The BN-reactor is a type of sodium-cooled fast breeder reactor built in Russia from the company OKBM Afrikantov.
Two BN-reactors are to date (2015) the only commercial fast breeder reactors in operation worldwide.
In operation since 1980 with an availability factor of over 74% it is together with Phénix one of the most successful fast breeder reactors ever built.
It became first critical in 2015, electricity production was planned starting in 2017, but began in December 2015.
The BN-1200 is a 1200MW reactor project planned to reach the safety and efficiency goals of the Generation IV.