The Mainichi Daily News reported Monday:
A small amount of radioactive gas leaked from a nuclear power plant in Tsuruga, Fukui Prefecture, but there is no impact on the surrounding environment, the plant’s operator Japan Atomic Power Co. said Monday.
The trouble broke out at the plant’s No. 2 reactor which was manually halted Sunday as the level of radioactive substances in the primary coolant water increased, the operator said.
A radiation monitor showed the slight increase of the radioactive gas in emissions from the reactor building later in the day during work to lower the radiation level in the coolant water, it said.
The radiation level returned to normal soon after the valves of devices and pipes concerned were closed, the operator said, adding it is examining the cause of the leak closely.