ES
Russia Russia · St. Petersburg · 59.938, 30.309 (approximate location)

MER

MER, a research reactor (critical assembly) in St. Petersburg, Russia, with 200 W of thermal power, operated by Krylov Shipbuilding Research Institute. Shut down, first critical in 1970.

It was one of the 123 research reactors Russia has had; 57 remain in operation today. It went critical 24 years after the first research reactor in Russia, F-1 (1946). 44 critical assemblies remain in operation today across 12 countries.

Country
Russia
City
St. Petersburg
Type
Critical assembly
Thermal power
200 W
Operator
Krylov Shipbuilding Research Institute
Status
Shut down
First criticality
1970

Data: IAEA RRDB · updated on Sep 3, 2026

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