663:(RCIC) in all 4 units was activated and ran as needed to maintain water level. At the same time, operators utilized the safety relief valve systems to keep the reactor pressures from getting too high by dumping the heat to the suppression pools. In unit 3, one seawater pump remained operational and the residual heat removal system (RHR) was started to cool the suppression pool and later brought the reactor to cold shutdown on March 12. In units 1, 2, and 4 heat removal was unavailable, so the suppression pools began heating up and on March 12, the water temperature in the pools of units 1, 2, and 4 reached 100 °C between 05:30 and 06:10
656:
13-meter-high tsunami. The tsunami caused the plant's seawater pumps, used to cool reactors, to fail. Of the plant's four reactors, three were in danger of meltdown. One external high-voltage power line still functioned, allowing plant staff in the central control room to monitor data on internal reactor temperatures and water levels. 2,000 employees of the plant worked to stabilize the reactors. Some employees connected over 9 kilometers of cabling using 200-meter sections of cable, each weighing more than a ton, from their Rad Waste
Building to other locations onsite.
602:
750:, were permitted to return during daylight hours only, but others were ordered to remain away. The area did not become seriously contaminated and was safe to visit without protective clothing. In 2015, the evacuation order for Naraha was completely lifted, allowing residents to return and reconstruction efforts to begin. Naraha is the first of a number of towns in the area to have had its evacuation order removed.
2649:
874:
3197:
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49:
846:
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683:(MUPF) systems were also used to try to cool the suppression pool and drywell in addition to the reactor to prevent the drywell pressure from getting too high. Operators were later able to restore the High Pressure Core Spray portion of the ECCS in unit 4 and switched emergency water injection for unit 4 from the MUWC system to the HPCS.
679:(MUWC) system to maintain water level which was an accident mitigation method TEPCO put in place at all its nuclear plants. The system was started and stopped in all 4 units, including unit 3, as needed to maintain the water level. The RCICs in each unit later shut down due to low reactor pressure. The MUWC and the
2877:
725:
Officials made preparations for release of pressure from the plant on March 12, but no pressure release was necessary. An evacuation order was issued to the people living within 3 kilometres (1.9 mi) of the plant, subsequently expanded to 10 km (6.2 mi). Air traffic was restricted in
686:
While the water level was maintained in the three cores using emergency water injection, pressures in the containment vessel continued to rise due to lack of suppression pool cooling and the operators prepared to vent the containments making restoration of heat removal urgent. Unit 1 was prioritized
733:
As of June 2011, 7,000 tons of seawater from the tsunami remained in the plant. The plant planned to release it all back into the ocean, as the tanks and structures holding the water were beginning to corrode. Approximately 3,000 tons of the water was found to contain radioactive substances, and
670:
Operators had to also prepare an alternate injection line for each unit, as the RCIC can run indefinitely only while there is sufficient pressure and steam in the reactor to drive its turbine. Once the reactor pressure drops below a certain level, the RCIC shuts down automatically. The normal
655:
that followed the earthquake and inundated the plant was initially estimated by TEPCO to be 14 meters high, which would have been more than twice the designed height. Other sources give the tsunami height at
Fukushima Daini plant at 9-meter-high, while the Fukushima Daiichi plant was hit by a
742:
On
December 26, 2011, the Prime Minister officially cancelled the nuclear emergency declaration for the Fukushima Daini plant officially ending the incident. On February 8, 2012, the plant was opened to news media for the first time since the 2011 Tōhoku earthquake and tsunami.
392:, approximately 12 km (7.5 mi) to the north, suffered extensive damage, the Daini Plant was back under control within two days, reaching cold shutdown. The plant has not been operating since, and in July 2019 a decision to decommission the plant was made.
695:
The ultimate heat sink was restored on March 13 when the service seawater system pumps in the pump room were repaired in units 1, 2 and 4. This allowed the restoration of the normal ECCS and heat removal systems to operable status and cooling was switched to the
1515:
Japanese authorities have assessed that the loss of cooling functions in the reactor Units 1, 2 and 4 of the
Fukushima Daini nuclear power plant has also been rated as 3. All reactor Units at Fukushima Daini nuclear power plant are now in a cold shut down
2872:
2862:
587:
In
January 1989, an impeller blade on one of the reactor coolant pumps in Unit 3 broke at a weld, causing a large amount of metal debris to flow throughout the primary loop. As a result, the reactor was shut down for a considerable length of time.
