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United States United States · Los Angeles · 34.052, -118.244 (approximate location)

L-47 Atomics International

L-47 Atomics International, a research reactor (homogeneous) in Los Angeles, United States, with 5 W of thermal power, operated by North American Aviation. Decommissioned, first critical in 1957.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 15 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 materials testing.

Country
United States
City
Los Angeles
Type
Homogeneous
Thermal power
5 W
Operator
North American Aviation
Status
Decommissioned
First criticality
1957
Purpose
Materials testing

Data: IAEA RRDB · updated on Sep 3, 2026

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