United States · Lemont, IL · 41.705, -87.984

CP-5 Chicago Pile

CP-5 Chicago Pile, a research reactor (heavy water) in Lemont, IL, United States, with 5 MW of thermal power, operated by Argonne National Laboratory. Decommissioned, first critical in 1954.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 12 years after the first research reactor in the United States, CP-1, Chicago Pile 1 (1942). 10 heavy-water research reactors remain in operation today across 7 countries. Its declared uses include training and materials testing.

Country

United States

City

Lemont, IL

Type

Heavy water

Thermal power

5 MW

Operator

Argonne National Laboratory

Status

Decommissioned

First criticality

1954

Purpose

Training, materials testing

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