Other

Hitachi, Ltd.

Hitachi Engineering Co., Ltd.

Akira Koizumi

Norio Kawashima

Yoshiharu Kikuchi

Yasuyuki Gotoh

Kouichi Machida

Yoshiaki Ichikawa

Kenji Tsuchita

Yasuhiro Aizawa

Makoto Senoh

Yoshitaka Nishino

Kunihiko Iwama

Takayoshi Yasuda

A control rod for a BWR according to the present invention comprises a first unit composed of a tie rod, a handle mounted on an axially upper portion of the tie rod and a lower support member or falling speed limiter mounted on a axially lower portion of the tie rod; and a second unit composed of a sheath containing therein reactivity control material, an upper end plate mounted on an axially upper portion of the sheath and a lower end plate mounted on an axially lower portion of the sheath, wherein an upper portion of the upper end plate is fixed to the handle, a lower portion of the lower end plate is fixed to the lower support member or falling speed limiter, whereby the control rod is constructed as a joined body of the first unit and the second unit.

Control rod for boiling water reactor, unit for control rod and production method of control rod

To reduce the manufacturing processes of a control rod and shorten the time required for manufacturing a control rod, for the lower part support member,, the thin parts,A and,B are formed in the neighborhood of each of the left and right sides of the window,. In the left and right sides of the pull-up handle,, the grooves,A and,B are formed respectively. The groove,B is deeper than the groove,A. The thin part,A is fitted into the groove,A and the thin part,B is fitted into the groove,B. The gap formed between the end of the thin part,B and the bottom of the groove,B is larger than the gap formed between the end of the thin part,A and the bottom of the groove,A. Therefore, the thin part,A can be simply fitted into the groove,A.

Control rod and manufacturing method for the control rod

The present invention relates to a control rod installed in a boiling water reactor (BWR), and particularly to a control rod using metal. An object of the present invention is to provide a manufacturing method of a control rod for a boiling water reactor, having excellent corrosion resistance in high temperature water and excellent wear resistance at the time of fabrication, and in which the influence of the manufacturing process is slight. In order to achieve the above described object, the present invention provides a manufacturing method of a control rod for a boiling water reactor constructed with sheaths having a U-shaped cross section attached to each end of a tie rod having a cruciform cross section, and rod, plate or oval tube cross section metal hafnium type neutron absorber material contained inside the sheaths, in which an anodized film is provided on a surface of the neutron absorber material as a pre-process of assembly of the neutron absorber material in the structure of the control rod.

Manufacturing method of control rod for boiling water reactor

A method and an apparatus for controlling a reactor refuelling machine including a plurality of grippers comprised of a plurality of telescopic bars which are telescopically actuatable independently of each other and at least one gripping member mounted to each telescopic bar. A decision is made as to whether the movement of a particular gripper in the Z direction is constrained by a status of the movement of a different gripper. The parallel operation is performed when the movement of the particular gripper in the Z direction is not constrained and when constrained, the particular gripper is placed in condition for waiting.

Method and apparatus for controlling refuelling machine of reactor

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Hitachi, Japan

Akira Koizumi