Importance

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Abstract

A core of a light water reactor having a plurality of fuel assemblies, which are loaded in said core, having nuclear fuel material containing a plurality of isotopes of transuranium nuclides, an upper blanket zone, a lower blanket zone, and a fissile zone, in which the transuranium nuclides are contained, disposed between the upper blanket zone and the lower blanket zone;

wherein a ratio of Pu-239 in all the transuranium nuclides contained in the loaded fuel assembly is in a range of 40 to 60% when burnup of the fuel assembly is 0;sum of a height of the lower blanket zone and a height of the upper blanket zone is in a range of 250 to 600 mm; andthe height of said lower blanket zone is in a range of 1.6 to 12 times the height of the upper blanket zone.

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First Claim