United States · Idaho Falls, ID · 43.494, -112.006 (approximate location)

ZPR-3 Argonne

ZPR-3 Argonne, a research reactor (critical assembly) in Idaho Falls, ID, United States, with 1 W of thermal power, operated by Idaho National Reactor Testing Station. Decommissioned, first critical in 1955.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 13 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 innovative research and nuclear data measurements.

Country

United States

City

Idaho Falls, ID

Type

Critical assembly

Thermal power

1 W

Operator

Idaho National Reactor Testing Station

Status

Decommissioned

First criticality

1955

Purpose

Innovative research, nuclear data

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