Fukushima Daini nuclear power plant

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Fukushima Daini nuclear power plant
FUKUSHMA2-NPP.JPG
location
Fukushima Daini Nuclear Power Plant (Fukushima Prefecture)
Fukushima Daini nuclear power plant
Coordinates 37 ° 19 '10 "  N , 141 ° 1' 16"  E Coordinates: 37 ° 19 '10 "  N , 141 ° 1' 16"  E
Country: JapanJapan Japan
Data
Owner: Tōkyō Denryoku
Operator: Tōkyō Denryoku
Project start: 1976
Commercial operation: April 20, 1982

Active reactors (gross):

4 (4400 MW)
Energy fed in in 2007: 24,385 GWh
Energy fed in since commissioning: 621,733 GWh
Website: The nuclear power plant on the side of the operator
Was standing: July 2, 2008
The data source of the respective entries can be found in the documentation .

The disused nuclear power plant in Fukushima Daini or Fukushima II [ ɸɯkɯɕima ] ( Jap. 福島第二原子力発電所 Fukushima dai-ni Genshiryoku hatsudensho , Fukushima nuclear power plant no. 2 ') is located in the communities Naraha and Tomioka in district Futaba in Fukushima Prefecture 200 Kilometers from Tokyo directly on the sea. The name is explained by the fact that the plant was built near - about 12 kilometers south - of the older Fukushima Daiichi (Fukushima I) nuclear power plant . Like Fukushima I, the power plant was operated by Tepco .

technology

The nuclear power plant consists of four boiling water reactors of the fifth generation of a line of boiling water reactors ( BWR / 5 : Boiling Water Reactor ) designed by General Electric . Reactors 1 and 3 are from Toshiba , 2 and 4 from Hitachi . The reactor cores are in safety containers (containment) , which were also designed by General Electric. These are second generation containments (Mark II) .

The facility is located directly on the sea and has its own port. There cooling water is pumped and radioactive waste is shipped. Overall, the facility covers an area of ​​approx. 1.5 km².

Incidents

At the turn of the year 1999/2000 at 8:58 a.m., the display for the control rods failed . A clock on the display terminal showed the date “6. February 2036 ". After the clock was set, everything went back to normal.

In August 2002 it emerged that reports from the operator TEPCO had been falsified for 16 years and that inspections had been delayed for cost reasons. All TEPCO nuclear power plants were then shut down over the next few months. At the Fukushima II site, all reactors were shut down from April 14 to August 31, 2003. Block 4 was the last to go back into operation on November 4, 2004.

2011 earthquake in Japan

On March 11, 2011, during the Tōhoku earthquake ( magnitude 9) at 2:48 p.m. local time at all four units of the power plant, which were all in power operation at that time, the automatic reactor controls initially carried out a reactor shutdown according to the process and the insulation status manufactured the reactor containment. As planned, this was associated with the loss of the main heat sinks due to the closed feedwater and live steam valves. The dissipation of the decay heat took place in water-filled condensation chambers serving as substitute heat sinks. Due to the flooding of the cooling water pumps for units 1, 2 and 4 in the pump house by the sea, the make-up water feed systems were temporarily used as auxiliary feed pumps. The following day the pump house was emptied with small mobile pumps and new pump motors were installed for the cooling water pumps, so that the cooling water supply for the condensation chamber cooling functioned normally again.

The tsunami triggered by the earthquake reached Fukushima-Daini at a height of 6.5 to 7 meters and temporarily flooded parts of the power plant area up to a height of 2.5 meters, but did not cause any damage to the reactor blocks in the strict sense.

In units 1, 2 and 4 the temperature in the condensation chambers reached 100 ° C on the following day at 5:22, 5:32 and 6:07 a.m. local time, which meant that the function of the pressure reduction systems was lost. Therefore, an incident was declared for each of these three blocks at these times. In order to be able to counter a dangerous rise in pressure in the reactor containment, a filtered discharge of low-level radioactive air-water vapor mixture through the exhaust chimneys was prepared at all four blocks during the day. However, no corresponding measures were necessary. Block 3 was shut down cold at 12:15 p.m. (temperature in the reactor <100 ° C.); further cooling measures were necessary in the other blocks. The operator TEPCO declared the state of all four reactors to be stable on the evening of March 12th. Full emergency cooling was restored in Unit 1 on March 14 at 1:24 a.m., and in Unit 2 at 7:13 a.m. The system was continuously supplied with electrical energy. Several aftershocks took place. There were several incorrect instrument displays.

During the event, apparently in the immediate aftermath of the earthquake, a local worker died in a crane accident and four other workers were injured.

