The Kansai Electric Power Company, Incorporated
Manual Reactor Shutdown at Mihama Power Plant Unit 3
On May 8, 2026 at 04:24, the reactor at Mihama Power Plant Unit 3 was manually shut down. In response to an alarm indicating a large temperature difference in the upper and lower parts of the high-pressure turbine compartment, the team confirmed a steam leak and took prompt action. There was no radiological impact on the environment.
Key Figures
- Manual Reactor Shutdown Time: 2026-05-08 04:24
- Steam Leak Confirmation Time: Around 2026-05-08 04:10
- Steam Leak Stop Confirmation Time: 2026-05-08 04:43
AI要約
Overview of the Event
At 04:08 on May 8, 2026, an alarm indicating a large temperature difference in the upper and lower parts of the high-pressure turbine compartment was triggered at Mihama Power Plant Unit 3 (operating under constant rated thermal output). The operator confirmed a steam leak from around the high-pressure turbine area. The reactor was manually shut down at 04:24, and by 04:43, it was confirmed that the steam leak had stopped. Further investigation into the cause is planned.
Impact and Future Responses
This incident involved a steam leak from the secondary system, with no radiological impact on the environment. The company will promptly disclose any findings that could affect earnings or require public disclosure.
Kansai Electric Power Company, Incorporated
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