United States · Chicago, IL · 41.882, -87.628 (approximate location)

ARR (L-8) Armour Foundation

ARR (L-8) Armour Foundation, a research reactor (homogeneous) in Chicago, IL, United States, with 100 kW of thermal power, operated by Illinois Institute of Technology. Decommissioned, first critical in 1956.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 14 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 materials testing.

Country

United States

City

Chicago, IL

Type

Homogeneous

Thermal power

100 kW

Operator

Illinois Institute of Technology

Status

Decommissioned

First criticality

1956

Purpose

Materials testing

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