Improving safety at the Hamaoka Nuclear Power Station and achieving compliance with regulatory standards
First written in FY2016. 8 of 22 entries say "Restated". Latest entry: 2026-10-08.
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- FY2026MaterialisedAnnual report
「At the Hamaoka Nuclear Power Station, we had been implementing further safety improvement measures based on the new regulatory standards and initiatives to promote understanding of nuclear power, while undergoing the conformity review for Units 3 and 4 under the new regulatory standards. However, following the inappropriate incident concerning the formulation of the reference seismic motion disclosed in January 2026, both activities have been suspended.」
The conformity review for Hamaoka Units 3 and 4 and related initiatives were suspended following the inappropriate incident concerning the formulation of the reference seismic motion. - FY2025-H1AdvancedAnnual report
「At the review meeting held in September 2023, the reference seismic motion was assessed as generally appropriate. At the review meeting held in October 2024, the reference tsunami was also assessed as generally appropriate. Going forward, we will respond to the review of plant-related matters and other issues.」
In the conformity review for Hamaoka Units 3 and 4, the reference tsunami was assessed as generally appropriate at the October 2024 review meeting, following the assessment of the reference seismic motion. The next step is the review of plant-related matters. - FY2024-Q3AdvancedAnnual report
「Units 3 and 4 are undergoing a review by the Nuclear Regulation Authority to confirm compliance with the new regulatory standards. The reference seismic motion was assessed as generally appropriate at the review meeting held in September 2023. The reference tsunami is also progressing steadily; once it has been assessed as generally appropriate, we will respond to the plant-related review and conduct activities to promote understanding of the safety of the Hamaoka Nuclear Power Station, including the effectiveness of the safety improvement measures.」
In the conformity review for Hamaoka Units 3 and 4, the reference seismic motion was assessed as generally appropriate at the September 2023 review meeting. The filing describes the next steps as the plant-related review and safety-understanding activities following assessment of the reference tsunami. - FY2024-Q2RestatedAnnual report
「We will continue to make every effort to obtain confirmation at an early stage that the plant complies with the new regulatory standards, communicate with local communities to obtain their understanding, and work toward restarting the Hamaoka Nuclear Power Station on the premise of ensuring safety.」
The group reaffirms its policy of continuing the conformity review for Units 3 and 4, safety improvement measures and communication with local communities, while aiming to restart the units on the premise of ensuring safety. - FY2022-Q3RestatedAnnual report
「We will continue to make every effort to obtain confirmation at an early stage that the plant complies with the new regulatory standards, while continuously pursuing initiatives to further improve safety on our own. We will also prepare to continue using the Hamaoka Nuclear Power Station as an important power source and make every effort to ensure that local communities and society understand these initiatives.」
The group reaffirms its policy of continuing the conformity review, safety improvements and activities to promote understanding in the community, while preparing to use the Hamaoka Nuclear Power Station as an important power source. - FY2022-Q2RestatedAnnual report
「The Hamaoka Nuclear Power Station is implementing safety improvement measures under the firm determination that an accident like that at the Fukushima Daiichi Nuclear Power Station must never happen again, and is undergoing a review by the Nuclear Regulation Authority to confirm compliance with the new regulatory standards. Once the reference seismic motion and reference tsunami have been substantially finalized, we will respond to the plant-related review and conduct activities to promote understanding of the safety of the Hamaoka Nuclear Power Station, including the effectiveness of the safety improvement measures based on those assessments.」
The planned progression to the plant-related review and activities to promote understanding of safety following substantial finalization of the reference seismic motion and reference tsunami was stated again. - FY2021AdvancedAnnual report
「The Hamaoka Nuclear Power Station is implementing safety improvement measures under the firm determination that an accident like that at the Fukushima Daiichi Nuclear Power Station must never happen again, and is undergoing a review by the Nuclear Regulation Authority to confirm compliance with the new regulatory standards. Once the reference seismic motion and reference tsunami have been substantially finalized, we will respond to the plant-related review and conduct activities to promote understanding of the safety of the Hamaoka Nuclear Power Station, including the effectiveness of the safety improvement measures based on those assessments.」
Once the reference seismic motion and reference tsunami had been substantially finalized, the group planned to move to the plant-related review and activities to promote understanding of the effectiveness of its safety improvement measures. - FY2019RestatedAnnual report
「For Units 3 and 4 of the Hamaoka Nuclear Power Station, we will steadily implement safety improvement measures based on the new regulatory standards, strengthen our internal structure and ensure an effective response to the review process so that compliance with those standards can be confirmed at an early stage. For Unit 5, we will continue preparations for an application for a conformity review in parallel with examining a specific restoration method for the seawater ingress incident.」
