Induced nuclear reactions: processes – systems – and elements – Handling of fission reactor component structure within... – Fuel component
Patent
1992-06-23
1993-07-06
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Handling of fission reactor component structure within...
Fuel component
376287, G21C 1900, G21C 1100
Patent
active
052251500
ABSTRACT:
A nuclear reactor such as a pressurized water reactor has an integrated head package providing structural support and increasing shielding leading toward the vessel head. A reactor vessel head engages the reactor vessel, and a control rod guide mechanism over the vessel head raises and lowers control rods in certain of the thimble tubes, traversing penetrations in the reactor vessel head, and being coupled to the control rods. An instrumentation tube structure includes instrumentation tubes with sensors movable into certain thimble tubes disposed in the fuel assemblies. Couplings for the sensors also traverse penetrations in the reactor vessel head. A shroud is attached over the reactor vessel head and encloses the control rod guide mechanism and at least a portion of the instrumentation tubes when retracted. The shroud forms a structural element of sufficient strength to support the vessel head, the control rod guide mechanism and the instrumentation tube structure, and includes radiation shielding material for limiting passage of radiation from retracted instrumentation tubes. The shroud is thicker at the bottom adjacent the vessel head, where the more irradiated lower ends of retracted sensors reside. The vessel head, shroud and contents thus can be removed from the reactor as a unit and rested safely and securely on a support.
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Hornak Leonard P.
Malandra Louis J.
Meuschke Robert E.
Valentine J. C.
Wasil Daniel D.
Westinghouse Electric Corp.
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