675:(ECCS) were for the most part unavailable due to the loss of the ultimate heat sink and damage to some of the electrical infrastructure. Operators prepared for this and set up an alternate injection line using a non-emergency system known as the
3098:
3114:
2819:
3078:
648:) immediately after the earthquake, and the diesel engines were started to power the reactor cooling. A worker died of injuries from the earthquake when he was trapped in the crane operating console of the exhaust stack.
821:
On 31 July 2019, the TEPCO board of directors decided to decommission the plant, in response to local demands for a decision. Decommissioning is expected to take more than 40 years to complete, and will include moving
2929:
778:. 14 people were injured and more than 1,900 homes briefly lost electricity. Though a warning of a possible tsunami of 3 m (9.8 ft) in height was issued, a 60 cm (24 in) wave was reported by
3001:
2802:
340:
2699:
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700:(RHR) portion of the ECCS. The RHR systems were first activated to cool down the suppression pools (torus) and drywells to operable status, and water injections were made to the reactors using the
2814:
715:). Reactors 1 and 3 followed at 1:24 and 3:52 on March 14 and Reactor 4 at 7:00 on March 15. By March 15, all four reactors of Fukushima II reached cold shutdown, which remained non-threatening.
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2884:
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704:(LPCI) mode as needed. When the suppression pool was cooled down to below 100 °C, the RHR was switched to the shutdown cooling mode and brought the reactors to a cold shutdown.
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resulted in maximum horizontal ground accelerations of 0.21 g (2.10 m/s) to 0.28 (2.77 m/s) at the plant site, which is well below the design basis. The
2685:
2845:
1433:
3239:
730:. These zones were later superseded by the 20 km evacuation and 30 km no-fly zones around Fukushima Daiichi on March 12 and 15, respectively.
948:
1194:"The record of the earthquake intensity observed at Fukushima Daiichi Nuclear Power Station and Fukushima Daini Nuclear Power Station (Interim Report)"
303:
1314:
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3144:
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902:
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389:
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31:
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1982:
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1950:
912:
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1216:
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The evacuation order was partly rescinded for Daini evacuees in August 2012. Some of the residents, such as the 7200 at
374:
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644:(4.15 m/s) and 0.52 g (5.12 m/s) and for a tsunami was 5.2 m. All four units were automatically shut down (
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799:
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1998:
1529:"Japan nuclear safety agency says level 5 incident at Fukushima reactors No. 1, 2, 3, raised from level 4"
887:
1729:
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1318:
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207:
141:
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Japan invokes 30km no-fly zone around
Fukushima plant; more flights to north-east - Update 4 | CAPA
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later reported the restart of the spent fuel cooling system after only 100 minutes of stoppage.
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2009:
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The
Fukushima Daini plant is connected to the rest of the power grid by the Tomioka Line (
262:
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1115:
615:
Please help update this article to reflect recent events or newly available information.
2582:
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802:
734:
Japan's
Fisheries Agency refused permission to release that water back into the ocean.
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2014:
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at a depth of 11.3 km (7.0 mi). The shock had a maximum intensity of VII
1638:
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718:
The loss of cooling water at reactors 1, 2 and 4 was classified a level 3 on the
404:
type with electric power of 1,100 MW each (net output: 1,067 MW each).
1963:
H2O-project: Extensive information about the events during and after the tsunami
1793:
1703:
1825:
17:
1694:
841:
809:
cooling systems at
Fukushima Daini had stopped as a result of the earthquake;
1801:
101:
88:
1856:
1786:"Tsunami warning for Japan's Fukushima coast after 6.9-magnitude earthquake"
873:
48:
1548:"東北太平洋沖地震による福島第一原子力発電所及び福島第二原子力発電所の事故・トラブルに対するＩＮＥＳ（国際原子力・放射線事象評価尺度）の適用について"
1094:
711:) were reached in reactor 2 about 34 hours after the emergency shut down (
2910:
1967:
255:
667:, removing the ability to remove pressure from the reactor and drywell.
