Fukushima Daiichi Nuclear Power Plant

Fukushima Daiichi Nuclear Power Plant
Not to be confused with Fukushima Daini Nuclear Power Plant.
See also: Fukushima Daiichi nuclear disaster
Fukushima Daiichi Nuclear Power Plant

The Fukushima Daiichi NPP in 2002
Fukushima Daiichi Nuclear Power Plant is located in Japan
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Location of Fukushima Daiichi Nuclear Power Plant
Country Japan
Location Ōkuma, Fukushima
Coordinates 37°25′22.7″N 141°01′58.5″E / 37.422972°N 141.032917°E / 37.422972; 141.032917Coordinates: 37°25′22.7″N 141°01′58.5″E / 37.422972°N 141.032917°E / 37.422972; 141.032917
Status Units 1-4: Severely damaged, decommissioned
Units 5-6: Slightly damaged, out of service
Construction began July 25, 1967 (1967-07-25)
Commission date March 26, 1971 (1971-03-26)
Operator(s) Tokyo Electric Power Company
Constructor(s) Kajima
Reactor information
Reactors operational 1 × 460 MWe (Unit 1 damaged)
4 × 784 MWe (Units 2, 3, and 4 damaged; Unit 5 experiencing cooling problems)
1 × 1,100 MWe (Unit 6 experiencing cooling problems)
Reactors planned 2 × 1,380 MWe
Reactor type(s) Boiling Water Reactor
Reactor supplier(s) General Electric
Toshiba
Hitachi
Power generation information
Installed capacity 4,696 MW
Maximum capacity 7,456 MW
Annual generation 29,891 GW·h
Net generation 877,692 GW·h
Website
http://www.tepco.co.jp/en/nu/press/f1-np/index-e.html
As of March 14, 2011
Webcam

The Fukushima I Nuclear Power Plant (福島第一原子力発電所 Fukushima Dai-ichi (About this sound pronunciation) Genshiryoku Hatsudensho?, Fukushima I NPP), also known as Fukushima Dai-ichi (dai-ichi means "number one"), is a disabled nuclear power plant located on a 3.5-square-kilometre (860-acre) site[1] in the towns of Okuma and Futaba in the Futaba District of Fukushima Prefecture, Japan. First commissioned in 1971, the plant consists of six boiling water reactors (BWR). These light water reactors[2] drove electrical generators with a combined power of 4.7 GWe, making Fukushima Daiichi one of the 15 largest nuclear power stations in the world. Fukushima I was the first nuclear plant to be constructed and run entirely by the Tokyo Electric Power Company (TEPCO).[3] The plant suffered major damage from the 9.0 earthquake and subsequent tsunami that hit Japan on March 11, 2011 and is not expected to reopen. The earthquake and tsunami disabled the reactor cooling systems, leading to nuclear radiation leaks and triggering a 30 km evacuation zone surrounding the plant. On April 20, 2011, the Japanese authorities declared the 20 km evacuation zone a no-go area which may only be entered under government supervision.

The Fukushima II Nuclear Power Plant, or Fukushima Dai-ni, is located to the south and also run by TEPCO.

Contents

Power plant information

Cross-section sketch of a typical BWR Mark I containment, as used in Units 1 to 5. The reactor core (1) consists of fuel rods and moderator rods (39) which are moved in and out by the device (31). Around the pressure vessel (8), there is an outer containment (19) which is closed by a concrete plug (2). When fuel rods are moved in or out, the crane (26) will move this plug to the pool for facilities (3). Steam from the dry well (11) can move to the wet well (24) through jet nozzles (14) to condense there (18). In the spent fuel pool (5), the used fuel rods (27) are stored. .

The reactors for Units 1, 2, and 6 were supplied by General Electric, those for Units 3 and 5 by Toshiba, and Unit 4 by Hitachi. All six reactors were designed by General Electric.[4][5] Architectural design for General Electric's units was done by Ebasco. All construction was done by Kajima.[6] Since September 2010, Unit 3 has been fueled by a small fraction (6%)[7] of mixed-oxide (MOX) fuel, rather than the low enriched uranium (LEU) used in the other reactors.[8][9] Units 1–5 were built with Mark I type (light bulb torus) containment structures.[10][11] The Mark I containment structure was slightly increased in volume by Japanese engineers.[12] Unit 6 has a Mark II type (over/under) containment structure.[10][11][13]

Unit 1 is a 460 MW boiling water reactor (BWR-3) constructed in July 1967. It commenced commercial electrical production on March 26, 1971, and was initially scheduled for shutdown in early 2011.[14] In February 2011, Japanese regulators granted an extension of ten years for the continued operation of the reactor.[15] It was damaged during the 2011 Tōhoku earthquake and tsunami.[16]

