FUEL ASSEMBLY FOR NUCLEAR REACTOR Russian patent published in 2017 - IPC G21C3/16 

FIELD: power industry.

SUBSTANCE: fuel assembly for a nuclear reactor comprises a bundle of fuel rods with the first group of fuel rods and the second group of fuel rods. Each fuel rod contains a tubular casing and a stack of fuel pellets enclosed within the tubular casing. At least the main part of the fuel stack contains a nuclear fissile material containing plutonium and thorium, and is provided with an axial hole. The mentioned main part of the fuel stack of each fuel rod of the first group has the first axial hole forming the first volume, and the mentioned main part of the fuel stack of each fuel rod of the second group has the second axial hole forming the second volume. The first and second volumes are different.

EFFECT: improved efficiency of fissile plutonium application in Th-MOX-fuel for use in a fuel assembly of the same design as the fuel assembly for UOX-fuel.

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