chernobyl sarcophagus' 19 March 2011 London Fabric cover An effort has been undertaken to fit the three damaged reactor buildings with fabric covers and filters to limit radiation release.http://www.abc.net.au/news/stories/2011/03/31/3178263.htm Reactor feared in meltdown, radiation spreads ABC News 30 March 2011 30 March 2011 The cost of building structures around units 1 – 4 and wrapping them with the sheets is estimated to reach 80 billion yen. On 6 April, sources told Kyodo News that a major construction firm was studying the idea, and that construction wouldn't "start until June." The plan has been criticized for potential only having "limited effects in blocking the release of radioactive substances into the environment."Radiation-shielding sheets to be installed in Sept. at earliest|Kyodo News. English.kyodonews.jp. Retrieved on 2011-04-30. On 14 May, TEPCO announced that it had begun to clear debris to create a space to install the cover over reactor building number 1.TEPCO to cover No.1 reactor building, NHK, 14 May 2011 Scope of cleanup International experts have said that a workforce in the hundreds or even thousands would take years or decades to clean up the area. John Price, a former member of the Safety Policy Unit at the UK's National Nuclear Corporation, has said that it "might be 100 years before melting fuel rods can be safely removed from Japan's Fukushima nuclear plant".http://www.abc.net.au/news/stories/2011/04/01/3179487.htm Crews 'facing 100-year battle' at Fukushima David Mark, Mark Willacy 1 April 2011 ABC News Edward Morse, a professor of nuclear engineering at the University of California, Berkeley, has said: ... there would be at least six months of emergency stabilisation, about two years of temporary remediation and up to 30 years of full-scale clean-up. Furthermore, the high levels of ground contamination at the site are raising concerns about the viability of individuals to work at the site in coming decades. However, according to BBC News, Japanese reactor maker Toshiba said it could decommission the earthquake-damaged Fukushima nuclear power plant in about 10 years, a third quicker than the American Three Mile Island plant.http://www.bbc.co.uk/news/world-asia-pacific-13023213 Japan: Minister in first tour of stricken nuclear plant BBC News 9 April 2011 12 April 2011 As a comparison, it took 11 years after the accident before the vessel for the partially melted core at Three Mile Island was first opened, with cleanup taking several more years. TEPCO announced on 17 April 2011 that it expected to have the automated cooling systems restored in the damaged reactors in about three months and have the reactors put into cold shutdown status in six months.Kyodo News, "Reactor shutdowns nine months away", Japan Times, 18 April 2011. Debris On 10 April 2011, TEPCO began using remote-controlled, unmanned heavy equipment to remove debris from around reactors 1–4. The debris and rubble, caused by hydrogen explosions at reactors 1 and 3, was impeding recovery operations both by being in the way and emitting high radioactivity. The debris will be placed into containers and kept at the plant.NHK, "TEPCO Uses Unmanned Equipment To Remove Rubble", 10 April 2011. Water The Japanese government has requested that Russia send the floating water decontamination plant Landysh to assist in processing radioactive water from the damaged reactors. Landysh was built by Russia with funding from Japan to process liquid wastes produced during the decommissioning of nuclear submarines.Russia floating nuclear waste plant ready to depart for Japan http://www.itar-tass.com/eng/level2.html?NewsID=16134586&PageNum=0 ITAR TASS 8 April 2011 11 April 2011 Administrative issues Safety record thumb|Fukushima reactor control room. The Fukushima Daiichi nuclear power complex was central to a falsified-records scandal that led to the departure of a number of senior executives of TEPCO. It also led to disclosures of previously unreported problems at the plant.http://online.wsj.com/article/SB10001424052748704396504576204461929992144.html Plant's Design, Safety Record Are Under Scrutiny 16 March 2011 Norihiko Shirouzu and Rebecca Smith The Wall Street Journal In 2002, TEPCO admitted it had falsified safety records at the No. 1 reactor at Fukushima Daiichi. As a result of the scandal and a fuel leak at Fukushima, the company had to shut down all of its 17 nuclear reactors to take responsibility.http://uk.reuters.com/assets/print?aid=UKL3E7EM23620110322 Special Report-Fuel storage, safety issues vexed Japan plant 22 March 2011 Reuters A power board distributing electricity to a reactor's temperature control valves was not examined for 11 years. Inspections did not cover devices related to cooling systems, such as water pump motors and diesel generators.20 March 2011 6:33 pm http://www.heraldsun.com.au/news/special-reports/operator-of-fukushima-nuke-plant-admitted-to-faking-repair-records/story-fn858jk3-1226024977934 Operator of Fukushima nuke plant admitted to faking repair records Herald Sun AUstralia 20 March 2011 24 April 2011 In addition to concerns from within Japan, the International Atomic Energy Agency (IAEA) has