Emergency cooling system malfunction means cut in Kansai power supply
FUKUI — A reactor at the Oi nuclear power plant in Fukui Prefecture was to be manually shut down Saturday night due to a problem with its cooling system, operator Kansai Electric Power Co. said.
The Nuclear and Industrial Safety Agency said the problem with the plant’s No. 1 reactor poses no environmental hazard.
The shutdown will affect the electric power supply in the Kansai region, and two more reactors run by Kepco are scheduled to be halted Thursday and Friday for regular inspections and maintenance.
This will mean eight out of 13 commercial reactors in Fukui Prefecture run by Kepco will be offline.
Reactor 1 at the Oi plant has been undergoing adjustment procedures prior to commercial operations for an unusually long period of about four months.
According to NISA and Kepco, the pressure inside the accumulator in the reactor’s emergency core cooling system temporarily fell Friday night, setting off an alarm.
The accumulator holds coolant to be injected into the reactor in an emergency.
The pressure stabilized, but the utility planned to halt the reactor Saturday night to find out what caused the problem.