2420:
2415:
794:; and another wave 1 m (3 ft 3 in) in height struck the
783:
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467:
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1550:(Press release) (in Japanese). Ministry of Economy, Trade and Industry
1434:"Cooling system fails at 3 reactors at another Japanese nuclear plant"
1059:. Council for Security Cooperation in the Asia Pacific. Archived from
312:
2295:
475:
416:
951:. Nuclear Engineering International. March 11, 2011. Archived from
726:
a 10 km (6.2 mi) radius around the plant, according to a
293:
1757:"Strong Japan Earthquake Produces Tsunami but Spares Major Damage"
974:
Gulati, Ranjay; Casto, Charles; Krontiris, Charlotte (July 2014).
763:
727:
712:
645:
385:
1031:
2681:
1971:
1957:
1719:. World-nuclear-news.org (2012-09-04). Retrieved on 2013-09-06.
1447:"Chronology of Events at Fukushima Daini nuclear power station"
779:
595:
1946:
722:(serious incident) by Japanese authorities as of March 18.
1916:
400:
All reactors in the
Fukushima II Nuclear Power Plant are
1927:
Official site c/o Tokyo Electric Company 東京電力・福島第一原子力発電所
357:
located on a 150 ha (370-acre) site in the town of
1570:"RPT-TEPCO releasing pressure at one Fukushima reactor"
1546:
Nuclear and Industry Safety Agency (March 18, 2011).
949:"Japan initiates emergency protocol after earthquake"
1006:"Tepco declares Fukushima Daini for decommissioning"
908:
Lists of nuclear disasters and radioactive incidents
574:) to the Shin-Fukushima (New Fukushima) substation.
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1621:"Battle to stabilise earthquake reactors, update 2"
299:
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213:
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125:
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41:
1464:"All Fukushima No.2 plant reactors safely halted"
3245:Buildings and structures in Fukushima Prefecture
1281::"We sincerely pray for the repose of his soul."
407:The reactors for units 1 and 3 were supplied by
1820:
1818:
1685:. Centre for Aviation. Retrieved on 2013-09-06.
933:Text and answers to the Fukushima II plant quiz
334:
1922:Webcam showing Fukushima I Nuclear Power Plant
1826:"Japan earthquake sparks tsunami at Fukushima"
1000:
998:
943:
941:
569:
328:
2693:
1983:
1779:
1777:
1217:"Insight to Fukushima engineering challenges"
8:
3201:Nuclear power in Japan, section Seismicity
3196:
3170:
2991:
2721:
2700:
2686:
2678:
2372:
2039:
2029:
1990:
1976:
1968:
1884:"Seismic activity continues off Fukushima"
1051:
1049:
766:37 km (23 mi) east southeast of
38:
1585:"Battle to stabilise earthquake reactors"
1482:"3 Week Update on Japan's Nuclear Crisis"
1371:Fukushima No. 2 plant was 'near meltdown'
1852:"TEPCO to study cooling system stoppage"
1651:Smoke from Fukushima Daini nuclear plant
1384:
1382:
1380:
1378:
1211:
1209:
1207:
1162:
1160:
1158:
977:"How the Other Fukushima Plant Survived"
707:Coolant temperatures below 100 °C (
687:as it had the highest drywell pressure.
429:
2383:Japanese Atomic Energy Commission(JAEC)
1699:Fishermen to Tepco: Don't release water
1240:
1238:
1084:. Tepco.co.jp. Retrieved on 2013-09-06.
1057:"Nuclear Reactor Maps: Fukushima-Daini"
924:
681:makeup water purification and filtering
384:, the four reactors at Fukushima Daini
304:Related media on Commons
3230:Former nuclear power stations in Japan
2820:Leaks and dumping of radioactive water
1662:"Pilot information for Sendai Airport"
53:The Fukushima II NPP, pictured in 2015
1623:. World Nuclear News. March 12, 2010.
1583:World Nuclear News (March 12, 2011).
