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United Kingdom United Kingdom · Thurso · 58.580, -3.744

Dounreay MTR

Dounreay MTR, a research reactor (heavy water) in Thurso, United Kingdom, with 22.5 MW of thermal power, operated by Dounreay Nuclear Power Development Establishment. Decommissioned, first critical in 1958.

It was one of the 46 research reactors the United Kingdom has had; 1 remains in operation today. It went critical 11 years after the first research reactor in the United Kingdom, GLEEP (1947). 10 heavy-water research reactors remain in operation today across 7 countries.

Country
United Kingdom
City
Thurso
Type
Heavy water
Thermal power
22.5 MW
Operator
Dounreay Nuclear Power Development Establishment
Status
Decommissioned
First criticality
1958

Data: IAEA RRDB · updated on Sep 3, 2026

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