ANS - American Nuclear Society

03/19/2024 | News release | Distributed by Public on 03/19/2024 14:18

Clementine—The world’s first fast neutron reactor

In March 1949-75 years ago this month-the 25-kilowatt reactor known as Clementine reached full power. As an experimental reactor, it had a rather long and successful run. It was the world's first fast neutron (high-energy) reactor and operated from initial criticality in 1946 to final shutdown in 1952.

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