Publication of the Investigation Report on the Inappropriate Conduct Related to the Formulation of Design-Basis Ground Motion in the Review for Conformity with New Regulatory Requirements at the Hamaoka Nuclear Power Station
Chubu Electric Power Company,Incorporated
Hamaoka Nuclear Power Station Units 3 and 4
Potentially problematic conduct in the seismic motion assessment and the formulation of design-basis ground motion. The detailed causes are set out in Section 6 of the Investigation Report, but the specific causes are Not disclosed in the text of this disclosure.
Related procedures
The Nuclear Regulation Authority's review for conformity with new regulatory requirements under the Act on the Regulation of Nuclear Source Material, Nuclear Fuel Material and Reactors
Nuclear Regulation Authority
Company response
Investigation Committee. The chair's name and the establishment date are Not disclosed.
Management reforms centered on transforming awareness and behavior, reforming organizational culture, and transforming and strengthening governance and checking functions
The company will pursue management reforms, make every effort to ensure the thorough implementation of measures to prevent recurrence, and restore lost trust.
| Item | Details |
|---|---|
| Event name | Publication of the Investigation Report on the Inappropriate Conduct Related to the Formulation of Design-Basis Ground Motion in the Review for Conformity with New Regulatory Requirements at the Hamaoka Nuclear Power Station |
| Date of occurrence | 11 September 2026 (the date the Investigation Committee's report was received) |
| Date recognized / date notice received | 11 September 2026 (receipt of the Investigation Committee's report) |
| Subject Entity | Chubu Electric Power Company,Incorporated |
| Target Locations / Products | Hamaoka Nuclear Power Station Units 3 and 4 |
| Cause | Potentially problematic conduct in the seismic motion assessment and the formulation of design-basis ground motion. The detailed causes are set out in Section 6 of the Investigation Report, but the specific causes are Not disclosed in the text of this disclosure. |
| Type of litigation or proceeding | The Nuclear Regulation Authority's review for conformity with new regulatory requirements under the Act on the Regulation of Nuclear Source Material, Nuclear Fuel Material and Reactors |
| Court or authority | Nuclear Regulation Authority |
| Investigation structure | Investigation Committee. The chair's name and the establishment date are Not disclosed. |
| Measures to prevent recurrence | Management reforms centered on transforming awareness and behavior, reforming organizational culture, and transforming and strengthening governance and checking functions |
| Outlook | The company will pursue management reforms, make every effort to ensure the thorough implementation of measures to prevent recurrence, and restore lost trust. |
Items this document does not state (14)
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 necessary partial non-disclosure measures to limit the impact on parties involved in the subject matter and protect individuals' privacy have been completed.