Unit 1 was designed for a peak ground acceleration of 0.18 g (1.74 m/s2) and a response spectrum based on the 1952 Kern County earthquake, but rated for 0.498 g.[10][17] The design basis for Units 3 and 6 were 0.45 g (4.41 m/s2) and 0.46 g (4.48 m/s2) respectively.[18] All units were inspected after the 1978 Miyagi earthquake when the ground acceleration was 0.125 g (1.22 m/s2) for 30 seconds, but no damage to the critical parts of the reactor was discovered.[10] The design basis for tsunamis was 5.7 meters.[19]

The reactor's emergency diesel generators and DC batteries, crucial components in helping keep the reactors cool in the event of a power loss, were located in the basements of the reactor turbine buildings. The reactor design plans provided by General Electric specified placing the generators and batteries in that location, but mid-level engineers working on the construction of the plant were concerned that this made the back up power systems vulnerable to flooding. TEPCO elected to strictly follow General Electric's design in the construction of the reactors.[20]

Site layout

The location of the plant was on a bluff which was originally 35-meters above sea level. During construction, however, TEPCO lowered the height of the bluff by 25-meters. One reason the bluff was lowered was so that the base of the reactors could be constructed on solid bedrock to mitigate the threat posed by earthquakes. Another reason was the lowered height would keep the running costs of the seawater pumps low. TEPCO did not factor in the tsunami risk when planning the site's construction. Therefore, the lowered height would result in the plant being more vulnerable to tsunami.[21]

The Fukushima Daiichi site is divided into two reactor groups, the leftmost group when viewing from the ocean contains units 4,3,2 and 1 going from left to right. The rightmost group when viewing from the ocean contains the newer units 5 and 6, respectively the positions from left to right. A set of seawalls protrude into the ocean, with the water intake in the middle and water discharge outlets on either side.

  • Aerial view of the Fukushima I plant area in 1975, showing sea walls and completed reactors

  • Closeup of Units 4,3,2 and 1.

  • Major buildings

  • Illustration of post-accident state of 1-4 reactors, all but 2 display obvious damage to secondary containment

Reactor data

Units 7 and 8 were planned to start construction in April 2012 and 2013 and to come into operation in October 2016 and 2017 respectively. The project was formally canceled by TEPCO in April 2011 after local authorities questioned the fact that they were still included in the supply plan for 2011, released in March 2011, after the accidents. The company stated that the plan had been drafted before the earthquake.[22]

Unit Type[23] Containment Start construction[24] First criticality[24] Commercial operation[24] Electric power[24] Reactor supplier[23] Architecture[6] Construction[6] Fuel
Fukushima I – 1 BWR-3 Mark I July 25, 1967 October 10, 1970 March 26, 1971 460 MW General Electric Ebasco Kajima LEU
Fukushima I – 2 BWR-4 Mark I June 9, 1969 May 10, 1973 July 18, 1974 784 MW General Electric Ebasco Kajima LEU
Fukushima I – 3 BWR-4 Mark I December 28, 1970 September 6, 1974 March 27, 1976 784 MW Toshiba Toshiba Kajima LEU/MOX[8]
Fukushima I – 4 BWR-4 Mark I February 12, 1973 January 28, 1978 October 12, 1978 784 MW Hitachi Hitachi Kajima
Fukushima I – 5 BWR-4 Mark I May 22, 1972 August 26, 1977 April 18, 1978 784 MW Toshiba Toshiba Kajima
Fukushima I – 6 BWR-5 Mark II October 26, 1973 March 9, 1979 October 24, 1979 1,100 MW General Electric Ebasco Kajima
Fukushima I – 7 (planned)[25] ABWR Canceled 04/2011 (As originally planned) October 2016 1,380 MW Canceled 04/2011
Fukushima I – 8 (planned)[25] ABWR Canceled 04/2011 (As originally planned) October 2017 1,380 MW Canceled 04/2011

Electrical connections

The Fukushima Daiichi plant is connected to the power grid by four lines, the 500 kV Futaba Line (双葉線), the two 275 kV Ōkuma Lines (大熊線) and the 66 kV Yonomori line (夜の森線) to the Shin-Fukushima (New Fukushima) substation.

The Shin-Fukushima substation also connects to the Fukushima Daini plant by the Tomioka Line (富岡線). Its major connection to the north is the Iwaki Line (いわき幹線), which is owned by Tohoku Electric Power. It has two connections to the south-west that connect it to the Shin-Iwaki substation (新いわき).

