Onagawa Nuclear Power Plant

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Onagawa Nuclear Power Plant
Onagawa Nuclear Power Plant
Onagawa Nuclear Power Plant
location
Onagawa Nuclear Power Plant, Miyagi Prefecture
Onagawa Nuclear Power Plant
Coordinates 38 ° 24 '4 "  N , 141 ° 29' 59"  E Coordinates: 38 ° 24 '4 "  N , 141 ° 29' 59"  E
Country: Japan
Data
Owner: Tohoku Electric Power Company
Operator: Tohoku Electric Power Company
Project start: 1970
Commercial operation: June 1, 1984

Active reactors (gross):

2 (1650 MW)

Decommissioned reactors (gross):

1 (524 MW)
Energy fed in in 2010: 13,909.44 GWh
Energy fed in since commissioning: 204,503 GWh
Was standing: June 10, 2011
The data source of the respective entries can be found in the documentation .
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The Onagawa Nuclear Power Plant ( Japanese 女 川 原子 力 発 電 所 , Onagawa genshiryoku hatsudensho ) with seawater-cooled boiling water reactors is located in the area of Onagawa and Ishinomaki in Miyagi Prefecture . The facility is 1.73 square kilometers and belongs to the Tōhoku Denryoku . The power plant is located directly on the Pacific , on the Oshika Peninsula between the coastal hamlets of Tsukahama and Yoriiso, around 70 kilometers northeast of the city of Sendai .

Technical

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Onagawa-3 is one of the most modern blocks in Japan. It served as a prototype for the Higashidōri -1 nuclear power plant of the Tōhoku Denryoku. With its construction, an attempt was made to regain lost confidence. There is a visitor gallery and certification according to ISO 14001 . The heated cooling water - at least seven degrees warmer than before - is only fed back ten meters below the surface of the water. This should ensure a better mix and thus a smaller impact on the environment.

The reactors were built by Toshiba .

The nuclear power plant shut down safely in the Tōhoku earthquake and has been out of order since then. The operator would like to put Unit 2 back into operation, but the third floor of its reactor building lost around 70% of its structural stability in the earthquake.

Unit 1 is to be shut down for good because the operator considers necessary upgrades to be too expensive and time-consuming.

Units 2 and 3 are to go back into operation from March 2021 after a security wall has been built.

Incidents

  • In July 1988, control rods were removed instead of pushed in due to an error in the manual. The incident was not reported. Since the manual was used in several power plants, incidents also occurred there without the error being corrected. This led to an uncontrolled chain reaction lasting 15 minutes at the Shika nuclear power plant on June 18, 1999 . This incident was also not reported and only became known in 2007.
  • At the turn of the year 1999/2000, radioactivity monitoring failed for 10 minutes at 12:02 p.m. local time.
  • On February 24, 2000, a floor in an outbuilding burned down. The fire was extinguished after half an hour.
  • On February 4, 2002, two workers were lightly irradiated when they damaged a spray can during inspection work. They suffered burns from the fire that this triggered.
  • In March 2007, the company had to admit that an emergency shutdown had occurred during maintenance work on Onagawa 1 and the responsible authorities were not informed.
  • On March 11, 2011 , a fire broke out in a separate turbine building in the nuclear power plant as a result of the severe Tōhoku earthquake , the epicenter of which was only 75 km from the power plant. The power plant was shut down. Since it is built on a 15-meter-high artificial base, the tsunami wave did comparatively little damage here. However, as in Fukushima, the blocks were temporarily running on emergency diesel generators; two of the diesels in block 2 failed after a certain running time, the aftercooling had to be partly taken over by an emergency cooling system driven by its own steam; Both diesels were available again after a certain period of time after repair, which meant that the reactor could be cooled down without damage ( INES 2). The operator Tohoku Electric stated on the afternoon of March 13th (local time) that an increase in radiation to 400 times the normal radiation level had been determined, this radiation possibly originating from the Fukushima I nuclear power plant ; however, the prevailing wind direction spoke against it. As provided for in Article 10 of the Act on Special Measures Concerning Nuclear Emergency Preparedness , the lowest level of a nuclear emergency for the Onagawa nuclear power plant was declared around midnight on March 13th (local time). These radiation values ​​reached up to 21 µSv per hour, which is why the government was informed that after only 10 minutes the value fell to 10 µSv per hour.
  • An aftershock on April 7, 2011 led to the failure of the external power supply in the nuclear power plant, with emergency diesel engines taking over the cooling. In the first block, 3.8 liters of contaminated water spilled from the fuel element pool onto the reactor floor, with an activity concentration of 5410 Bq / kg. The external power supply was restored on April 10th, the contaminated water was removed.

