Kabushiki Kaisha Toshiba

Toshiba Energy Systems & Solutions Corporation

Yasuo Morishima

Jun Suzuki

Kunihiko Kinugasa

Hajime Mori

Masato Okamura

Kenji Yamazaki

Daiki Tanaka

Akio Sayano

Yumiko Abe

Minoru Obata

Yoshinori Katayama

Tetsuji Kaneko

Wataru Kono

Norihisa Saito

Yuusuke Watanabe

Takahiro Hayashi

Yoshiki Ishizaki

A nickel-base alloy welding material according to an embodiment comprises: Cr (chromium) larger than 30.0% and less than or equal to 36.0% by mass; C (carbon) less than or equal to 0.050% by mass; Fe (iron) larger than or equal to 1.00% and less than or equal to 3.00% by mass; Si (silicon) less than or equal to 0.50% by mass; Nb (niobium)+Ta (tantalum) less than or equal to 3.00% by mass; Ti (titanium) less than or equal to 0.70% by mass; Mn (manganese) larger than or equal to 0.10% and less than or equal to 3.50% by mass; Cu (copper) less than or equal to 0.5% by mass, and a remainder is Ni and unavoidable impurities.

Nickel-base alloy welding material, welding material for nuclear reactor, nuclear power apparatus and nuclear power structure, and method of repairing nuclear power apparatus and nuclear power structure

A coating of niobium oxide, zirconium titanate, or nickel titanate is formed on at least a part of a surface of a jet pump member constituting a jet pump serving as a reactor internal structure of a boiling water reactor. Further, a solution containing, e.g., a niobium compound is applied to at least a part of the surface of the jet pump member constituting the jet pump, and the jet pump member coated with the solution is heat-treated to form a coating of, e.g., niobium oxide. With this configuration, the jet pump member constituting the jet pump of the boiling water reactor is provided such that deposition of crud can be sufficiently suppressed on the jet pump member.

Reactor internal structure and method of manufacturing the same

A jet pump including a riser as a coolant supply tube, an inlet mixer forming a turn-around path for the coolant, a diffuser, and a jet pump beam provided with a bolt fixing device is disclosed. The bolt fixing device includes: a head bolt of a jet pump beam for pushing and supporting the inlet mixer from an upper side of the riser, the head bolt being provided with a polygonal head portion; a lock cap provided on the polygonal head portion of the head bolt; a body housing disposed on an upper surface of the jet pump beam and adapted to accommodate the lock pin; a plurality of tapered external teeth formed on an outer peripheral side surface of the lock cap; and a plurality of internal tooth-shaped grooves formed to the body housing to fix the head bolt of the jet pump beam.

Bolt fixing device of jet pump beam

Growing community of inventors

Yokohama, Japan

Yasuo Morishima