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Japan Japan · Tokyo · 35.690, 139.692 (approximate location)

DCA

DCA, a research reactor (critical assembly) in Tokyo, Japan, with 1 kW of thermal power, operated by JAEA. Shut down, 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. Its declared uses include teaching and training.

Country
Japan
City
Tokyo
Type
Critical assembly
Thermal power
1 kW
Operator
JAEA
Status
Shut down
First criticality
1969
Purpose
Teaching, training

Data: IAEA RRDB · updated on Sep 3, 2026

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