Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Core restraint means
Patent
1994-12-15
1997-02-04
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
Core restraint means
376285, 376292, G21C 1100, G21C 510
Patent
active
056006896
ABSTRACT:
A method and apparatus for repairing nuclear reactor core shrouds includes applying vertical compressive forces to the shroud in situ to urge opposed ends of the shroud toward one another using a plurality of tie-rods, each including a plurality of coaxial longitudinal members separated by a radial gap filled with reactor coolant or some other damping fluid. One of the longitudinal members is secured to upper and lower portions of the shroud for maintaining a sufficient preload to hold the shroud together and is coupled with one or more other longitudinal members in a manner to transmit axial loads thereto upon extending a predetermined axial distance. A plurality of radial spacers can also be positioned at longitudinally spaced locations along the length of the tie-rod to assure control rod insertion by limiting lateral movement of the shroud and can reduce the preload required for preventing the formation of new cracks and stabilizing existing cracks.
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Cole Noman
McCurdy H. William
Weems Sterling J.
MPR Associates, Inc.
Wasil Daniel D.
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