United States · Lemont, IL · 43.533, -112.945 (approximate location)

ZPR-9 Argonne

ZPR-9 Argonne, a research reactor (critical assembly) in Lemont, IL, United States, with 1 W of thermal power, operated by US DOE. Decommissioned, first critical in 1964.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 22 years after the first research reactor in the United States, CP-1, Chicago Pile 1 (1942). 44 critical assemblies remain in operation today across 12 countries. Its declared uses include nuclear data measurements.

Country

United States

City

Lemont, IL

Type

Critical assembly

Thermal power

1 W

Operator

US DOE

Status

Decommissioned

First criticality

1964

Purpose

Nuclear data

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