United States · Las Vegas, NV · 36.167, -115.149 (approximate location)

Little Eva

Little Eva, a research reactor (critical assembly) in Las Vegas, NV, United States, operated by Nevada Test Site. Decommissioned, first critical in 1952.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 10 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

Las Vegas, NV

Type

Critical assembly

Thermal power

critical

Operator

Nevada Test Site

Status

Decommissioned

First criticality

1952

Purpose

Nuclear data

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