Manual shutdown of Reactor Unit 3 at the Mihama Nuclear Power Plant
The Kansai Electric Power Company,Incorporated
Insulation material around the air vent valve on the outlet piping of the normal water-level control valve for the No. 6A high-pressure feedwater heater at Mihama Nuclear Power Station Unit 3
If any matters requiring disclosure, including any impact on business performance, are identified, we will promptly announce them.
Company response
Manual shutdown of the reactor at Mihama Nuclear Power Station Unit 3. Load reduction began at 20:30 on 17 September 2026.
An inspection of the relevant location will be conducted.
If any matters requiring disclosure, including any impact on business performance, become known, we will notify you promptly.
| Item | Details |
|---|---|
| Event name | Manual shutdown of Reactor Unit 3 at the Mihama Nuclear Power Plant |
| Date of occurrence | Around 15:45 on 17 September 2026 (water dripping confirmed) |
| Date recognized / date notice received | Around 15:45 on 17 September 2026 (confirmed by a company employee) |
| Subject Entity | The Kansai Electric Power Company,Incorporated |
| Target Locations / Products | Insulation material around the air vent valve on the outlet piping of the normal water-level control valve for the No. 6A high-pressure feedwater heater at Mihama Nuclear Power Station Unit 3 |
| Impact on Earnings Forecast | If any matters requiring disclosure, including any impact on business performance, are identified, we will promptly announce them. |
| Suspended operations | Manual shutdown of the reactor at Mihama Nuclear Power Station Unit 3. Load reduction began at 20:30 on 17 September 2026. |
| Outlook | An inspection of the relevant location will be conducted. |
| Planned follow-up disclosure | If any matters requiring disclosure, including any impact on business performance, become known, we will notify you promptly. |
Items this document does not state (16)
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.Because the system at the relevant location could not be isolated and to ensure safe future operation.