United States · Idaho Falls, ID · 43.593, -112.655

ZPPR Zero Power Physics Reactor

ZPPR Zero Power Physics Reactor, a research reactor (critical assembly) in Idaho Falls, ID, United States, with 1 kW of thermal power, operated by Argonne West National Laboratory. Decommissioned, first critical in 1969.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 27 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

Idaho Falls, ID

Type

Critical assembly

Thermal power

1 kW

Operator

Argonne West National Laboratory

Status

Decommissioned

First criticality

1969

Purpose

Nuclear data

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