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United States United States · Oak Ridge, TN · 35.918, -84.304

HFIR

HFIR, a research reactor (tank) in Oak Ridge, TN, United States, with 85 MW of thermal power, operated by Ornl- Research Reactors Division. Operating, first critical in 1965.

It is one of the 48 research reactors operating in the United States. It went critical 23 years after the first research reactor in the United States, CP-1, Chicago Pile 1 (1942). It is one of 36 tank-type reactors operating worldwide, spread across 23 countries. Its declared uses include isotope production, neutron scattering, neutron radiography and teaching.

Country
United States
City
Oak Ridge, TN
Type
Tank
Thermal power
85 MW
Operator
Ornl- Research Reactors Division
Status
Operating
First criticality
1965
Purpose
Isotope production, neutron scattering, neutron radiography, teaching, training, activation analysis, innovative research, materials testing

Data: IAEA RRDB · updated on Sep 3, 2026

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