Kansai Electric Power Co. and Japan Atomic Energy Agency should conduct additional checks for fault lines under the Mihama plant and the fast-breeder reactor at Monju, according to the Nuclear and Industrial Safety Agency.
Fractured zones under the two plants in Fukui prefecture, western Japan, may move together with an active fault line near the stations, the nuclear watchdog said today in a draft report.
The agency, known as NISA, earlier ordered additional seismic investigations at the Higashidori, Shika, Tsuruga, and Ohi nuclear plants as the country carried out additional safety assessments after the March 11, 2011, quake and tsunami. The plant operators may be forced to decommission the reactors if the fault lines are confirmed to be active.
Kansai Electric and Hokuriku Electric plan to submit an interim report on the additional surveys at Ohi and Shika to the regulators by the end of October, the agency said. Tohoku Electric and Japan Atomic will report on Higashidori and Tsuruga by the end of November, the agency said.