| abstract |
The present invention uses a SiC material as the material of the fuel cladding tube and the end plug, and bundles the reactor fuel rod having both airtightness, heat resistance, and corrosion resistance at the joint portion between the fuel cladding tube and the end plug. An object is to provide a fuel assembly. A nuclear fuel rod according to the present invention is a fuel rod for a light water reactor, and has a fuel cladding tube and an end plug both made of a silicon carbide material, and a joint portion between the fuel cladding tube and the end plug is a solid rod. Formed by brazing and / or diffusion bonding through a predetermined metal bonding material having a phase line temperature of 1200 ° C. or more, and the fuel cladding tube adjacent to the outer surface of the bonding portion and the bonding outer surface; and A part of the outer surface of the end plug is covered with a joint coating made of a predetermined coating metal, and the predetermined metal bonding material and the predetermined coating metal have an average coefficient of linear expansion of 10 ppm / K. Is less than. |