Kansai Electric Power of Japan has announced that it halted operations on 16 July at its No 1 reactor at Oi nuclear power plant in Oicho, Fukui prefecture, because of a problem with a tank used to store water for emergency reactor cooling.

According to Kansai Electric, pressure inside a tank containing water mixed with boric acid – a solution used to inhibit fission – decreased at 10.45 pm on 15 July.

The incident did not violate company safety standards, and the pressure returned to normal within an hour, but the operator said it decided to stop operations at the reactor to investigate the cause of the pressure dip.

Kansai Electric could not confirm when it will restart the No 1 reactor. Once its investigation is complete it will need approval from the Fukui prefectural government to restart the reactor.

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