In November 2024 Rosatom completed the removal of all spent fuel of naval reactors from the Gremikha base at the Northern Fleet. According to the report, the final, eleventh, spent fuel assembly, belonged to the OK-550KM prototype reactor that was delivered to Gremikha in 2017 from the Scientific Research Technological Institute (NITI) in Sosnovy Bor, where it was deployed as part of the KM-1 facility. Reactors in question are liquid-metal cooled fast neutron reactors that used uranium-beryllium fuel with the enrichment of more than 90%. The removal of spent fuel assemblies began in 2014. The spent fuel was transferred to the Mayak Plant where it will be reprocessed.