Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Shield or barrier between radiation or heat source and...
Patent
1988-09-27
1989-12-19
Wasil, Daniel
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
Shield or barrier between radiation or heat source and...
376254, 376292, 376352, G21C 1100, G21C 1700
Patent
active
048881490
ABSTRACT:
A wear-reduction-shield (40) for use between the core plate (24) and lower end fitting (26) of a pressurized water reactor (10) to reduce excessive wear of in-core-instrumentation thimbles (30) due to flow induced vibrations and resist fuel assembly tipping has a cylindrical body portion 42with core plate engaging lower end surface (44). At the opposite and upper end, a tapered internal end wall (46) assists upward threading of the monitor and cable. On the outside of the upper end symmetrical leg portions (52) and central land (54) surround a thimble (30) receiving opening (48). Smoothly tapering outer surface (56) minimizes turbulence in and beyond opening (34) in lower end fitting (26). Internal dimensions of shield (40) avoid structure such as sleeve (50) which may be present.
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: 4765944 (1988-08-01), Heuze et al.
patent: 4778647 (1988-10-01), Gasparro
Combustion Engineering Inc.
Mulholland John H.
Wasil Daniel
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