Tomari nuclear power plant 1
Mothballed Japan
Gross capacity
579MW
Tomari nuclear power plant 1 is a pressurised water reactor unit at Tomari nuclear power plant in Japan rated at 579 MW gross. It is mothballed. Commercial operation began 22 Jun 1989.
Specification
| Reactor type | Pressurised water reactor (PWR) |
|---|---|
| Model | M (2-loop) |
| Size class | Large |
| Coolant | Light water |
| Moderator | Light water |
| Gross capacity | 579MW |
| Net capacity (reference) | 550MW |
| Net capacity (design) | 550MW |
| Thermal output | 1,650MWt |
| Typical enrichment | 3–5% U-235 |
Ownership & location
| Site | Tomari nuclear power plant |
|---|---|
| Unit | 1 |
| Country | Japan |
| Owner | Hokkaido Electric Power Co Inc100% |
| Operator | Hokkaido Electric Power |
| Coordinates | 43.0367, 140.5125 |
Fuel chain for this unit
Fuel form
Uranium dioxide pellets in zirconium-alloy cladding
Enrichment
3–5% U-235
Who makes this assembly
- China National Nuclear Corporation PWR fuel assemblies
- ENUSA Industrias Avanzadas PWR and BWR fuel assemblies
- Framatome PWR fuel assemblies
- KEPCO Nuclear Fuel PWR fuel assemblies
- Mitsubishi Heavy Industries PWR fuel assemblies
- Westinghouse Electric Company PWR fuel assemblies
Upstream
Enriched fuel means this unit sits downstream of five conversion plants and four enrichment operators holding 88% of world capacity between the top three.
Fabricator capability is recorded against reactor type and model line, not against named units —
utilities do not publish fuel contracts. See the fuel chain.
Timeline
- 18 Apr 1985Construction start
- 16 Nov 1988First criticality
- 6 Dec 1988Grid connection
- 22 Jun 1989Commercial operation
Other units at Tomari nuclear power plant
| Unit | Status | Gross MW |
|---|---|---|
| Tomari nuclear power plant 2 | Mothballed | 579 |
| Tomari nuclear power plant 3 | Under construction | 912 |
Other M (2-loop) units
7 units worldwide share this model designation.
| Unit | Country | Status | Gross MW |
|---|---|---|---|
| Genkai nuclear power plant 1 | Japan | Retired | 559 |
| Genkai nuclear power plant 2 | Japan | Retired | 559 |
| Ikata nuclear power plant 1 | Japan | Retired | 566 |
| Ikata nuclear power plant 2 | Japan | Retired | 566 |
| Mihama nuclear power plant 2 | Japan | Retired | 500 |
| Tomari nuclear power plant 2 | Japan | Mothballed | 579 |
Sources
- Global Nuclear Power Tracker, Global Energy Monitor, August 2026 release — CC BY 4.0 · retrieved 2026-09-06 · this unit last researched by GEM on 2026-06-24
- GEM.wiki entry (further reading) — CC BY-SA 4.0 — linked, not quoted