Ohi 1 and 2, two 1,175 MWe ice-condenser PWRs, became in 2017-18 the first post-Fukushima retirements of Japanese reactors over 1,000 MWe. Kansai has been dismantling secondary-system equipment since April 2020 under a plan approved in December 2019.
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Current state
| Status | Active dismantling |
| Country | Japan |
| Location | Ohi, Fukui Prefecture |
| Site | Ohi |
| Units | Unit 1, Unit 2 |
| Unit count | 2 |
| Reactor types | PWR |
| Owner / licensee | Kansai Electric Power |
| Strategy | Immediate dismantling |
| Final shutdown | 2018-03-01 |
| Decommissioning start | 2020-04-01 |
| Notable issue | Only Japanese reactors with ice-condenser containment; upgrading the containment walls was deemed uneconomic. |
Notes
NucNet: Kansai expects to spend about $1.1bn to dismantle both units (currency-converted figure, so cost estimate not recorded). final shutdown uses the date of the decommissioning application (formal retirement).
Timeline
- 2017-12-22 — Kansai decided not to seek restart of Ohi 1 and 2. (source)
- 2018-03-01 — Kansai applied for approval to decommission the units. (source)
- 2019-12 — The NRA approved the Ohi 1 and 2 decommissioning plan. (source)
- 2020-04-01 — Dismantling of secondary-system equipment began at both units. (source)
The timeline is append-only: corrections are added as new entries. Stated targets appear in the current-state table, never as milestones.
Related sites
- Biblis Nuclear Power Plant (Units A and B) Active dismantling · Germany
- Brokdorf Nuclear Power Plant (KBR) Active dismantling · Germany
- Brunsbüttel Nuclear Power Plant (KKB) Active dismantling · Germany
- Chinshan Nuclear Power Plant Fuel removal · Taiwan
- Chooz A Active dismantling · France
- Crystal River Unit 3 Site restoration · United States
- Doel Nuclear Power Plant (Units 1-3) Shut down · Belgium
- Dounreay (DFR and PFR fast reactors) Active dismantling · United Kingdom
See all 72 sites in the Nuclear Decommissioning Tracker →
Sources
- Kansai applies to decommission Ohi 1 and 2 — World Nuclear News, checked 2026-10-11
- Regulator Approves Plan To Decommission Ohi-1 And -2 — NucNet, checked 2026-10-11
- Kansai Electric Power Nuclear Plant Operations Update (as of June 30, 2026) — Kansai Electric Power IR (via BigGo Finance), checked 2026-10-11