After most major work on Unit 4 had been substantially completed, the group continued responding to the review process for Units 3 and 4 and preparing a restoration method and review application for Unit 5. - FY2018RestatedAnnual report
「For Units 3 and 4 of the Hamaoka Nuclear Power Station, we will steadily implement safety improvement measures based on the new regulatory standards, strengthen our internal structure and ensure an effective response to the review process so that compliance with those standards can be confirmed at an early stage. For Unit 5, we will continue preparations for an application for a conformity review in parallel with examining a specific restoration method for the seawater ingress incident.」
Following substantial completion of the major work on Unit 4, the group continued its response to the review process, measures for Unit 3, and consideration of a restoration method and preparations for a review application for Unit 5, together with disaster prevention and evacuation measures. - FY2017RestatedAnnual report
「Most of the major construction work on Unit 4, including earthquake and tsunami countermeasures and measures for severe accidents planned after the Fukushima Daiichi Nuclear Power Station accident, has been substantially completed. We will continue to implement any revisions or additions to the work required based on the progress of the review or new findings as early as possible. For Unit 3, we will continue implementing measures based on the new regulatory standards following Unit 4. For Unit 5, we will consider measures based on the new regulatory standards in parallel with examining a specific restoration method for the seawater ingress incident and continue preparations for an application for review.」
While stating that major work on Unit 4 was substantially complete, the filing continued to cover additional work required through the review process, measures for Unit 3, and restoration and review-application preparations for Unit 5. - FY2017-Q3RestatedAnnual report
「Most of the major construction work on Unit 4, including earthquake and tsunami countermeasures and measures for severe accidents planned after the Fukushima Daiichi Nuclear Power Station accident, was completed in September 2016, except for some work. Some work, including work involving revisions to construction details based on conditions at the site and design changes reflecting the review process, will continue. If further revisions or additions become necessary based on the progress of the review or new findings, they will be implemented as early as possible. For Unit 3, we will continue implementing measures based on the new regulatory standards following Unit 4. For Unit 5, we will prepare for an application for review while considering measures based on the new regulatory standards in parallel with developing a specific restoration method for the seawater ingress incident.」
The filing again states that most major work on Unit 4 had been completed, while remaining work, measures for Unit 3 and preparations for Unit 5’s review application continued. - FY2017-Q2AdvancedAnnual report
「Most of the major construction work on Unit 4, including earthquake and tsunami countermeasures and measures for severe accidents planned after the Fukushima Daiichi Nuclear Power Station accident, was completed in September 2016, except for some work.」
The filing moved from the previous expectation of completion and stated that major work on Hamaoka Unit 4 had been completed in September 2016, except for some work. Remaining work, measures for Unit 3 and preparations for Unit 5’s review application continued. - FY2017-Q1RestatedAnnual report
「Most of the major construction work on Unit 4, including earthquake and tsunami countermeasures and measures for severe accidents planned after the Fukushima Daiichi Nuclear Power Station accident, was expected to be completed by around September 2016. However, some work would continue after September as construction details were reviewed based on conditions at the site and designs were changed to reflect the review process. If further revisions or additions became necessary based on the progress of the review or new findings, they would be implemented as early as possible. For Unit 3, we would continue implementing measures based on the new regulatory standards following Unit 4. For Unit 5, we would prepare for an application for review while considering measures based on the new regulatory standards in parallel with developing a specific restoration method for the seawater ingress incident.」
The filing stated that major work on Unit 4 was expected to be completed by around September 2016, while some work, measures for Unit 3 and preparations for Unit 5’s review application would continue. It described the continuation of the safety improvement and review response policy, without reporting completion as of the filing date. - FY2016First statedAnnual report
「For Units 3 and 4 of the Hamaoka Nuclear Power Station, we will steadily implement safety improvement measures based on the new regulatory standards, strengthen our internal structure and ensure an effective response to the review process so that compliance with those standards can be confirmed at an early stage. For Unit 5, we will formulate a restoration plan in response to the seawater ingress incident and continue detailed consideration of measures based on the new regulatory standards.」
Safety improvements, responses to the regulatory review, a restoration plan for Unit 5, and disaster prevention and evacuation measures are identified as initiatives.