The Nuclear and Industrial Safety Agency will request the operators of the Tomari plant in Hokkaido, Tsuruga and Monju plants in Fukui Prefecture and the Shimane plant in Shimane, to re-examine the effects of seismic activities that it says became more active after the March 2011 earthquake in northern Japan.
NISA says the risk has increased of active faults more than 5 kilometers away from each other shifting simultaneously and causing a greater earthquake than predicted.
There is even more worry now related to the potential that a major tremor involving multiple plates could initiate an earthquake stronger than quake-proofing standards.
Hokkaido Electric Power Company says even if the 2 active faults on the sea and the land move at the same time, the assumed temblor in part of the Tomari facility will be a little larger than that previously calculated. The utility says quake resistance can be secured as important buildings are little affected by the quake.
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