en.Wedoany.com Reported - On May 18, Tohoku Electric Power Company announced the cause of the steam leak at Unit 2 of the Onagawa Nuclear Power Plant, located in Onagawa Town and Ishinomaki City, Miyagi Prefecture.

The unit is used to store water produced after steam separation. Following an investigation, the cause of the leak was identified as a thin metal fragment that became lodged between the valve seat and valve body of a valve connected to the water tank, resulting in reduced airtightness. On the 15th, steam was observed rising from the storage tank. The steam inside the turbine building contained radioactive substances, but no leakage to the outside has been confirmed, and there has been no impact on the surrounding area.

Tohoku Electric Power shut down the reactor for inspection on the 16th and restarted it after removing the metal fragment. Commercial operation is expected to resume in early June as originally planned.

Onagawa Unit 2 entered a routine inspection phase in January and restarted the reactor on May 11. The routine inspection is now nearing completion.

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