Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor... – Vessel monitoring or inspection
Patent
1993-09-01
1995-02-07
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Testing, sensing, measuring, or detecting a fission reactor...
Vessel monitoring or inspection
376159, G21C 1700
Patent
active
053881290
ABSTRACT:
Apparatus and method for radiographic inspection of welds, which welds may be seal welds of the kind typically found on nuclear power reactor control rod drive mechanisms (CRDMs). Such CRDM seal welds seal the threaded joint defined by a generally tubular pressure housing and a generally tubular vessel head adapter, the housing and adapter enclosing the CRDM components. The apparatus comprises a circular track capable of surrounding and being connected to the vessel head adapter. A radiation source assembly capable of emitting penetrating radiation and a radiation shielding assembly capable of shielding against the radiation are mounted on the track. The assemblies are adjustable for aligning the assemblies with the seal weld. A radiographic film is interposed between the radiation source assembly and the radiation shielding assembly and adjacent the weld for capturing a volumetric image of the weld on the film. A collimated beam of penetrating radiation is emitted from the radiation source assembly along an axis passing tangentially through the seal weld and through the film for suitably radiographing relatively small pinhole-sized anomalies in the weld.
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Chelliah Meena
Stevens Walter S.
Walsh Donald P.
Westinghouse Electric Corporation
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