Operating history

The plant reactors came online from 1970 through 1979. From the end of 2002 through 2005, the reactors were among those shut down for a time for safety checks due to the TEPCO data falsification scandal.[26][27] On Feb 28, 2011 TEPCO submitted a report to the Japanese Nuclear and Industrial Safety Agency admitting that the company had previously submitted fake inspection and repair reports. The report revealed that TEPCO failed to inspect more than 30 technical components of the six reactors, including power boards for the reactor's temperature control valves, as well as components of cooling systems such as water pump motors and emergency power diesel generators.[28] In 2008, the IAEA warned Japan that the Fukushima was built using outdated safety guidelines, and could be a "serious problem" during a large earthquake.[29] The warning led to the building of an emergency response center in 2010, used during the response to the 2011 nuclear accident.[29][30]

On 4 April 2011, TEPCO vice president Takashi Fujimoto announced that the company was canceling plans to build Reactors No. 7 and 8.[31][32] On May 20 TEPCO's board of directors' officially voted to decommission Units 1 through 4 of the Fukushima Daiichi nuclear power plant and to cancel plans to build units 7 and 8. It refused however to make a decision regarding units 5 and 6 of the station or units 1 to 4 of the Fukushima Daini nuclear power station until a detailed investigation is made. It said in the interim it will work to preserve these reactors in the state of cold shutdown.

Warnings and design critique

In 1990 the US Nuclear Regulatory Commission (NRC) ranked the failure of the emergency electricity generators and subsequent failure of the cooling systems of plants in seismically very active regions one of the most likely risks. The Japanese Nuclear and Industrial Safety Agency (NISA) cited this report in 2004. According to Jun Tateno, a former NISA scientist, TEPCO did not react to these warnings and did not respond with any measures.[33]

Film maker Adam Curtis mentioned the risks of the type of boiling water reactors cooling systems such as those in Fukushima I,[34] and claimed the risks were known since 1971[35] in a series of documentaries in the BBC in 1992 and advised that PWR type reactors should have been used.

Incidents and accident

  • In 1978, fuel rods fell in reactor No. 3, causing a nuclear reaction.[36] It took about seven and a half hours to place the rods back into proper positions[37].
  • On February 25, 2009 a manual shutdown was initiated during the middle of a startup operation. The cause was a high pressure alarm that was caused by the shutting of a turbine bypass valve. The reactor was at 12% of full power when the alarm occurred at 4:03am due to a pressure increase to 1,029.8 psi (7,100 kPa), exceeding the regulatory limit of 1,002.2 psi (6,910 kPa) The reactor was reduced to 0% power, which exceeded the 5% threshold that requires event reporting, and pressure dropped back under the regulatory limit at 4:25am. Later, at 8:49am the control blades were completely inserted, constituting a manual reactor shutdown. An inspection then confirmed that one of the 8 bypass valves had closed and that the valve had a bad driving fluid connection. The reactor had been starting up following its 25th regular inspection which began on October 18, 2008.[38]
  • On March 26, 2009 unit 3 had problems with over-insertion of control blades during outage. Repair work was being done on equipment that regulates the driving pressure for the control blades, and when a valve was opened at 2:23pm a control blade drift alarm went off. On later inspection it was found that several of the rods had been unintentionally inserted.[39]
  • On November 2, 2010 unit 5 had an automatic SCRAM while an operator was conducting an adjustment to the control blade insertion pattern. The SCRAM was caused by a reactor low water level alarm. The turbine tripped along with the reactor and there was no radiation injury to workers.[40]

Nuclear disaster of 2011

Main article: Fukushima Daiichi nuclear disaster
See also: Timeline of the Fukushima Daiichi nuclear disaster
Three of the reactors at Fukushima Daiichi overheated, causing meltdowns that eventually led to explosions, which released large amounts of radioactive material into the air.[41]

On 11 March 2011 an earthquake categorised as 9.0 MW on the moment magnitude scale occurred at 14:46 Japan Standard Time (JST) off the northeast coast of Japan. Units 4, 5 and 6 had been shut down prior to the earthquake for planned maintenance.[42][43] The remaining reactors were shut down automatically after the earthquake, and the remaining decay heat of the fuel was being cooled with power from emergency generators. The subsequent destructive tsunami with waves of up to 14 meters (the reactors were designed to handle up to 6 meters) disabled emergency generators required to cool the reactors. Over the following three weeks there was evidence of partial nuclear meltdowns in units 1, 2 and 3: visible explosions, suspected to be caused by hydrogen gas, in units 1 and 3; a suspected explosion in unit 2, that may have damaged the primary containment vessel; and a possible uncovering of the units 1, 3 and 4 spent fuel pools.[44] Radiation releases caused large evacuations, concern about food and water supplies, and treatment of nuclear workers.[45][46][47]

The events at units 1, 2 and 3 have been rated at Level 7 (major release of radioactive material with widespread health and environmental effects r­equiring implementation of planned and extended countermeasures) on the International Nuclear Event Scale, and those at unit 4 as Level 3 (Serious Incident) events.[48]

