United States · Mayagüez, Puerto Rico · 18.201, -67.143 (approximate location)

L-77 Univ. Puerto Rico

L-77 Univ. Puerto Rico, a research reactor (homogeneous) in Mayagüez, Puerto Rico, United States, with 10 kW of thermal power, operated by Center for Energy and Environmental Research (CEER). 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 and teaching.

Country

United States

City

Mayagüez, Puerto Rico

Type

Homogeneous

Thermal power

10 kW

Operator

Center for Energy and Environmental Research (CEER)

Status

Decommissioned

First criticality

1959

Purpose

Isotope production, teaching

See also: every research reactor in United States · How research reactors work