1423:of Tokyo Electric, received 11:50 JST
903:List of nuclear power plants in Japan
796:Fukushima Daiichi Nuclear Power Plant
790:; a 90 cm (35 in) wave hit
661:reactor core isolation cooling system
390:Fukushima Daiichi Nuclear Power Plant
32:Fukushima Daiichi Nuclear Power Plant
7:
2660:
1717:Restoration plans for Fukushima area
1436:USA Today, March 11, 2011, 6:01 EST.
1394:, World Nuclear News, March 14, 2011
1890:. November 23, 2016. Archived from
1860:. November 22, 2016. Archived from
1784:Fifield, Anna (November 22, 2016).
1755:Breslin, Sean (November 22, 2016).
1008:. World Nuclear News. July 31, 2019
640:for an earthquake was between 0.42
324:Fukushima Daini Nuclear Power Plant
42:Fukushima Daini Nuclear Power Plant
3240:Fukushima Daiichi nuclear disaster
3130:Japan Trench Fast Drilling Project
2732:Fukushima Daiichi nuclear disaster
2709:2011 Tōhoku earthquake and tsunami
1951:International Atomic Energy Agency
1313:The Sankei News (March 12, 2011).
1168:"Fukushima faced 14-metre tsunami"
913:List of civilian nuclear accidents
893:Fukushima Daiichi nuclear disaster
382:2011 Tōhoku earthquake and tsunami
25:
3208:Nuclear and radioactive incidents
2452:Japan Atomic Energy Agency (JAEA)
2388:Nuclear Regulation Authority(NRA)
1917:Tokyo Electric Power Company 東京電力
1730:"M6.9 - 37km ESE of Namie, Japan"
1504:"IAEA Update on Japan Earthquake"
1391:Cold shutdowns at Fukushima Daini
1369:2012-02-09 Ver.13S page 1&2,
1246:"IAEA update on Japan Earthquake"
758:On Tuesday, November 22, 2016, a
720:International Nuclear Event Scale
3195:
3169:
2659:
2648:
2647:
2474:Japan Electric Association(JEA)
2285:prototype fast (breeder) reactor
1466:. March 15, 2011. Archived from
1097:. Nuketext.org. October 28, 2008
872:
858:
844:
600:
199:Nuclear power station
47:
3182:Seismicity of the Sanriku coast
1734:United States Geological Survey
898:List of boiling water reactors
805:said that the third reactor's
702:Low Pressure Coolant Injection
673:Emergency Core Cooling Systems
419:while the unit 4 was built by
1:
3235:1970s establishments in Japan
3115:Impact on video game industry
2916:Sayonara Nuclear Power Plants
2625:Sayonara Nuclear Power Plants
3250:Tokyo Electric Power Company
2841:Okawa School tsunami tragedy
1937:Tokyo Electric Power Company
1291:asahi.com (March 12, 2011).
698:Residual Heat Removal System
375:Tokyo Electric Power Company
193:Tokyo Electric Power Company
161:September 30, 2019
27:Nuclear power plant in Japan
3028:Yuzuru Hanyu Notte Stellata
2516:Tokaimura nuclear accidents
1340:ANN News (March 12, 2011).
592:2011 earthquake and tsunami
415:. Units 1–3 were built by
411:, and for units 2 and 4 by
335:
273:Annual net output
3266:
2906:Project Sunshine for Japan
2593:Project Sunshine for Japan
2511:Fukushima nuclear disaster
2431:Japan Nuclear Fuel Limited
1572:. Reuters. March 11, 2011.
1315:"東電、協力会社社員３人死亡 ２人不明 福島と茨城"
1293:"福島第二原発で作業員１人死亡 第一では２人が不明"
1137:"Wise News Communique 342"
1135:WISE (November 23, 1990).
798:site after the 6.9 shock.
29:
3163:
2643:
2005:
866:Nuclear technology portal
609:This section needs to be
570:
388:. While the sister plant
348:) Genshiryoku Hatsudensho
329:
309:
236:
232:
58:
46:
3008:Operation Pacific Assist
2553:Japanese Communist Party
2521:Mihama nuclear accidents
1609:. TEPCO. March 13, 2011.