The danger posed by the temporary loss of the pressure relief systems led to the declaration of a nuclear emergency by the Japanese government, which had happened immediately before for the first time in the history of Japan for the more severely affected nearby Fukushima Daiichi nuclear power plant . Initially, an evacuation zone with a radius of three and later of ten kilometers was arranged for Fukushima II. However, the evacuation area was almost entirely within the larger evacuation area for Fukushima I. A total of around 185,000 people were evacuated. 230,000 iodine tablets were held on site for distribution. The temperature in all reactors could be lowered to below 100 ° C on March 15th; a condition called "shutdown cold" or "cold shutdown". The incidents in units 1, 2 and 4 were classified as INES level 3 ( “Serious Incident” ) by the Japanese Nuclear Safety Authority on March 12 and 18, 2011 .

Shutdown

The President of Tepco, Tomoaki Kobayakawa, said in talks with the Governor of the Fukushima Region, Masao Uchibori, in mid-June 2018 that the company was considering decommissioning the plant. An uncertain status of the plant is hindering the rebuilding process in the region, said Kobayakawa. The people of Fukushima urgently want a shutdown, added Uchibori. On September 30, 2019, the plant, which had been shut down since March 2011, was officially shut down.

Data of the reactor blocks

The Fukushima II nuclear power plant has a total of four blocks :

Reactor block Reactor type net
power 		gross
power 		start of building Network
synchronization 		Commercialization
of essential operation 		switching off
processing
Fukushima Daini 1 Boiling water reactor Mark II-BWR / 5 1067 MW 1100 MW March 16, 1976 07/31/1981 04/20/1982 09/30/2019, de facto 3/2011
Fukushima Daini 2 Boiling water reactor Mark II-BWR / 5 1067 MW 1100 MW May 25, 1979 06/23/1983 02/03/1984 09/30/2019, de facto 3/2011
Fukushima Daini 3 Boiling water reactor Mark II-BWR / 5 1067 MW 1100 MW 03/23/1981 12/14/1984 06/21/1985 09/30/2019, de facto 3/2011
Fukushima Daini 4 Boiling water reactor Mark II-BWR / 5 1067 MW 1100 MW 05/28/1981 12/17/1986 08/25/1987 09/30/2019, de facto 3/2011

See also

Web links

Commons : Fukushima II Nuclear Power Plant  - Collection of Pictures, Videos and Audio Files

Individual evidence

  1. ^ Martyn Williams: Computer problems hit three nuclear plants in Japan. CNN January 3, 2000, archived from the original October 1, 2012 ; accessed on August 7, 2016 .
  2. ↑ Operating Records of Nuclear Power Plants in August 2003 (PDF; 619 kB) In: JAIF. 2003, archived from the original on November 16, 2011 ; accessed on August 7, 2016 .
  3. ↑ Operating Records of Nuclear Power Plants in November 2004. (PDF; 71 kB) In: JAIF. 2004, archived from the original on November 16, 2011 ; accessed on August 7, 2016 . (Block 1 is switched off again for maintenance work at this point in time.)
  4. ^ Cold shutdowns at Fukushima Daini
  5. ↑ Experience and research report 2011 . ENSI
  6. ↑ Results of the investigation regarding tsunami arrived in Fukushima Daiichi Nuclear Power Station and Fukushima Daini Nuclear Power Station ( English ) Tepco. April 9, 2011. Archived from the original on April 11, 2011. Retrieved on April 11, 2011.
  7. ↑ Consolidated communication from the reactor operator , March 14, 2011
  8. ↑ a b IAEA update on Japan Earthquake
  9. ↑ <福島 第二 原子 力 発 電 所 プ ラ ン ト 状況 等 の お 知 ら せ> (PDF; 91 kB)
  10. ↑ Radiation leak feared at nuke plant, people urged to stay indoors. In: Kyodo News. March 15, 2011, archived from the original on March 21, 2011 ; accessed on August 7, 2016 . (Meanwhile, the No. 4 reactor of TEPCO's Fukushima No. 2 nuclear plant, which is adjacent to the No. 1 plant, has successfully cooled down, meaning the plant no longer has a reactor in an emergency situation.)
  11. ↑ Information on the situation in the Japanese nuclear power plants Fukushima, Onagawa and Tokai. (No longer available online.) Society for Reactor Safety , March 18, 2011, archived from the original on April 12, 2011 ; Retrieved March 18, 2011 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.grs.de
  12. ^ Tepco to scrap another nuclear plant in Fukushima. In: Kyodo News. June 14, 2018, accessed June 15, 2018 .
  13. ↑ https://pris.iaea.org/PRIS/CountryStatistics/CountryDetails.aspx?current=JP
  14. ↑ Performance data of the Japanese reactors in the Power Reactor Information System (PRIS) of the IAEA (English)