On 3 April 2011, two bodies were discovered in the basement turbine room most likely because the workers ran there during the tsunami.[49]

See also

Portal icon Japan portal
Portal icon Nuclear technology portal
Portal icon Energy portal
2011 Earthquake-Tsunami accident
  • 2011 Japanese nuclear accidents
  • Radiation effects from Fukushima Daiichi nuclear disaster
  • Japanese reaction to Fukushima Daiichi nuclear disaster
  • International reaction to the Fukushima Daiichi nuclear disaster

References

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  2. ^ "Tokyo Electric Power Co. Fukushima Daiichi Nuclear Power Station". jnes.go.jp. http://www2.jnes.go.jp/atom-db/en/general/atomic/ke02a13/info_f.html. Retrieved March 17, 2011. 
  3. ^ http://www.asahi.com/english/TKY201104060126.html Fukushima No. 1 plant designed on 'trial-and-error' basis
  4. ^ Dedman, Bill (March 13, 2011). "General Electric-designed reactors in Fukushima have 23 sisters in U.S". MSNBC. http://openchannel.msnbc.msn.com/_news/2011/03/13/6256121-general-electric-designed-reactors-in-fukushima-have-23-sisters-in-us. Retrieved March 14, 2011. 
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  22. ^ Asahi. Tepco Withdrawal of Plans for New Construction at Fukushima Daiichi. (Japanese)
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  30. ^ http://www.telegraph.co.uk/news/worldnews/asia/japan/8408863/Japan-tsunami-Fukushima-Fifty-the-first-interview.html Japan tsunami: Fukushima Fifty, the first interview
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  37. ^ Ikuko Kao, Japan's TEPCO admits 1978 nuclear criticality, Reuters, 22 March 2007
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  46. ^ "Radiation leak feared at nuke plant, people urged to stay indoors". Kyodo News Agency. 15 March 2011. http://english.kyodonews.jp/news/2011/03/78123.html. 
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  49. ^ Dolak, Kevin; Neal Karlinsky; Wendy Brundiage; Ryan Creed (April 3, 2011). "Two Bodies Found at Japan Nuclear Complex". ABC News. http://abcnews.go.com/International/bodies-found-fukushima-dai-ichi-nuclear-complex-japan/story?id=13286621. Retrieved 3 April 2011. 

External links


v · d · eNuclear power in Japan
Active LWR plants
Fukushima Daiichi · Fukushima Daini · Genkai · Hamaoka · Higashidōri · Ikata · Kashiwazaki-Kariwa · Mihama · Ōi · Onagawa · Sendai · Shika · Shimane · Takahama · Tokai · Tomari · Tsuruga
Other plants
Kaminoseki · Maki · Monju · Namie-Odaka · Ōma · Fugen (ATR) (inactive) · Jōyō (FBR) · Rokkasho (reprocessing)
Fukushima Daiichi nuclear disaster
Cleanup · Timeline · Radiation effects · Japanese reaction · International reaction · Reactor units 4, 5 and 6
Companies
Organisations
Anti-nuclear movement
Anti-nuclear protests · Citizen's Nuclear Information Center · Tetsunari Iida · Haruki Murakami · Kenzaburo Oe  · Ryuichi Sakamoto
Miscellaneous
2011 Japanese nuclear accidents · Iwaishima · Japanese nuclear incidents · Radiation Monitoring · Genpatsu-shinsai
v · d · e2011 Tōhoku earthquake and tsunami
Aftermath • Humanitarian response  · Foreshocks and aftershocks
Affected areas
Affected infrastructure
Ichihara refinery • Fujinuma Dam • Ōarai-Kashima Line • Sendai Airport • Tōhoku Shinkansen • Joban Line (Shinchi Station) • Senseki Line • Kesennuma Line
Nuclear accidents
Fukushima Daiichi nuclear disaster (Fukushima Daiichi Nuclear Power Plant • Timeline • International reaction • Japanese reaction • Radiation effects • Fukushima 50) • Fukushima Daini Nuclear Power Plant (Timeline) • Onagawa plant • Tōkai plant • Rokkasho plant
Aftershocks
Miyagi, Japan (7.1, 7 April) • Fukushima, Japan (6.6, 11 April)
People
Fundraisers
Artistes 311 Love Beyond Borders • Download to Donate: Tsunami Relief • Fight and Smile • Songs for Japan
Other
Impact on video game industry • Operation Tomodachi
See also: List-Class article Japanese earthquakes  · Seismicity of the Sanriku coast  · Historic tsunamis  · List-Class article Nuclear power in Japan, section Seismicity  · Nuclear and radioactive incidents

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