1342:"【地震】第二原発 閉じ込められた従業員は死亡"
1267:TEPCO (March 12, 2011).
1116:Tepco Annual Report 2003
760:magnitude 6.9 earthquake
377:(TEPCO) runs the plant.
146:April 20, 1982
129:March 16, 1976
30:Not to be confused with
2972:(7.1, 13 February 2021)
2966:(6.9, 22 November 2016)
2630:Social Democratic Party
2478:membership organization
1028:"Reactors in operation"
982:Harvard Business Review
931:Tepco site (Japanese).
800:Chief Cabinet Secretary
677:Makeup Water Condensate
386:automatically shut down
351:, Fukushima II NPP, 2F)
250:Nameplate capacity
126:Construction began
3140:869 Sanriku earthquake
2960:(7.3, 7 December 2012)
2426:Mitsubishi FBR Systems
1999:Nuclear power in Japan
1139:. WISE. Archived from
1125:. Page 24. (Japanese).
1121:April 3, 2012, at the
888:Nuclear power in Japan
634:2011 Tōhoku earthquake
564:Electrical connections
241:Units operational
158:Decommission date
102:37.31639°N 141.02556°E
3023:Reconstruction Agency
3002:Humanitarian response
2759:Fukushima Daini plant
2445:Research institutions
2355:research fast reactor
1933:"TEPCO News Releases"
1707:, June 9, 2011, p. 1.
1082:福島第二原子力発電所 設備の概要｜東京電力
638:design basis accident
228:Power generation
214:Reactor supplier
3175:Japanese earthquakes
3145:2011 local elections
2978:(7.0, 20 March 2021)
2954:(6.6, 11 April 2011)
1894:on November 24, 2016
1864:on November 24, 2016
1587:. World Nuclear News
1063:on February 15, 2005
772:Fukushima Prefecture
671:electrically driven
371:Fukushima Prefecture
263:Capacity factor
142:Commission date
3015:Operation Tomodachi
2948:(7.1, 7 April 2011)
2942:(7.3, 9 March 2011)
1832:. November 22, 2016
1790:The Washington Post
1761:The Weather Channel
1736:. November 21, 2016
1635:"NHK WORLD English"
1533:The Huffington Post
1034:. December 31, 2009
355:nuclear power plant
285:External links
107:37.31639; 141.02556
98: /
3120:No.18 Kyotoku-maru
3044:Wrestling in Japan
2788:Sequence of events
2328:Under construction
2103:Kashiwazaki-Kariwa
1958:All Things Nuclear
1607:"Press release 11"
1470:on March 18, 2011.
1221:World Nuclear News
1172:World Nuclear News
824:spent nuclear fuel
659:The steam-powered
439:Installation costs
436:First criticality
3217:
3216:
3150:Miracle Pine Tree
3062:
3061:
2924:
2923:
2815:Radiation effects
2774:Higashidori plant
2675:
2674:
2614:Rokkasho Rhapsody
2598:Reiwa Shinsengumi
2588:Kiyoshiro Imawano
2526:List of incidents
2499:
2498:
2376:Regulatory bodies
2364:
2363:
2257:
2256:
2093:Fukushima Daiichi
1348:on March 15, 2011
1321:on March 23, 2011
1143:on March 26, 2012
955:on March 14, 2011
630:
629:
561:
560:
444:Reactor supplier
441:(million yen/MW)
336:Fukushima Daini (
320:
319:
244:4 × 1,100 MW
204:Reactor type
16:(Redirected from
3257:
3199:
3198:
3189:List of tsunamis
3173:
3172:
3155:Shinkansen Relay
2992:
2970:Fukushima, Japan
2964:Fukushima, Japan
2952:Fukushima, Japan
2722:
2702:
2695:
2688:
2679:
2663:
2662:
2651:
2650:
2635:Jinzaburo Takagi
2620:Ryuichi Sakamoto
2568:Mizuho Fukushima
2558:Genpatsu-shinsai
2373:
2040:
2030:
1992:
1985:
1978:
1969:
1954:
1947:"IAEA Alert Log"
1940:
1904:
1903:
1901:
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1874:
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1669:
1664:. March 12, 2011
1658:
1652:
1650:
1648:
1646:
1641:on April 2, 2011
1637:. Archived from
1631:
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1432:Winter, Michael
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1317:. Archived from
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2856:Fukushima 50
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2725:Power plants
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2608:Kenzaburō Ōe
2563:Greens Japan
2545:
2536:Anti-nuclear
2489:reprocessing
2097:
1898:November 23,
1896:. Retrieved
1892:the original
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3037:Fundraisers
2932:Aftershocks
2930:Foreshocks,
2764:Tōkai plant
2459:(abolished)
2394:Japan's NSC
2319:Namie-Odaka
2075:Higashidōri
1794:Naha, Japan
1704:Japan Times
1516:condition..
