Monju Nuclear Power Plant
| Monju Nuclear Power Plant | |
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Monju Nuclear Power Plant
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 Location of the Monju Nuclear Power Plant within Japan
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| Country | Japan |
| Location | Tsuruga, Fukui Prefecture |
| Coordinates | 35°44′25″N 135°59′17″E / 35.74028°N 135.98806°ECoordinates: 35°44′25″N 135°59′17″E / 35.74028°N 135.98806°E |
| Status | Being decommissioned |
| Construction began | May 10, 1986 |
| Commission date | August 29, 1995 May 6, 2010 (reactivated) |
| Decommission date | December 8, 1995 (suspended for 15 years) |
| Operator(s) | Japan Atomic Energy Agency |
| Nuclear power station | |
| Reactor type | FBR |
| Power generation | |
| Units operational | 1 × 280 MW |
| Nameplate capacity | 280 MW |
Monju (もんじゅ?) is a Japanese sodium-cooled fast reactor, located in Tsuruga Nuclear Power Plant, Fukui Prefecture. Its name is a reference to Manjusri.
The reactor has been inoperative for most of the time since it was originally built, and was last operated in 2010. It is planned to be decommissioned.
Monju is a sodium cooled, MOX-fueled, loop-type reactor with three primary coolant loops, designed to produce 280 MWe from 714 MWt. It has a breeding ratio of approximately 1.2. The plant is located on a site that spans 1.08 km2 (267 acres), the buildings occupy 28,678 m2 (7 acres), and it has 104,680 m2 of floor space. It employs 368 workers.
Construction started in 1986 and the reactor achieved criticality for the first time in April 1994.
An accident in December 1995, in which a sodium leak caused a major fire, forced a shutdown. A subsequent scandal involving a cover-up of the scope of the accident delayed its restart until May 6, 2010, with renewed criticality reached on May 8, 2010. In August 2010 another accident, involving dropped machinery, shut down the reactor again. As of June 2011, the reactor has only generated electricity for one hour since its first testing two decades prior. As of the end of 2010, total funds spent on the reactor amounted to ¥1.08 trillion. An estimated ¥160-170 billion would be needed to continue to operate the reactor for another 10 years.
As of 2014, the plant had cost 1 trillion yen ($9.8 billion).
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