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The authors propose an approach to the calculation of the levelized unit fuel cost ( LUFC ) of electricity generation for a fast reactor in a two-component nuclear energy system (NES) with regard for plutonium production. The approach is based on taking into account the additional economic effect, which can be achieved through the sale at the market price of the natural uranium released due to the substitution of thermal reactors by fast reactors with MOX fuel based on the plutonium bred in a fast reactor. This requires considering simultaneously the reactor parts of the fuel cycle for fast and thermal reactors. Relationships have been obtained which connect the key neutronic and fuel characteristics with the NPP and fuel cycle economic performance. The described methodology was used for the computational study of the  LUFC  for a fast sodium-cooled reactor. Calculations have shown that, in the considered case, taking into account the plutonium production leads to the  LUFC  reduction by nearly half and, therefore, to a major decrease in the total unit cost of electricity generation (levelized cost of electricity or  LCOE ).

System levelized fuel cost of electricity generation in a two-component nuclear energy system with a closed uranium-plutonium NFC