830:to on-site
738:Restoration
536:17/12/1986
513:14/12/1984
488:23/06/1983
461:31/07/1981
396:Description
189:Operator(s)
105: /
81:Coordinates
3224:Categories
3168:See also:
2986:Relief and
2885:Comparison
2878:Government
2846:Casualties
2799:reactions
1695:Kyodo News
1095:"原発の発電コスト"
919:References
621:March 2017
380:After the
330:福島第二原子力発電所
165:2019-09-30
150:1982-04-20
133:1976-03-16
93:141°1′32″E
90:37°18′59″N
3049:Hong Kong
2899:Movements
2825:Aftermath
2752:Units 4-6
2718:accidents
2504:Accidents
2409:Companies
2392:formerly
2033:(Active)
1888:NHK World
1857:NHK World
1802:0190-8286
1668:March 12,
1645:March 30,
1591:March 12,
1554:March 18,
1509:March 16,
1421:reactor 4
1417:reactor 2
1413:reactor 1
1398:March 14,
1352:March 20,
1325:March 20,
1298:March 20,
1275:March 12,
1252:March 12,
1227:March 19,
1178:March 24,
1101:March 16,
1067:March 14,
1038:March 12,
987:March 16,
959:March 11,
935:. Page 8.
294:Home page
3099:TV drama
2988:Recovery
2911:Safecast
2808:Japanese
2795:Timeline
2654:Category
2538:movement
2484:Rokkasho
2307:Canceled
2244:Tōkai II
2167:Takahama
2131:Hokuriku
2044:Hokkaido
2025:Reactors
1830:BBC News
1488:April 2,
1452:. TEPCO.
1119:Archived
1012:July 31,
838:See also
553:Takenaka
545:Hitachi
542:Hitachi
522:Toshiba
519:Toshiba
499:Hitachi
472:Toshiba
425:Takenaka
173:Owner(s)
71:Location
2995:Efforts
2851:Cleanup
2716:Nuclear
2666:Commons
2421:Toshiba
2416:Hitachi
2291:Tōkai I
2249:Tsuruga
2195:Shikoku
2185:Shimane
2177:Chugoku
2121:Hamaoka
2070:Onagawa
1271:. TEPCO
1147:July 4,
784:Onahama
762:struck
653:tsunami
611:updated
549:Shimizu
525:Kajima
502:Kajima
495:Hitachi
480:Mark 2
468:Toshiba
421:Shimizu
413:Hitachi
409:Toshiba
365:in the
363:Tomioka
300:Commons
290:Website
222:Hitachi
218:Toshiba
163: (
148: (
131: (
63:Country
3054:Taiwan
2834:Topics
2747:Unit 3
2742:Unit 2
2737:Unit 1
2296:Magnox
2262:Closed
2226:Genkai
2221:Sendai
2213:Kyushu
2162:Mihama
2149:Kansai
2062:Tohoku
2052:Tomari
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1419:, and
748:Naraha
578:Events
476:Kajima
417:Kajima
359:Naraha
254:4,400
118:Status
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3108:Other
3094:Books
3089:Manga
3084:Songs
3074:Films
2467:Other
2457:Dōnen
2344:Other
2281:Monju
2269:Fugen
2203:Ikata
2139:Shika
2113:Chubu
2085:TEPCO
1450:(PDF)
1198:TEPCO
826:from
811:TEPCO
768:Namie
764:Japan
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646:scram
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180:TEPCO
66:Japan
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2396:and
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1798:ISSN
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