Reactor core shroud repair using thermally tensioned ring to app

Details Reactor core shroud repair using thermally tensioned ring to app Reactor core shroud repair using thermally tensioned ring to app

1997-02-21

1998-04-07

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Reactor protection or damage prevention

Core restraint means

376287, G21C 1100

Patent

active

057373795

ABSTRACT:
An apparatus for repairing the core shroud of a nuclear reactor having one or more cracked vertical seam welds. The repair involves installation of a ring around the circumference of the shroud while the reactor is shutdown. The ring is tensioned with a mechanical preload and then vertically supported with shear bolts or struts. The ring is made of an alloy having a coefficient of thermal expansion less than the coefficient of thermal expansion of the shroud material. When the reactor returns to operation, the consequent temperature rise causes the shroud to expand more than the ring expands. As a result the ring exerts a circumferential compressive load across any cracks in the vertical seam welds intersected by the ring.

REFERENCES:
patent: 4409179 (1983-10-01), Burger
patent: 5623526 (1997-04-01), Wivagg

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