United States United States · San Diego, CA · 32.912, -117.130 (approximate location)

Thermionic Critical Experiment

Thermionic Critical Experiment, a research reactor (critical assembly) in San Diego, CA, United States, with 200 W of thermal power, operated by John Jay Hopkins Laboratory for Pure and Applied Science. Decommissioned, first critical in 1968.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 26 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 materials testing.

Country
United States
City
San Diego, CA
Type
Critical assembly
Thermal power
200 W
Operator
John Jay Hopkins Laboratory for Pure and Applied Science
Status
Decommissioned
First criticality
1968
Purpose
Materials testing

Data: IAEA RRDB · updated on Sep 3, 2026

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