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
See also: every research reactor in United States · How research reactors work
Data: IAEA RRDB · updated on Sep 3, 2026