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

PCA Plasma Core Assembly

PCA Plasma Core Assembly, a research reactor (critical assembly) in Los Alamos, NM, United States, with 100 W of thermal power, operated by University of California. Decommissioned, first critical in 1974.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 32 years after the first research reactor in the United States, CP-1, Chicago Pile 1 (1942). 44 critical assemblies remain in operation today across 12 countries. Its declared uses include nuclear data measurements and materials testing.

Country
United States
City
Los Alamos, NM
Type
Critical assembly
Thermal power
100 W
Operator
University of California
Status
Decommissioned
First criticality
1974
Purpose
Nuclear data, materials testing

Data: IAEA RRDB · updated on Sep 3, 2026

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