goingcritical:ohma-1Japan · Power reactor
Ohma-1
Status: Under construction Reactor status full glossary → Announced Publicly announced — a site and design are proposed, but construction has not begun. Site preparation Early site and civil works are under way; the first safety-related ("nuclear") concrete has not yet been poured. Under construction Formal construction has begun, marked by the first nuclear concrete. Fuel loaded Nuclear fuel has been loaded into the core. The reactor is fuelled but has not yet gone critical. Critical Has reached first criticality — a self-sustaining chain reaction, usually at low power — but is not yet connected to the grid. Grid connected Synchronised to the electrical grid and exporting power for the first time, but still in commissioning and power-ascension testing — not yet in commercial service. In commercial operation — the operator has formally declared the unit in regular commercial service. Shut down Permanently shut down and no longer generating; may be defuelled, undergoing decommissioning, or preserved in place. Canceled Abandoned before completion.
Site: Ohma, Aomori Prefecture
Designed as the world's first commercial reactor able to run a full MOX core
No firm startup date; construction suspended after Fukushima, resumed 2012, and NRA safety screening (ongoing since 2014) must conclude before completion. Startup targets have slipped repeatedly from the original 2014.
Details
| Design | ABWR (designed for full-MOX core) |
| Electrical output | 1,328 MWe |
Milestone history
- Announced —
- Construction start May 2010
- Fuel load —
- First criticality —
- Grid connection —
- Commercial operation —