United States · Los Alamos, NM · 35.893, -106.300 (approximate location)

Big Ten

Big Ten, a research reactor (critical assembly) in Los Alamos, NM, United States, with 5 kW of thermal power, operated by Los Alamos National Security, LLC. Decommissioned, first critical in 1971.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 29 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

Los Alamos, NM

Type

Critical assembly

Thermal power

5 kW

Operator

Los Alamos National Security, LLC

Status

Decommissioned

First criticality

1971

Purpose

Innovative research, nuclear data

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