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United States United States · Los Alamos, NM · 35.893, -106.300 (approximate location)

SUPO Super High Power Reactor

SUPO Super High Power Reactor, a research reactor (homogeneous) in Los Alamos, NM, United States, with 35 kW of thermal power, operated by University of California. Decommissioned, first critical in 1951.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 9 years after the first research reactor in the United States, CP-1, Chicago Pile 1 (1942). 15 homogeneous reactors remain in operation today across 6 countries. Its declared uses include nuclear data measurements.

Country
United States
City
Los Alamos, NM
Type
Homogeneous
Thermal power
35 kW
Operator
University of California
Status
Decommissioned
First criticality
1951
Purpose
Nuclear data

Data: IAEA RRDB · updated on Sep 3, 2026

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