Control blade servicing assembly

Details Control blade servicing assembly Control blade servicing assembly

1992-10-19

1993-09-21

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

83917, 30277, 30286, G21C 1900

Patent

active

052475450

ABSTRACT:
An assembly for servicing a cruciform control blade includes a carriage having first and second crossarms each containing a generally U-shaped slot for receiving the top of the control blade. The first crossarm includes a clamping actuator to rigidly clamp the carriage to the blade top. The second crossarm includes a tool positionable adjacent to a roller aperture in a selected one of the four panels of the control blade. The tool is positioned on the second crossarm at a predetermined depth, and at a predetermined lateral span from the first crossarm so that upon mounting of the carriage on the blade top and actuation of the clamping actuator, the tool is vertically and laterally aligned with a center of the panel roller aperture. In one embodiment, the tool is effective to sever the roller from the panel aperture without damaging the panel, and in another embodiment the tool is effective for installing a replacement spacer pad in the aperture.

REFERENCES:
patent: 4006527 (1977-02-01), Sivachenko
patent: 4257292 (1981-03-01), Faull
patent: 4434092 (1984-02-01), Mary
patent: 4643845 (1987-02-01), Omote et al.
patent: 4747995 (1988-05-01), Bednarik et al.
patent: 4788027 (1988-11-01), Krieg
Baversten et al., "Replacement of Pins & Rollers on Irradiated Control Rods," ABB Atom Inc., Feb. 1991, pp. cover, 1-6, and FIGS. 1-6.
Asea Atom, "BWR Control Rod Manufacturing," 1987, 4-pages from an apparent brochure.
Morlin et al., "The Ultimate BWR Control Rod," Asea Journal 1-87, pp. cover and 20-22.
ASEA-Atom, "Long Life Control Rods," 1983, 12-pages.
Morlin et al., "Performance Experience of ASEA-Atom BWR Control Blades," ANS Topical Conference, Apr. 21-24, 1985, pp. 5-29 to 5-42.
General Electric Company, excerpt from a proprietary Sep. 19, 1980 drawing 913E398 showing a "Roller Removal Tool" built and used in 1970's at commercial nuclear plants to remove rollers from control rods.

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