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United States United States · Santa Barbara, CA · 34.430, -119.728 (approximate location)

L-77 UCSB

L-77 UCSB, a research reactor (homogeneous) in Santa Barbara, CA, United States, with 10 W of thermal power, operated by UCSB Dept. of Chemistry & Nuclear Engineering. Decommissioned, first critical in 1975.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 33 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 teaching and activation analysis.

Country
United States
City
Santa Barbara, CA
Type
Homogeneous
Thermal power
10 W
Operator
UCSB Dept. of Chemistry & Nuclear Engineering
Status
Decommissioned
First criticality
1975
Purpose
Teaching, activation analysis

Data: IAEA RRDB · updated on Sep 3, 2026

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