Mitsubishi 4-loop
The Mitsubishi 4-loop is a Generation II pressurised water reactor from Mitsubishi Heavy Industries. 4 units are operating and 0 are under construction, out of 5 on record.
Mitsubishi's largest PWR, at Ohi 3 and 4 and Genkai 3 and 4. It is the immediate technical ancestor of the APWR, which Mitsubishi offered in the United States and Japan and never built. Mitsubishi is now the principal supplier to the Japanese restart programme rather than a builder of new plants.
| Vendor | Mitsubishi Heavy Industries |
|---|---|
| Reactor type | Pressurised water reactor (PWR) |
| Generation | II |
| Capacity range | 1150–1250 MWe gross |
| Also recorded as | M (4-loop)in the source tracker |
| Coolant | Light water |
| Typical enrichment | 3–5% U-235 |
| Japan | 5 units, 4 operating |
|---|
How long it took to build
Years from construction start to grid connection, for units with both dates on record. The median across 4 finished units is 4.2 years.
| Unit | Country | Started | Connected | Years |
|---|---|---|---|---|
| Ohi nuclear power plant 3 | Japan | 1987 | 1991 | 3.7 |
| Ohi nuclear power plant 4 | Japan | 1988 | 1992 | 4.0 |
| Genkai nuclear power plant 3 | Japan | 1988 | 1993 | 5.0 |
| Genkai nuclear power plant 4 | Japan | 1992 | 1996 | 4.3 |
All Mitsubishi 4-loop units
| Unit | Country | Status | Gross MW | Online |
|---|---|---|---|---|
| Genkai nuclear power plant 3 | Japan | 1,180 | 1994 | |
| Genkai nuclear power plant 4 | Japan | 1,180 | 1997 | |
| Ohi nuclear power plant 3 | Japan | 1,180 | 1991 | |
| Ohi nuclear power plant 4 | Japan | 1,180 | 1993 | |
| Tsuruga nuclear power plant 2 | Japan | Mothballed | 1,160 | 1987 |
Sources
- Mitsubishi 4-loop, vendor documentation
- Global Nuclear Power Tracker, Global Energy Monitor, August 2026 release , CC BY 4.0 · retrieved 2026-09-06
How these sources are used, including the corrections applied on top of them and what is deliberately left blank · download the underlying data