Hitachi, Ltd.

Toshitaka Satsuta

Toshimi Matsumoto

Akira Onuma

Keiichi Uraki

Tsutomu Onuma

Mitsuo Nakamura

Takahiko Kato

Hisanori Okamura

Kunihiko Suzuki

Ren Morinaka

Eisaku Hayashi

Yasumasa Tamai

Hiroshi Yamauchi

Jun'ya Kaneda

An underwater laser processing system has a laser torch; a laser torch driving mechanism for changing a laser emission position of the laser torch; and a chamber with one end opened to an external environment, which contains the laser torch; wherein a partitioning wall for preventing permeation of water is provided between a free end of the chamber and the laser torch. The system is used for detecting a sensitized portion and repairing it at one time using a sensitization detecting arrangement. Moreover, it is used for forming an alloying layer by melting a sprayed coating film, and for forming a new surface layer by emitting a laser beam through a solution containing a metal component.

Underwater laser processing device including chamber with partitioning

A neutron-irradiated structural material having a defect in a nuclear reactor internals is repaired by covering the structural material to be repaired with a plate to cover over a portion thereof having the defect, and then welding the plate and the structural material by locally applying pressure on the surface of the plate and adding energy to the portion to which the pressure is applied thereby to generate thermal energy in the contact surfaces between the plate and the structural material.

Method of repairing structural materials of nuclear reactor internals

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Atsugi, Japan

Toshitaka Satsuta