Hitachi, Ltd.

Ryou Ishibashi

Hiroshi Nakano

Kinya Aota

Motoo Aoyama

Takuya Aoyagi

Junichi Sakano

Motomune Kodama

Takashi Naitou

Masao Chaki

Yoshiyuki Takamori

Masaru Sekihara

Xudong Zhang

Hideki Kita

Kazuaki Kito

Mamoru Kamoshida

Tsuneyuki Hashimoto

Seiji Yamashita

Katsuhito Takahashi

Tetsushi Hino

Toshinori Kawamura

Motoki Nakane

A nuclear reactor fuel rod is a fuel rod for a light-water reactor. The nuclear reactor fuel rod includes a fuel cladding tube and an end plug, both of which are formed of a silicon carbide material. A bonding portion between the fuel cladding tube and the end plug is formed by brazing with a predetermined metal bonding material interposed, and/or by diffusion bonding. The predetermined metal bonding material has a solidus temperature of 1200&#xb0; C. or higher. An outer surface of the bonding portion, and a portion of an outer surface of the fuel cladding tube and the end plug, which is adjacent to the outer surface of the bonding portion are covered by bonding-portion coating formed of a predetermined coating metal. The predetermined metal bonding material and the predetermined coating metal have an average linear expansion coefficient which is less than 10 ppm/K.

Nuclear reactor fuel rod and fuel assembly having bundled same

A fuel rod and a fuel assembly for light water reactors, in which crack penetration to a fuel cladding tube or an end plug can be prevented, are provided. The fuel rodincludes: a cylindrical cladding tubeformed of a ceramic base material; a connectionformed of the same material as the cladding tube; and an end plughaving a concave portionof a continuously curved surface shape adapted to house the connection. The end plugis formed of the same material as the cladding tube. A slanted surfaceformed at an end portion of the cladding tube, and a slanted surfaceformed at an end portion of the end plugare joined in contact with each other with a metallic joint material. The joint is supported by the connection

Light water reactor fuel rod having ceramic cladding tube and ceramic end plug

Provided is a structure including a first member (); a second member () disposed opposite to the first member (); and a glass layer () disposed between the first member () and the second member () so as to bond the first member () and the second member (). A glass transition point of the glass layer () is lower than a temperature of the glass layer () under operation. In the glass layer (), at least either of ceramic and metallic particlesis dispersed. In a temperature region lower than the glass transition point of the glass layer (), a thermal expansion coefficient thereof falls in between thermal expansion coefficients of the first member () and the second member (). This allows thermal strain caused within the structure () to be reduced when the structure () is operated at a higher temperature than a room temperature.

Structure, electronic element module, heat exchanger, fuel rod, and fuel assembly

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Tokyo, Japan

Ryou Ishibashi