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 | Mitsubishi 2-loopM (2-loop) in the source |
| Size | Largeabove 300 MWe |
| Coolant | Light water |
| Moderator | Light water |
| Gross capacity | 579MW |
| Net capacity (reference) | 550MW |
| Net capacity (design) | 550MW |
| Thermal output | 1,650MWt |
| NSSS vendor | Mitsubishi Heavy Industriesall vendors |
| 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utilities do not publish fuel contracts.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 | Mothballed | 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
How these sources are used, including the corrections applied on top of them and what is deliberately left blank · download the underlying data