Materials Testing Reactor

The Materials Testing Reactor (MTR) was an early nuclear reactor specifically designed to facilitate the conception and the design of future reactors. It produced much of the foundational irradiation data that underlies the nuclear power industry. It operated in Idaho at the National Reactor Testing Station from 1952 to 1970.

Materials Testing Reactor (MTR)
Early reactor that provided foundational information supporting the nuclear industry
Generation1
Reactor conceptLight water reactor
StatusDecommissioned
LocationNational Reactor Testing Station, Idaho
Coordinates43°35′10″N 112°57′46″W
Main parameters of the reactor core
Fuel (fissile material)235U
Fuel stateU-Al plates
Neutron energy spectrumThermal
Primary control methodCadmium
Primary moderatorLight water
Primary coolantWater
Reactor usage
Primary usePower reactor research, radioisotope production
Power (thermal)40 MWt
Criticality (date)March 31, 1952
Operator/ownerPhillips Petroleum Company
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