Regarding the Periodic Inspection Schedule for Mihama Nuclear Power Station Unit 3
The Kansai Electric Power Company,Incorporated
Mihama Power Station Unit 3 (pressurized water reactor, rated electrical output: 826,000 kilowatts)
The schedule for future work was reviewed based on the progress of the periodic inspection and the implementation status of various measures concerning the steam leak from the high-pressure turbine. The specific cause of the steam leak itself is not disclosed.
Company response
Manual shutdown of the reactor at Mihama Power Station Unit 3
15 September 2026 (scheduled grid connection)
The upper casing closure caps will be replaced. Various measures, including the establishment of guidelines, are under way. The company has reconfirmed that maintenance is being properly carried out on all equipment through which high-temperature, high-pressure steam or water flows.
The company will proceed with preparations to start the reactor and plans to connect the unit to the grid on 15 September 2026. The company will continue to steadily conduct the periodic inspection, with safety as its top priority.
| Item | Details |
|---|---|
| Event name | Regarding the Periodic Inspection Schedule for Mihama Nuclear Power Station Unit 3 |
| Date of occurrence | 8 May 2026 (the date on which a steam leak from the high-pressure turbine was confirmed and the reactor was manually shut down) |
| Date recognized / date notice received | 8 May 2026 |
| Subject Entity | The Kansai Electric Power Company,Incorporated |
| Target Locations / Products | Mihama Power Station Unit 3 (pressurized water reactor, rated electrical output: 826,000 kilowatts) |
| Cause | The schedule for future work was reviewed based on the progress of the periodic inspection and the implementation status of various measures concerning the steam leak from the high-pressure turbine. The specific cause of the steam leak itself is not disclosed. |
| Suspended operations | Manual shutdown of the reactor at Mihama Power Station Unit 3 |
| Scheduled resumption date | 15 September 2026 (scheduled grid connection) |
| Measures to prevent recurrence | The upper casing closure caps will be replaced. Various measures, including the establishment of guidelines, are under way. The company has reconfirmed that maintenance is being properly carried out on all equipment through which high-temperature, high-pressure steam or water flows. |
| Outlook | The company will proceed with preparations to start the reactor and plans to connect the unit to the grid on 15 September 2026. The company will continue to steadily conduct the periodic inspection, with safety as its top priority. |
Items this document does not state (15)
These are items the company does not state in this document. We do not leave them blank, nor fill them in from other sources or by inference.
The reasons the company gives
The company's own explanation, not something inferred from the numbers.The company reviewed the schedule for future work based on the progress of the periodic inspection and the implementation status of various measures concerning the steam leak from the high-pressure turbine.