Kabushiki Kaisha Toshiba

Masakazu Abura

Hajime Mori

Kunihiko Kinugasa

Toshihiro Yasuda

Kazuo Sudo

Haruhiko Hata

Yasushi Kanazawa

Satoshi Okada

Masahiro Takeuchi

Masaki Yoda

Masataka Tamura

Hiroyuki Miyasaka

Hiromi Kato

Wataru Kono

Yoshio Hamamoto

Yuuichi Motora

Taiji Kobayashi

An apparatus for reinforcing a jet pump riser includes: an elbow upper clamp for covering a riser elbow coupled to a thermal sleeve from an upper side thereof; an elbow lower clamping member for clamping the riser elbow from a lower side thereof; an elbow vertical portion clamping member for covering a vertical portion of the riser elbow; and an elbow horizontal portion clamping member for covering a horizontal portion of the riser elbow. These members are disposed in different orientations with respect to the elbow upper clamp so as to fix the thermal sleeve, the riser elbow and the riser pipe.

Apparatus and method for reinforcing jet pump riser

A heating laser beam is emitted to a cracked portion to remove moisture from the cracked portion, and subsequently, a welding laser beam is emitted to the cracked portion to heat and melt the cracked portion. The heating laser beam and the welding laser beam are emitted to an entire surface of the cylindrical body inside the reactor such as a stub tube penetrating through and fixed to a reactor bottom portion and a crack of the welded portion between the cylindrical body and the reactor bottom portion to thereby prevent a new crack from occurring and reactor water from leaking.

Reactor bottom repairing method

Growing community of inventors

Yokohama, Japan

Masakazu Abura