Japan’s largest nuclear power plant has been halted due to an alarm after it was reactivated.

This Thursday, the company TEPCO stopped reactor number 6 at the Kashiwazaki-Kariwa nuclear plant after an alarm was triggered in the control rod monitoring system, one day after the facility had been restarted. The company reported that during the process of extracting the control rods, an alarm was activated for one of the rods, leading to the suspension of operations. The company attempted to replace the electrical components in the panel that controls the control rods, but the issue persisted, prompting an investigation. The information was released one day after TEPCO restarted the plant, marking fifteen years since its closure in 2011 due to the incident at the Fukushima nuclear plant, which was also operated by the same company. The Niigata prefectural assembly approved the restart of reactor number 6 in December, after receiving the authorisation from the national nuclear regulator to bring two of the seven reactors at the complex back online.