Tokai nuclear power plant
Tokai nuclear power plant is a nuclear site in Japan with 2 units on record. None is currently operating.
Units
| Unit | Status | Type | Model | Gross MW | Online |
|---|---|---|---|---|---|
| Unit 1 | Retired | GCR | MAGNOX | 166 | 1966 |
| Unit 2 | Mothballed | BWR | BWR-5 | 1,100 | 1978 |
Unit by unit
Each unit's rating, type and milestone dates as recorded by the Global Nuclear Power Tracker, with any correction we made to it. A dash or "not disclosed" means the source does not give the value.
Tokai nuclear power plant 1 Retired
| Reactor type | Gas-cooled reactor (GCR) |
|---|---|
| Model | MAGNOX |
| Size class | Small |
| Gross capacity | 166MW |
| Net capacity | 137MW |
| Thermal output | 587MWt |
| Enrichment | Natural uranium to 2.5–3.5% U-235no enrichment required |
| NSSS vendor | not on record |
| Owner | Japan Atomic Power Co100% |
| Operator | Japan Atomic Power |
| Construction start | 1 Mar 1961 |
|---|---|
| First criticality | 4 May 1965 |
| Grid connection | 10 Nov 1965 |
| Commercial operation | 25 Jul 1966 |
| Permanent shutdown | 31 Mar 1998 |
Tokai nuclear power plant 2 Mothballed
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 Tokai-2 (BWR, 1,100 MWe) among the operable units, commercial operation 1978, in outage since 2011.03.11. 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 Tokai-2 (BWR, 1,100 MWe) among the operable units, commercial operation 1978, in outage since 2011.03.11. 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:
2026-01-01 → 1978
· 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 Tokai-2 (BWR, 1,100 MWe) among the operable units, commercial operation 1978, in outage since 2011.03.11. 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:
2026 → 1978
· Japan Atomic Industrial Forum, Current Status of Nuclear Power Plants in Japan (as of 7 August 2026)
· verified 2026-10-22
| Reactor type | Boiling water reactor (BWR) |
|---|---|
| Model | BWR-5 |
| Size class | Large |
| Gross capacity | 1,100MW |
| Net capacity | 1,060MW |
| Thermal output | 3,293MWt |
| Enrichment | 3–5% U-235 |
| NSSS vendor | GE Vernova Hitachi Nuclear Energy |
| Owner | Japan Atomic Power Co100% |
| Operator | Japan Atomic Power |
| Construction start | 3 Oct 1973 |
|---|---|
| First criticality | 18 Jan 1978 |
| Grid connection | 13 Mar 1978 |
| Commercial operation | 1978 |
Tokai nuclear power plant in context
The one unit with both construction and grid dates on record took 4.7 years from construction start to grid connection; the median across all reactors connected in the 1960s is 5.0 years.
The nearest other tracked nuclear sites are Kashiwazaki Kariwa nuclear power plant (211 km) and Onagawa nuclear power plant (234 km).
Build time by unit
| Unit | Construction start | Grid connection | Years | Fleet median, same decade |
|---|---|---|---|---|
| Unit 1 | 1961 | 1965 | 4.7 | 5.0 (1960s) |
Nearest tracked nuclear sites
| Site | Country | Distance | Operating GW gross |
|---|---|---|---|
| Kashiwazaki Kariwa nuclear power plant | Japan | 211 km | 1.4 |
| Onagawa nuclear power plant | Japan | 234 km | 0.8 |
How these are worked out: ranks use gross operating capacity; ages count from the start-up year on record, as on the age page; build times run from construction start to grid connection, as on the build-times page; ratings are the tracker's net and design net capacity, as on the uprates page. Distances are straight-line between exact positions, so a site with only an approximate position gets none. A unit missing a date or a rating is left out of the figure that needs it.
| Location | Hitachinaka, Ibaraki, Japan |
|---|---|
| Coordinates | 36.4215, 140.6028 |
| Elevation | about 5 mabove sea level |
| Setting | On the sea coast, 0.7 km from the water |
| Region | Eastern Asia |
| Units by status | Retired: 1 Mothballed: 1 |
Elevation is read at the listed coordinates from a 30 m terrain model (SRTM 30 m). Two independent models differ by a median of 6 m across our plants and by up to about 40 m on steep or coastal ground, and a point on a shoreline can read as sea level. Distance to the water is measured to a generalised 1:10 million coastline, so a few kilometres or less is not resolved. This is context, not a design-basis or flood-risk figure.
| Owners | Japan Atomic Power Co |
|---|---|
| Operators | Japan Atomic Power |
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Sources
- Global Nuclear Power Tracker, Global Energy Monitor, August 2026 release , CC BY 4.0 · retrieved 2026-09-06
- 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