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

Musashi Reactor

Musashi Reactor, a research reactor (tRIGA) in Tokyo, Japan, with 100 kW of thermal power, operated by Musashi Institute of Technology. Shut down, first critical in 1963.

It was one of the 27 research reactors Japan has had; 9 remain in operation today. It went critical 6 years after the first research reactor in Japan, JRR-1 (1957). 36 TRIGA reactors remain in operation today across 17 countries. It is one of 65 research reactors in 20 countries that General Atomics designed or built.

Country
Japan
City
Tokyo
Type
TRIGA
Thermal power
100 kW
Operator
Musashi Institute of Technology
Design and construction
Designed by General Atomics
Status
Shut down
First criticality
1963
Purpose
Neutron radiography, teaching, training, activation analysis, geochronology, neutron capture therapy

Data: IAEA RRDB · updated on Sep 3, 2026

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