fast and stable

A sodium-cooled fast reactor is a fast neutron reactor cooled by liquid sodium.
The initials SFR in particular refer to two Generation IV reactor proposals, one based on existing liquid metal cooled reactor (LMFR) technology using mixed oxide fuel (MOX), and one based on the metal-fueled integral fast reactor.
Several sodium-cooled fast reactors have been built and some are in operation, particularly in Russia. Others are in planning or under construction. For example, in the US, TerraPower is planning to build its own reactors in partnership with GEHitachi, under the Natrium appellation.Aside from the Russian experience, Japan, India, China, France and the USA are investing in the technology.

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