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United States United States · Los Alamos, NM · 35.876, -106.324

UHTREX Ultra-High Temperature Experiment

UHTREX Ultra-High Temperature Experiment, a research reactor (other) in Los Alamos, NM, United States, with 3 MW of thermal power, operated by University of California. Decommissioned, first critical in 1969.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 27 years after the first research reactor in the United States, CP-1, Chicago Pile 1 (1942). Its declared uses include innovative research.

Country
United States
City
Los Alamos, NM
Type
Other
Thermal power
3 MW
Operator
University of California
Status
Decommissioned
First criticality
1969
Purpose
Innovative research

Data: IAEA RRDB · updated on Sep 3, 2026

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