US Army Corps of Engineers

SM-1, Ft. Belvoir, Virginia
SM-1, Ft. Belvoir, Virginia. The SM-1 (Stationary, Medium Power, Prototype) nuclear reactor was the first built by the Army Nuclear Power Program. The SM-1 went critical in April 1957 and was the first reactor to supply power to the commercial power grid. The SM-1 was shut down and deactivated in 1973.

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