The KLT-40 and KLT-40M reactors are nuclear fission reactors used to power the Taymyr-class icebreakers (KLT-40M, 171 MW) and the LASH carrier Sevmorput (KLT-40, 135 MW).[1] They are pressurized water reactors (PWR) fueled by either 30–40 % or 90 %[note 1] enriched uranium-235 fuel to produce 135 to 171 MW of thermal power.[2]
The KLT-40S variant is used in the Russian floating nuclear power station Akademik Lomonosov.