MANUFACTURING METHOD OF NUCLEAR FUEL PELLET, FUEL ASSEMBLY FOR NUCLEAR REACTOR AND MANUFACTURING METHOD THEREOF AND URANIUM POWDER

摘要

Among fuel rods constituting a fuel assembly, Gd compound oxide is added to low Gd containing fuel rods that containing uranium dioxide of which enrichment exceeds 5 wt %. The Gd compound oxide is oxide of gadolinium and rare earth element A except for gadolinium and is expressed as a chemical formula A_1-xGd_xO_2-0.5x or a chemical formula A_1-xGd_xO_1.5. As the rare earth element A, cerium Ce, lanthanum La or erbium Er can be used.