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Wednesday, November 19, 2014

NRA finds fault under JAPC Tsuruga NPP "recently active"

A report today is out that the Nuclear Regulation Authority in Japan has received report from an independent expert panel that faults near and under Japan Atomic Power Company's Tsuruga Nuclear Plant may be considered active.

Debate has gone back and forth between the NRA and JAPC about the most recent active dates for faults near the plant.  An NRA panel found likelihood of activity near or under Unit 2 at the plant in May of 2013, after which JAPCo convened its own study to counter the NRA report.

An English summary of the June 2014 "Second Review" by JAPC can be found here.

Now, the NRA has returned to yet again counter JAPC with a further report.  The uptake from this is that if JAPC cannot prove to the NRA that the faults near the nuclear plant haven't been active in a VERY long time, i.e. 120,000 to 130,000 years, and cannot move, then JAPC may be forced to decommission the Tsuruga NPP.

Located at Tsuruga are two units - of course long since shut down, along with all other Japanese nuclear plants.  Tsuruga Unit 1 is a Boiling Water Reactor that went into service in 1970, while Unit 2 is a Pressurized Water Reactor which went into operation in 1987.  Preparations were underway at the site to construct two more units, which were to have been Mitsubishi APWR units but that construction has been deferred indefinitely.

Neither of these units at Tsuruga have applied to the NRA for restart examination; JAPCo's only operative unit on the opposite coast (the East coast of Japan) from Tsuruga, which is Tokai No. 2 has applied for restart and should the decommissioning of the units at Tsuruga be necessary Tokai No. 2 would be JAPC's only remaining operational unit.

Should this finding of seismic activity be upheld, Tsuruga would be the first NPP in Japan forced to decommission on seismic grounds following the Fukushima Daiichi accident.

11:45 AM Eastern 11/19/2014

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