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United States United States · Idaho Falls, ID · 43.533, -112.945 (approximate location)

ML-1 Mobile Low Power Reactor

ML-1 Mobile Low Power Reactor, a research reactor (other) in Idaho Falls, ID, United States, with 3.3 MW of thermal power, operated by Aerojet General Nucleonics. Decommissioned, first critical in 1961.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 19 years after the first research reactor in the United States, CP-1, Chicago Pile 1 (1942). Its declared uses include nuclear data measurements and materials testing.

Country
United States
City
Idaho Falls, ID
Type
Other
Thermal power
3.3 MW
Operator
Aerojet General Nucleonics
Status
Decommissioned
First criticality
1961
Purpose
Nuclear data, materials testing

Data: IAEA RRDB · updated on Sep 3, 2026

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