Tokyo Electric Power Company Holdings has taken the precautionary measure following an alarm issue at the Kashiwazaki-Kariwa facility
Japan’s Kashiwazaki-Kariwa nuclear plant, the world’s largest, was shut down a day after restarting, the operator Tokyo Electric Power Company Holdings (Tepco) has said, citing a malfunction in the control rod monitoring system.
In March 2011, a powerful earthquake and an ensuing tsunami caused meltdowns at Japan's Fukushima Nuclear Power Plant, also operated by Tepco. It was the most devastating such incident since the 1986 Chernobyl disaster in the Soviet Union. The Japanese government subsequently decided to take all 54 of the country’s commercial nuclear plants offline for maintenance and structural review. However, in recent years, the authorities in Tokyo moved to reactivate the idled nuclear power plants in a bid to stabilize energy prices.
On Thursday, the company said it was shutting down a reactor at the Kashiwazaki-Kariwa facility. According to the operator, Unit 6 was restarted on Wednesday after 13 years offline only for a control-rod operation monitor alarm to go off the following day. Attempts to fix the safety system failed, forcing the precautionary shutdown. Control rods are used to adjust nuclear reactions at power plants.
Read more Germany made a ‘strategic mistake’ – Merz“The investigation is currently ongoing, but as it is expected to take time to determine the cause, we decided to temporarily shut down the plant on January 22nd to inspect the affected section,” Tepco stated.
The plant also faced alarm problems during a final test last Saturday, delaying the restart by a day. Japan’s Nuclear Regulation Authority said that the reactor is stable and no safety issues have been detected, local media reported.
In May 2023, Japan’s nuclear watchdog extended a ban on operations at the Kashiwazaki-Kariwa nuclear facility over safety concerns, after an employee had lost a stack of documents related to security protocols at the power plant.
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