The Osaka District Court has invalidated Nuclear Regulation Authority (NRA) approval for the No. 3 and 4 reactors to operate at Kansai Electric Power Co.’s Oi nuclear power station in Fukui Prefecture, on the Sea of Japan coast. The ruling is the first to revoke national approval for a reactor since the March 2011 Fukushima nuclear disaster. The Oi plant case centered on the validity of the “design basis seismic ground motion” calculation, used to determine what earthquake-proofing a facility requires. The calculation predicts a reactor’s expected maximum oscillation, and is based on an average of previous earthquake data.
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