Russia Russia · Obninsk · 55.093, 36.611

RF-GS

RF-GS, a research reactor (critical assembly) in Obninsk, Russia, with 10 W of thermal power, operated by Institute of Physics and Power Engineering. Decommissioned, first critical in 1962.

It was one of the 123 research reactors Russia has had; 57 remain in operation today. It went critical 16 years after the first research reactor in Russia, F-1 (1946). 44 critical assemblies remain in operation today across 12 countries.

Country
Russia
City
Obninsk
Type
Critical assembly
Thermal power
10 W
Operator
Institute of Physics and Power Engineering
Status
Decommissioned
First criticality
1962

Data: IAEA RRDB · updated on Sep 3, 2026

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