Tomari nuclear power plant 3
Tomari nuclear power plant 3 is a pressurised water reactor unit at Tomari nuclear power plant in Japan rated at 912 MW gross. It is mothballed. Commercial operation began 2009.
GNPT records the unit as under construction, with a commercial operation date in the future. The Japan Atomic Industrial Forum's table of the status of Japan's nuclear power plants, as of 7 August 2026, lists Tomari-3 (PWR, 912 MWe) among the operable units, commercial operation 2009, in outage since 2012.05.05. Only Ohma, Higashidori-1 and Shimane-3 are in its under-construction table. The unit is complete and idle, like its sister units already recorded as mothballed, so it is not under construction. The commercial operation year is the JAIF's; the exact day is not given there, so only the year is recorded.
status:
construction → mothballed
· Japan Atomic Industrial Forum, Current Status of Nuclear Power Plants in Japan (as of 7 August 2026)
· verified 2026-10-22
GNPT records the unit as under construction, with a commercial operation date in the future. The Japan Atomic Industrial Forum's table of the status of Japan's nuclear power plants, as of 7 August 2026, lists Tomari-3 (PWR, 912 MWe) among the operable units, commercial operation 2009, in outage since 2012.05.05. Only Ohma, Higashidori-1 and Shimane-3 are in its under-construction table. The unit is complete and idle, like its sister units already recorded as mothballed, so it is not under construction. The commercial operation year is the JAIF's; the exact day is not given there, so only the year is recorded.
commercial_operation:
2027-01-01 → 2009
· Japan Atomic Industrial Forum, Current Status of Nuclear Power Plants in Japan (as of 7 August 2026)
· verified 2026-10-22
GNPT records the unit as under construction, with a commercial operation date in the future. The Japan Atomic Industrial Forum's table of the status of Japan's nuclear power plants, as of 7 August 2026, lists Tomari-3 (PWR, 912 MWe) among the operable units, commercial operation 2009, in outage since 2012.05.05. Only Ohma, Higashidori-1 and Shimane-3 are in its under-construction table. The unit is complete and idle, like its sister units already recorded as mothballed, so it is not under construction. The commercial operation year is the JAIF's; the exact day is not given there, so only the year is recorded.
start_year:
2027 → 2009
· Japan Atomic Industrial Forum, Current Status of Nuclear Power Plants in Japan (as of 7 August 2026)
· verified 2026-10-22
| Reactor type | Pressurised water reactor (PWR) |
|---|---|
| Model | Mitsubishi 3-loopM (3-loop) in the source |
| Size | Largeabove 300 MWe |
| Coolant | Light water |
| Moderator | Light water |
| Gross capacity | 912MW |
| Net capacity (reference) | 866MW |
| Net capacity (design) | 866MW |
| Thermal output | 2,660MWt |
| NSSS vendor | Mitsubishi Heavy Industriesall vendors |
| Typical enrichment | 3–5% U-235 |
| Site | Tomari nuclear power plant |
|---|---|
| Unit | 3 |
| Country | Japan |
| Owner | Hokkaido Electric Power Co Inc100% |
| Operator | Hokkaido Electric Power |
| Coordinates | 43.0367, 140.5125 |
- 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
Enriched fuel means this unit sits downstream of five conversion plants and four enrichment operators holding 88% of world capacity between the top three.
Timeline
- 18 Nov 2004Construction start
- 3 Mar 2009First criticality
- 20 Mar 2009Grid connection
- 2009Commercial operation
Other units at Tomari nuclear power plant
| Unit | Status | Gross MW |
|---|---|---|
| Tomari nuclear power plant 1 | Mothballed | 579 |
| Tomari nuclear power plant 2 | Mothballed | 579 |
Other M (3-loop) units
9 units worldwide share this model designation.
| Unit | Country | Status | Gross MW |
|---|---|---|---|
| Ikata nuclear power plant 3 | Japan | 890 | |
| Mihama nuclear power plant 3 | Japan | 826 | |
| Sendai nuclear power plant 1 | Japan | 890 | |
| Sendai nuclear power plant 2 | Japan | 890 | |
| Takahama nuclear power plant 1 | Japan | 826 | |
| Takahama nuclear power plant 2 | Japan | 826 | |
| Takahama nuclear power plant 3 | Japan | 870 | |
| Takahama nuclear power plant 4 | Japan | 870 |
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