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United States United States · Idaho Falls, ID · 43.518, -112.824

SL-1 Stationary Low Power

SL-1 Stationary Low Power, a research reactor (other) in Idaho Falls, ID, United States, with 3 MW of thermal power, operated by Combustion Engineering. Decommissioned, first critical in 1958.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 16 years after the first research reactor in the United States, CP-1, Chicago Pile 1 (1942). Its declared uses include training.

Country
United States
City
Idaho Falls, ID
Type
Other
Thermal power
3 MW
Operator
Combustion Engineering
Status
Decommissioned
First criticality
1958
Purpose
Training

Data: IAEA RRDB · updated on Sep 3, 2026

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