Hamaoka 4 is a 1,092 MWe (net) Chubu Electric BWR. Chubu withdrew its restart application in September 2026 after an independent committee found staff had manipulated seismic ground-motion data submitted to the NRA; Chubu's president and chairman resigned.
Background: Palisades fuel loading: Holtec restart timeline and what comes next · NRC reactor licensing process, explained
Current state
| Status | Cancelled |
| Country | Japan |
| Location | Omaezaki, Shizuoka Prefecture |
| Plant | Hamaoka |
| Unit | 4 |
| Operator | Chubu Electric Power |
| Reactor type | BWR |
| Net capacity (MWe) | 1,092 |
| Restart type | Post-Fukushima restart |
| Shut down | 2011-05-13 |
| Years offline | 15.4 |
| Regulator | Application withdrawn (documents submitted 2026-09-25); NRA had suspended the review in January 2026 |
Notes
Chubu has said it plans to reapply in future (Japan Energy Hub headline); no timetable. years offline to 2026-10-11.
Timeline
- 2011-05-13 — Hamaoka 4 entered an outage. (source)
- 2014-02-14 — Chubu applied for the NRA conformity review. (source)
- 2026-01-05 — Chubu disclosed 'inappropriate matters' in formulating the design-basis ground motion. (source)
- 2026-01-14 — The NRA paused the safety review of Hamaoka 3 and 4. (source)
- 2026-09-14 — Chubu said it would withdraw the applications after a committee found data manipulation dating to around 2012. (source)
- 2026-09-25 — Chubu submitted the documents to withdraw its applications. (source)
The timeline is append-only: corrections are added as new entries. Stated targets appear in the current-state table, never as milestones.
Related units
- Genkai Unit 3 Restarted · Japan
- Genkai Unit 4 Restarted · Japan
- Hamaoka Unit 3 Cancelled · Japan
- Higashidori Unit 1 (Tohoku Electric) Under review · Japan
- Ikata Unit 3 Restarted · Japan
- Kashiwazaki-Kariwa Unit 6 Restarted · Japan
- Kashiwazaki-Kariwa Unit 7 Approved · Japan
- Mihama Unit 3 Restarted · Japan
See all 45 units in the Nuclear Plant Restarts Tracker →
Sources
- Current Status of Nuclear Power Plants in Japan as of August 7, 2026 — Japan Atomic Industrial Forum (JAIF) (primary), checked 2026-10-11
- Nuclear Power in Japan — World Nuclear Association, checked 2026-10-11
- Chubu withdraws restart applications for Hamaoka units — World Nuclear News, checked 2026-10-11
- Chubu Electric withdraws application for Hamaoka nuclear reactors restart — Kyodo News, checked 2026-10-11
- Japan's Nuclear Power Targets from Impossible (2030) to Hardly Achievable (2040) — Renewable Energy Institute, checked 2026-10-11
- Chubu EPCO to withdraw Hamaoka 3 and 4 safety review applications, plans future reapplication — Japan Energy Hub, checked 2026-10-11