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

SPERT-3 Special Power Excursion Test

SPERT-3 Special Power Excursion Test, a research reactor (pool) in Idaho Falls, ID, United States, with 60 MW of thermal power, operated by Phillips Petroleum Company. 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). 48 pool-type reactors remain in operation today across 28 countries. Its declared uses include nuclear data measurements and materials testing.

Country
United States
City
Idaho Falls, ID
Type
Pool
Thermal power
60 MW
Operator
Phillips Petroleum Company
Status
Decommissioned
First criticality
1958
Purpose
Nuclear data, materials testing

Data: IAEA RRDB · updated on Sep 3, 2026

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