Kabushiki Kaisha Toshiba

Yasumi Kitajima

Makoto Kondo

Makoto Ochiai

Katsuhiko Sato

Michio Sato

Masaki Yoda

Tsuyoshi Hagiwara

Mitsuaki Shimamura

Naruhiko Mukai

Yoshifumi Sato

Motohiko Kimura

Yuji Sano

Masanobu Watanabe

Yutaka Togasawa

Hiroaki Igakura

Masahiko Warashina

The present invention provides a vibration monitoring apparatus that monitors vibration of a jet pump disposed in a reactor pressure vessel using ultrasonic wave, including: an ultrasonic sensor that is attached to an outside the reactor pressure vessel, and transmits and receives ultrasonic wave; a reflector that is mounted on a surface of a riser pipe of the jet pump, and includes a planar reflecting surface that can reflect ultrasonic wave; and a signal processing unit that performs signal processing of the ultrasonic wave transmitted by the ultrasonic sensor, reflected by the reflecting surface of the reflector, and received by the ultrasonic sensor, and measures a vibration amplitude of the riser pipe and calculates a vibration waveform.

Vibration monitoring apparatus and vibration monitoring method

A laser emitting head for irradiating a portion to be machined with laser beams outputted from a laser unit () incorporates an emitting head body having a light guide member () in the head for guiding the laser beams; a light converging lens () for converging the laser beams transmitted from the light guide member in the head; a reflecting mirror () for irradiating the portion to be machined with the converged laser beams; mirror rotating means () for holding the reflecting mirror to be rotative around the optical axis of the laser beam; distance-adjustment means () for adjusting the relative distance between the reflecting mirror and the converging lens; and moving means () for moving the reflecting mirror and the converging lens such that the relative distance is maintained so that the light guide member in the head. The converging lens and the reflecting mirror can be introduced/discharged with respect to a portion to be machined and formed in a narrow gap in an incore structure. As a result, a preventive-maintenance/repair operation using laser beams and arranged to be performed in a narrow gap in the incore structure can safely and efficiently be performed.

Laser emission head, laser beam transmission device, laser beam transmission device adjustment method and preventive maintenance/repair device of structure in nuclear reactor

Growing community of inventors

Tokyo, Japan

Yasumi Kitajima