Ōi Nuclear Power Plant
| Ōi Nuclear Power Plant | |
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Units 3 and 4
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 Location of Ōi Nuclear Power Plant in Japan
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| Country | Japan |
| Location | Ōi, Fukui Prefecture |
| Coordinates | 35°32′26.25″N 135°39′7.32″E / 35.5406250°N 135.6520333°ECoordinates: 35°32′26.25″N 135°39′7.32″E / 35.5406250°N 135.6520333°E |
| Construction began | 26 October 1972 |
| Commission date | 27 March 1979 |
| Operator(s) | Kansai Electric Power Company |
| Nuclear power station | |
| Reactor type | PWR |
| Reactor supplier |
Westinghouse MHI |
| Cooling source | Sea of Japan |
| Cooling towers | no |
| Power generation | |
| Units operational | 2 x 1,175 MW 2 x 1,180 MW |
| Make and model |
MHI Melco |
| Nameplate capacity | 4,710 MW |
| Capacity factor | 66.2% |
| 2010 generation | 27,298 GW·h |
The Ōi Nuclear Power Plant (大飯発電所 Ōi hatsudensho?, Ōi NPP) is a nuclear power plant located in the town of Ōi, Fukui Prefecture, managed by the Kansai Electric Power Company. The site is 1.88 square kilometres (460 acres). Ōi Units 3 and 4 were Japan's last operating nuclear power plants, being taken offline in September, 2013.
On 22 December 2005, at 8:50am there was trouble with a power line due to strong winds and heavy snow, the reactor was shut down as a result.
On 15 July 2011, Kansai Electric announced that two more nuclear power reactors in Fukui Prefecture would be shut down for regular inspections. The result of this decision was that 6 reactors were shut down, over half the utility's 11 reactors. The No. 4 reactor of the plant in Takahama Town will be brought to a halt for regular inspections on 21 July, and the No. 4 reactor of the plant in Oh Town, on 22 July. Regular inspections are nearly complete at two other reactors. However the plan of the Japanese government to introduce safety stress tests for the nation's nuclear plants leaves it unclear when they could be brought back on line.
On 15 July 2011, the pressure in a tank with boric-acid dropped unexpectedly. This tank injects water into the reactor in the event of an emergency. This made it impossible to inject water in a proper way into the No. 1 reactor. The reactor would be manually shut down around 9 PM on 16 July to look into the cause of the problem, although pressure returned to normal in about one hour. It was said that the trouble did not cause any leak of radioactive substances to the outside.
In August 2011 citizens of the prefecture Shiga, at the banks of Lake Biwa, started a lawsuit at the Otsu District Court, and asked a court order to prevent the restart of seven reactors operated by Kansai Electric Power Company, in the prefecture Fukui.
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