Mitsubishi Heavy Industries Limited

The Kansai Electric Power Co., Inc.

The Tokyo Electric Power Company, Incorporated

Chubu Electric Power Company, Inc.

The Chugoku Electric Power Co., Inc.

Tohoku Electric Power Company, Inc.

Electric Power Development Co., Ltd.

Kyushu Electric Power Co., Inc.

Hokkaido Electric Power Company, Inc.

Shikoku Electric Power Co., Inc.

Hokuriku Electric Power Company

The Japan Atomic Power Company

Koji Okimura

Takashi Ishide

Yukio Michishita

Yoshio Hashimoto

Tomochika Hamamoto

Kazuyuki Hinami

Yasumi Nagura

Takao Konno

Michisuke Nayama

Akio Minamiyama

Yutaka Nishitsuji

Masao Watanabe

Takashi Akaba

Ryuichi Narita

Nobuyuki Hori

Takahiro Ota

Tadashi Nagashima

Kazuhiko Kamo

Hironori Onitsuka

Seiji Asada

Itaru Muroya

Katsusuke Shimizu

Kazuhiro Wakabayashi

Moritatsu Nishimura

Harutaka Suzuki

In an installation device of a reactor repair device and a method, an installation pole () connected with an upper portion of a water jet peening device (), a lifting device () that can suspend and support an upper portion of the installation pole () and can lift the installation pole () from a work floor (), a moving device () that can move the lifting device () in two directions intersecting in a horizontal direction, and a position adjustment device () that can move the installation pole () in the horizontal direction in a state where the installation pole () is supported by the lifting device ().

Installation device of reactor repair device and method

Provided is a water jet peening apparatus and a water jet peening method including: a clamping cylinder () which is able to be disposed at the outer peripheral side of an instrumentation nozzle () with a predetermined gap therebetween; a clamping piece () which is able to fix the clamping cylinder () to the instrumentation nozzle (); a nozzle guide () which has a cylindrical shape, is provided inside the clamping cylinder (), and is positioned to a position adjacent to the upper end of the instrumentation nozzle (); an inner surface WJP nozzle () which is movable upward and downward inside the nozzle guide (); and a drainage hole () which radially penetrates the nozzle guide (). Accordingly, it is possible to improve the safety of the operation by preventing a thimble tube from being popped out due to a water jet peening operation.

Water jet peening apparatus and water jet peening method

[Problem] To facilitate mounting of a nozzle. [Solving Means] In a nozzle mounting structure for mounting a nozzlepenetrating through a reactor vesselhaving a hemispherical concave inner surface, the nozzle mounting structure includes a removed concave portionin which a base materialon an inner surface side of the reactor vesselis removed in a symmetrical shape around a normal line N on the hemispherical concave inner surface of the reactor vessel, a flangeprovided on the nozzle, formed in a same symmetrical shape as that of the removed concave portionaround the normal line N, and inserted into the removed concave portion, and a weld partprovided around the normal line N for welding the flangeto the reactor vessel

Nozzle mounting structure

An object is to provide a method and an apparatus for improving a residual stress in a tubular body, which are enabled to improve the residual stress reliably by clearly defining controlling rage for treatment conditions without depending on an installation state and configuration of the tubular body. When a cylindrical tubular body () is improved in its residual stress by locally irradiating an outer-circumferential surface of a welded portion (C) of the tubular body () with laser beams () and by moving an irradiation area (s) in an circumferential direction, a plurality thermocouples () are installed on the tubular body () to be improved, a temperature history of the outer surface of the tubular body () by the irradiation of the laser beam () is managed by measuring the temperature history itself.

Method for improving residual stress in tubular body

A laser beam machining head includes a dividing optical system for dividing laser light into two separate laser beams, and providing spacing therebetween; a condensing optical system for condensing the separate laser beams into condensed laser light, and projecting it onto a cutting site of an object to be cut; and an inner assist gas nozzle placed between the separate laser beams, a width of an opening of a tip portion of the inner assist gas nozzle being nearly equal to a cutting width. Or the tip opening of the inner assist gas nozzle is slender; or its tip side is inclined, and the angle of inclination is variable; or the relative positions of the inner assist gas nozzle and a workpiece, or the relative positions of the focal position of the condensing optical system and the workpiece are variable independently; or an outer assist gas nozzle surrounding the separate laser beams is provided.

Laser beam machining head

In a laser beam machine head, when a filler wire and an optical axis of a laser beam are arranged coaxially, a convex roof mirror and a concave roof mirror are combined to divide the laser beam into two separate laser beams to that no laser beam is projected onto a filler wire feed pipe. Furthermore, the filler wire is fed from outside the laser beams to a condensing position via a filler wire guide in the spacing between the separate laser beams, or an electrode supported by a water flow pipe or an electrode holding pipe is brought close to the condensing position.

Growing community of inventors

Tokyo, Japan

Koji Okimura