United States · Simi Valley, CA · 34.270, -118.746 (approximate location)

SNAP CA-4A

SNAP CA-4A, a research reactor (critical assembly) in Simi Valley, CA, United States, with 100 W of thermal power, operated by Santa Susana Field Laboratory. Decommissioned, first critical in 1962.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 20 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 materials testing.

Country

United States

City

Simi Valley, CA

Type

Critical assembly

Thermal power

100 W

Operator

Santa Susana Field Laboratory

Status

Decommissioned

First criticality

1962

Purpose

Materials testing

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