Onagawa Nuclear Power Plant
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| Onagawa Nuclear Power Plant | |
 The Onagawa NPP
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| Data | |
|---|---|
| Country | Japan |
| Operator | Tohoku Electric Power Company |
| Built | 1970 |
| Start of commercial operation | June 1, 1984 |
| Reactors | |
| Reactors active | 3 (2174 MW) |
| Power | |
| Capacity | MW |
| Total power generation in 2006 | 5,283 GWh |
| Average annual generation (last 5 yrs) | 10,995 GWh |
| Net generation | 157,545 GWh |
| Other details | |
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As of July 25, 2007
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The Onagawa Nuclear Power Plant (女川原子力発電所 Onagawa genshiryoku hatsudensho?, Onagawa NPP) is a nuclear power plant in Onagawa in the Oshika District and Ishinomaki city, Miyagi Prefecture, Japan. It is managed by the Tohoku Electric Power Company. It was the most quickly constructed nuclear power plant is the world.
The Onagawa-3 unit is the most modern plant in all of Japan. It was used as a prototype for the Higashidori NPP. It conforms fully to ISO 14001. The waste heat water leaves 7 degrees[vague] higher than it came in and is released 10 meters under the surface of the water, so that it has less effect on the environment.
All the reactors were constructed by Toshiba.
Contents |
[edit] Reactors on Site
| Unit | Type | Begin of Operation | Electric Power |
|---|---|---|---|
| Onagawa - 1 | BWR | June 1, 1984 | 524 MW |
| Onagawa - 2 | BWR | July 28, 1995 | 825 MW |
| Onagawa - 3 | BWR | January 30, 2002 | 825 MW |
[edit] Unit 1
Since November 11, 2006 this unit has been shut down due to the result of a test.
[edit] Unit 2
- May 2006 it was confirmed that a pipe was leaking due to debris damage.
- June 7, 2006 Difficulties with pressure control, further inspections prompted.
- July 7, 2006 METI and the Nuclear and Industrial Safety Agency determined that plant was not operating to performance.
[edit] Unit 3
- July 7, 2006 Due to pipe integrity concerns the reactor was shut down.
- November 25, 2006 Started back up.
[edit] Earthquake Events
The Onagawa NPP was affected by the 2005 Miyagi earthquake and recorded vibrations above what the plant was designed for. Analysis after the event, however, found no damage to the reactor systems. Some people reported seeing smoke come from the plant after the earthquake and reported it, thinking that it indicated an accident, but the smoke was actually produced by the diesel generators which are designed to start up in such an event so that off-site power can still be provided to certain reactor systems. A tank of sulfuric acid on the roof, however, did burst releasing some sulfuric acid into the air, but it was retrieved and processed later.
[edit] External links
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