Effect of fuel nuclide composition on the fuel lifetime of reactor KLT-40S

Sergei V. Beliavskii, Vladimir N. Nesterov, Roman A. Laas, Alexei V. Godovikh, Olga I. Bulakh

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Fuel lifetime is a crucial parameter for small reactors used as the main part of floating power plants. Such plants have the potential to solve energy supply problems of remote regions. This article explains the methodology used to determine the effective multiplication factors and breeding ratios for reactor KLT-40S (Korpusnoi Ledokolnogo Tipa; [Shell-Type Reactor of Icebreaker Kind]) under operating conditions. The following parameters are shown to affect fuel lifetime: - effective neutron multiplication factor; - breeding ratio of nuclear fuel; - and fuel element diameter or volume of charged fuel.An increase in these parameters extends fuel lifetime. Four different fuel compositions, namely, (U238 + U235)O2, (U238 + Pu239)O2, (Th232 + U235)O2, and (Th232 + U233)O2, were examined to calculate possible fuel lifetime. The dependence of lifetime on the fuel rod diameter was also determined. The study shows that Th-U fuel cycle offers great lifetime advantages over the conventional U–Pu fuel cycle. Switching the fuel composition to (Th232 + U233)O2 can prolong fuel lifetime by 75%.

Original languageEnglish
Article number110524
JournalNuclear Engineering and Design
Publication statusPublished - 15 Apr 2020


  • Breeding ratio
  • Effective multiplication factor
  • Fuel lifetime
  • Reactor KLT-40S
  • Thorium-uranium fuel cycle
  • Uranium–plutonium fuel cycle

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Mechanical Engineering

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