ENES
United States United States · Laramie, WY · 41.304, -105.601 (approximate location)

L-77 Univ. Wyoming

L-77 Univ. Wyoming, a research reactor (homogeneous) in Laramie, WY, United States, with 10 W of thermal power, operated by UW College of Engineering. Decommissioned, first critical in 1959.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 17 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 isotope production, teaching and activation analysis.

Country
United States
City
Laramie, WY
Type
Homogeneous
Thermal power
10 W
Operator
UW College of Engineering
Status
Decommissioned
First criticality
1959
Purpose
Isotope production, teaching, activation analysis

Data: IAEA RRDB · updated on Sep 3, 2026

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