Data of the reactor blocks

The Onagawa Nuclear Power Plant has three blocks :

Reactor block Reactor type net
power 		gross
power 		start of building Network
synchronization 		Commercialization
of essential operation 		switching off
processing
Onagawa-1 Boiling water reactor 498 MW 524 MW July 8, 1980 November 18, 1983 June 1, 1984 10/25/2018
Onagawa-2 Boiling water reactor 796 MW 825 MW April 12, 1991 December 23, 1994 July 28, 1995 in long-term standstill since 11/2010
Onagawa-3 Boiling water reactor 796 MW 825 MW January 23, 1998 May 30, 2001 January 30, 2002 Long-term standstill since 3/2011, no request for restart is available

See also

Web links

Individual evidence

  1. ↑ 1,130 cracks, 70% rigidity lost at Onagawa reactor building . In: The Asahi Shimbun . January 18, 2017 ( asahi.com ).
  2. ↑ world nuclear news: Tohoku decides to decommission oldest Onagawa unit of October 25, 2018
  3. ↑ world nuclear news: [1] from February 26, 2020
  4. ↑ Japantimes, March 23, 2007 (English)
  5. ^ CNN - Computer problems hit three nuclear plants in Japan ; English, accessed March 14, 2011
  6. ↑ The Independent, (London), Feb 25, 2000 (English) Link ??
  7. ↑ The Milwaukee Journal Sentinel, Aug 10, 2004 (English) Link ??
  8. ↑ WISE / NIRS Nuclear Monitor on March 19, 2007 ; English, accessed March 14, 2011
  9. ↑ 女 川 原子 力 発 電 所 の 概要 お よ び 東 日本 大 震災 時 の 対 応 状況 . In: Miyagi Prefecture. November 11, 2014. Retrieved August 7, 2016 (Japanese).
  10. ↑ ENSI : Experience and Research Report 2011, chap. Instructive foreign occurrences
  11. ↑ Eil +++ 400 times increased radioactivity in Miyagi Province ( Memento of the original from May 25, 2015 in the Internet Archive ) 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.wz-net.de
  12. ^ Act on Special Measures Concerning Nuclear Emergency Preparedness. (PDF; 215kB) In: Cabinet Secretariat. Accessed August 7, 2016 .
  13. ↑ iaea.org: IAEA update on Japan Earthquake , accessed on March 13, 2011
  14. ↑ Contamination checks on evacuated residents - Onagawa 'emergency'
  15. ↑ Information on the situation in the Japanese nuclear power plants Fukushima, Onagawa and Tokai (as of April 8, 2011, 12:00 p.m. CEST) GRS
  16. ^ Information of the Situation Caused by the Earthquake Off the Coast of Miyagi Prefecture. (PDF; 53kB) In: Ministry of Economy, Trade and Industry. April 11, 2011, archived from the original on March 28, 2012 ; accessed on August 7, 2016 .
  17. ↑ Power Reactor Information System of the IAEA : Japan: Nuclear Power Reactors - Alphabetic (English)
  18. ↑ https://www.japantimes.co.jp/news/2018/10/25/national/tohoku-electric-scrap-aging-no-1-unit-onagawa-nuclear-plant/