Induced nuclear reactions: processes – systems – and elements – Reactor structures – Orifice or fluid control at inlet or outlet of coolant channels
Patent
1988-07-29
1990-12-04
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Reactor structures
Orifice or fluid control at inlet or outlet of coolant channels
376254, 376292, G21C 1700
Patent
active
049752413
ABSTRACT:
A wear-reduction-sleeve for in-core-instrumentation thimbles of a pressurized water nuclear reactor having bottom mounted instrumentation to curtail flow induced excitation and increase support contact area in the region of thimble length which extends through and defines an annulus with the core support plate and extends upwardly to and through the fuel assembly flow distribution plates. The wear-reduction-sleeve includes a hollow shank portion which gives a low wear coefficient when in contact with the chrome-plated thimble and is inserted into the annulus and below where it is radially expanded and secured to a thimble guide tube. An upper portion of the wear-reduction-sleeve between the core support plate and flow distribution plate has a flow collection chamber and radial flow exit slots which divert thimble flow substantially away from the hole in the fuel assembly flow distribution plate through which the thimble extends.
REFERENCES:
patent: 4716004 (1987-12-01), Merkovsky et al.
patent: 4717529 (1988-01-01), Merkovsky et al.
patent: 4751039 (1988-06-01), Delevallee et al.
patent: 4778647 (1988-10-01), Gasparro
patent: 4822558 (1989-04-01), Merkovsky et al.
"Flow Induced Vibrations", Bowness-on-Windermere, England, May 1987, Gorman et al.
Haslinger Karl H.
Higgins Woodruff H.
Martin Michael L.
Porter Douglas S.
Combustion Engineering Inc.
Mulholland John H.
Wasil Daniel D.
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