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United States United States · Oak Ridge, TN · 35.928, -84.317

X-10 Pile, Oak Ridge Graphite

X-10 Pile, Oak Ridge Graphite, a research reactor (graphite) in Oak Ridge, TN, United States, with 3.8 MW of thermal power, operated by Union Carbide Corporation. Decommissioned, first critical in 1943.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 1 year after the first research reactor in the United States, CP-1, Chicago Pile 1 (1942). 4 graphite-moderated research reactors remain in operation today across 3 countries. Its declared uses include isotope production and nuclear data measurements.

Country
United States
City
Oak Ridge, TN
Type
Graphite
Thermal power
3.8 MW
Operator
Union Carbide Corporation
Status
Decommissioned
First criticality
1943
Purpose
Isotope production, nuclear data

Data: IAEA RRDB · updated on Sep 3, 2026

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