also expressed concern about the ability of Japan's nuclear plants to withstand seismic activity. At a meeting of the G8's Nuclear Safety and Security Group, held in Tokyo in 2008, an IAEA expert warned that a strong earthquake with a magnitude above 7.0 could pose a "serious problem" for Japan's nuclear power stations.http://www.physorg.com/news/2011-03-iaea-japan-nuclear-quake-wikileaks.html IAEA warned Japan over nuclear quake risk: WikiLeaks Daily Telegraph physorg.com 17 March 2011 In March 2006 the Japanese government opposed a court order to close a nuclear plant in the west part of the country over doubts about its ability to withstand an earthquake. Japan's Nuclear and Industrial Safety Agency believed it was "safe" and that "all safety analyses were appropriately conducted."Local Court Order Shutdown of Nuclear Reactor http://www.telegraph.co.uk/news/wikileaks-files/8383974/LOCAL-COURT-ORDERS-SHUTDOWN-OF-NUCLEAR-REACTOR.html US diplomatic cable, via WikiLeaks The Telegraph 15 March 2011 London Passed To Regulatory relationship with nuclear industry thumb|right|Nuclear opposition protesting following the disaster In 2010, Toru Ishida, the former director general of the Ministry of Economy, Trade and Industry (METI), which has responsibilities that include regulating nuclear industry, left the agency and joined TEPCO a few months later to become a senior adviser. He followed Susumu Shirakawa, another METI veteran who was a board member and executive vice president at TEPCO until retiring in June 2010.http://online.wsj.com/article/SB10001424052748703784004576220770999985288.html Japan Will Rebuild From Quake But Faces Other Daunting Tests 25 March 2011 John Bussey The Wall Street Journalhttp://online.wsj.com/article/SB10001424052748703696704576222340033889606.html Nuclear regulator tied to industry 28 March 2011 Yuka Hayashi The Wall Street Journal Regulatory capture may have contributed to the cascade of failures which were revealed after the tsunami receded. Regulatory capture may have also contributed to the current situation. Critics argue that the government shares blame with regulatory agency for not heeding warnings, for not ensuring the independence of the nuclear industry's oversight while encouraging the expansion of nuclear energy domestically and internationally.Kaufmann, Daniel and Veronika Penciakova http://www.brookings.edu/opinions/2011/0316_japan_disaster_kaufmann.aspx Japan's triple disaster: Governance and the earthquake, tsunami and nuclear crises Brookings Institution 17 March 2011 World media has argued that the Japanese nuclear regulatory system tends to side with and promote the nuclear industry because of amakudari (roughly translated as descent from heaven), in which senior regulators accept high paying jobs at the companies they once oversaw. To protect their potential future position in the industry, regulators seek to avoid taking positions that upset or embarrass the utilities they regulate. TEPCO's position as a the largest electrical utility in Japan led it to be the most desirable position for retiring regulators, typically the "most senior officials went to work at Tepco, while those of lower ranks ended up at smaller utilities" according to the New York Times.Culture of Complicity Tied to Stricken Nuclear Plant, NYTimes, 27 April 2011 Insurance According to Munich Re, a major reinsurer, the private insurance industry will not be significantly affected by the accidents at the Fukushima nuclear power plant.http://www.munichre.com/en/media_relations/press_releases/2011/2011_03_22_press_release.aspx estimates claims burden from earthquake in Japan at around €1.5bn Munich Re 22 March 2011 24 April 2011 Swiss Re similarly states "Coverage for nuclear facilities in Japan excludes earthquake shock, fire following earthquake and tsunami, for both physical damage and liability. Swiss Re believes that the incident at the Fukushima nuclear power plant is unlikely to result in a significant direct loss for the Property & Casualty insurance industry."Swiss Re provides estimate of its claims costs from Japan earthquake and tsunami, Swiss Re, news release, 21 March 2011 References 30em External links Webcam Fukushima nuclear power plant I Chronology of images from a webcam Schematic drawing of unit 1 reactor building Cutaway drawing of Oyster Creek BWR-2 with mark 1 containment similar to unit 1 TEPCO News Releases, Tokyo Electric Power Company NISA Information update, Nuclear and Industrial Safety Agency, the nuclear safety authority of Japan JAIF Information update, Japan Atomic International Forum JAEA Information update, Japan Atomic Energy Agency IAEA Update on Japan Earthquake, International Atomic Energy Agency Second explosion at reactor No. 3 on YouTube Navigating Fukushima: Lessons from Chernobyl, potential radiation effects, and other health impacts Nature Journal – Specials: Japan earthquake and nuclear crisis Anatomy of a meltdown, Nature FLEXPART analysis showing particle transport forecast for the northern hemisphere Radiation dose chart Monitoring of µRoentgen Radiation In Japan - Background and after the accident of Fukushima Daiichi Nuclear Power Plant -