Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Core restraint means
Patent
1995-08-18
1996-11-19
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
Core restraint means
G21C 1500
Patent
active
055770827
ABSTRACT:
A method of repairing nuclear reactor core shrouds having horizontal cracks in heat affected zones of welds includes applying vertical compressive forces to the shroud in situ to urge opposed surfaces of the cracks toward one another. A plurality of tie rods, angularly spaced about the shroud periphery, is used to selectively apply the longitudinally compressive forces. Preferably, the method utilizes existing hardware secured to the shroud for attaching the tie rods thereto. The tie rods may be used in communication with horizontal and/or vertical spacers inserted between the shroud and the reactor vessel. Horizontal spacers serve to resist horizontal seismic loads and hold the shroud in place in spite of cracking. Vertical spacers resist vertically upward loads resulting from main steam line breaks.
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Cole Noman
Weems Sterling J.
MPR Associates, Inc.
Wasil Daniel D.
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