| 摘要 |
A light water reactor, comprising: a reactor pressure vessel; a core disposed in the reactor pressure vessel and loaded with a plurality of fuel assemblies including transuranic nuclides; and a coolant supplying apparatus for supplying a coolant to said core, wherein a ratio of Pu-239 in all of the transuranic nuclides included in the fuel assembly, which is loaded in the core, with a burnup of 0 is 3% or more but 45% or less; and ratios of a plurality of isotopes of the transuranic nuclides being present in the fuel assembly taken out of the core are substantially the same as ratios of the plurality of isotopes present in the fuel assembly with the burnup of 0, which is to be loaded in the core.
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