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Japan Japan · Saitama · 35.950, 139.550 (approximate location)

MCF

MCF, a research reactor (critical assembly) in Saitama, Japan, with 200 W of thermal power, operated by Mitsubishi Central Research Institute. Decommissioned, first critical in 1969.

It was one of the 27 research reactors Japan has had; 9 remain in operation today. It went critical 12 years after the first research reactor in Japan, JRR-1 (1957). 44 critical assemblies remain in operation today across 12 countries.

Country
Japan
City
Saitama
Type
Critical assembly
Thermal power
200 W
Operator
Mitsubishi Central Research Institute
Status
Decommissioned
First criticality
1969

Data: IAEA RRDB · updated on Sep 3, 2026

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