goingcritical:fukushima-daini-1Japan · Power reactor
Fukushima Daini 1
Status: Shut down reached first criticality June 17, 1981 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: Naraha/Tomioka, Fukushima
Sister plant ~12 km south of Fukushima Daiichi; the four Daini units narrowly avoided meltdown in March 2011 by restoring cooling before fuel damage. Never restarted; TEPCO decided in 2019 to decommission the site (permanent shutdown 2019-09-30).
Details
| Design | GE BWR-5 (Mark II containment) |
| Electrical output | 1,067 MWe |
Milestone history
- Announced —
- Construction start March 16, 1976
- Fuel load —
- First criticality June 17, 1981
- Grid connection July 31, 1981
- Commercial operation April 20, 1982