Method and apparatus for repair of nuclear reactor shroud

Details Method and apparatus for repair of nuclear reactor shroud Method and apparatus for repair of nuclear reactor shroud

1996-04-17

1998-08-11

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

376285, 376302, 2940214, G21C 1900

Patent

active

057938288

ABSTRACT:
In order to support a shroud against bending, shear, stress and torsion, straps are placed in strategic positions with respect to cracks or like types of weaknesses which have been detected, and fastened in place using a suitable fastening technique. Holes are formed using an EDM technique in cooperation with supports for an EDM placed on the straps, and bolt units which have an expanding portion are inserted into the holes, torqued and expanded in a manner which fastens the strap to the shroud. A temperature responsive bimetallic strain system which produces a clamping force, is created by forming the straps of a material which has a lower expansion coefficient than the shroud material. As the reactor heats, the expansion differential tensions the straps and produces a clamping force.

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patent: 5623526 (1997-04-01), Wivagg
patent: 5654992 (1997-08-01), Uraki et al.

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