Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Shield or barrier between radiation or heat source and...
Patent
1993-12-03
1995-07-25
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
Shield or barrier between radiation or heat source and...
376302, G21C 1100
Patent
active
054369452
ABSTRACT:
Disclosed is a method for reducing embrittlement of certain materials of pressurized water reactor vessels caused by neutron flux. According to this method, "shadow shielding" is placed within the core support barrel in areas having a more benign flow environment than that of the downcomer area. This shadow shielding provides an increased neutron scattering cross section. In one example, the shadow shielding replaces segments of the core shroud plate in a manner which does not interfere with coolant flow in the vessel. The segments of the shroud plate which are replaced are those near critical regions of the vessel, typically welds. The size and shape of the shielding is determined according to plant specific requirements.
REFERENCES:
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patent: 4731220 (1988-03-01), Kim, Jr.
patent: 4743423 (1988-05-01), Turner et al.
patent: 4759896 (1988-07-01), Boyd
patent: 5116569 (1992-05-01), Kasahara et al.
Mullooly John F.
Weisel Eric M.
Combustion Engineering Inc.
Kananen Ronald P.
Mullholland John H.
Wasil Daniel D.
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