KLT-40 reactor

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The KLT-40 family are nuclear fission reactors originating from OK-150 and OK-900 ship reactors. KLT-40 were developed 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. It was developed by OKBM Afrikantov and produced by NMZ. The KLT-40S produces 150 MW thermal (about 52 MWe at 35% efficiency). It uses low-enriched uranium (LEU) fuel enriched below 20%, averaging at 14.1% enrichment, and has a fuel cycle of 3 years.[3]

The KLT-40 design was further improved and evolved into RITM-200 family of SMR.


  1. ^ 90 % according to information provided to Norwegian government in 1990, 30–40 % according to Bellona Foundation citing communication with Murmansk Shipping Company. (Diakov, Anatoli C. et al.)


  1. ^ Nuclear icebreakers Archived 2011-04-13 at the Wayback Machine. Bellona Foundation, 18 June 1997. Retrieved 2011-11-29.
  2. ^ Diakov, Anatoli C.; et al. (2006), "Feasibility of Converting Russian Icebreaker Reactors from HEU to LEU Fuel" (PDF), Science and Global Security, Taylor & Francis, Inc., 14: 33–48, doi:10.1080/08929880600620575, retrieved 2011-11-26
  3. ^ "KLT-40S" (PDF). Advanced Reactor Information System. IAEA. 2013. Retrieved 10 November 2021.

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