METHOD FOR PRODUCTION OF NUCLEAR FUEL PELLET, FUEL ASSEMBLY, METHOD FOR PRODUCTION OF THE FUEL ASS

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Among fuel rods (13, 14, 15, 16, 17, 18, 19) which constitute a fuel assembly, low-gadolinia-added fuel rods (16, 17, 18) each of which contains an oxide of uranium having a condensation degree of more than 5% contain a Gd composite oxide. The Gd composite oxide is an oxide containing gadolinium and a rare earth element A other than gadolinium and represented by the chemical formula A1-XGdXO2-0.5X or A1-XGdXO1.5. The rare earth element A may be cerium (Ce), lanthanum (La), erbium (Er) or the like.