Lower tie plate debris catcher for a nuclear reactor

Details Lower tie plate debris catcher for a nuclear reactor Lower tie plate debris catcher for a nuclear reactor

1994-07-13

1995-05-30

Harvey, Behrend E.

Induced nuclear reactions: processes, systems, and elements

Reactor structures

Orifice or fluid control at inlet or outlet of coolant channels

376313, 376440, 376439, G21C 330, G21C 1502, G21C 1900

Patent

active

054209013

ABSTRACT:
A unitary one-piece lower tie plate grid has a lower portion and an upper portion for supporting the fuel rods. The lower tie plate grid includes cylindrical boss portions arranged in square matrices for receiving the lower end plugs of the fuel rods. Web portions interconnect the boss portions along the sides of the matrices. The lower grid portion includes a plurality of openings which open into the flow spaces defined by the convex portions of the bosses and the webs within each square matrix of the upper portion of the tie plate. Coolant flows through the lower flow openings into the flow spaces for further flow upwardly about the fuel rods. The openings are defined by the convex lower portions of the bosses and webs, as well as projections which extend laterally inwardly from the convex surfaces of the lower boss portions toward a central region in the middle of the square matrix. The projections are cylindrical and terminate short of one another to define a generally cloverleaf-shaped flow opening having multi-lobes which, in conjunction with the projections, catch debris while maintaining coolant flow into the flow spaces above the projections at minimum pressure drop.

REFERENCES:
patent: 4039379 (1977-08-01), Patterson et al.
patent: 4655995 (1987-04-01), Freeman et al.
patent: 4781884 (1988-11-01), Anthony
patent: 5106575 (1992-01-01), Nakamura et al.
patent: 5282231 (1994-01-01), Adams et al.

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