Nuclear fuel assemblies

Details Nuclear fuel assemblies Nuclear fuel assemblies

1990-01-12

1992-04-21

Walsh, Donald P.

Induced nuclear reactions: processes, systems, and elements

Fuel component structure

Plural fuel segments or elements

376443, 376444, G21C 334

Patent

active

051065754

ABSTRACT:
A nuclear fuel assembly has a plurality of fuel rods and a lower tie plate supporting their lower ends. Coolant apertures extending through the lower tie plate. A channel box surrounds the fuel rods and receives the lower tie plate, to confine the coolant. To restrict leakage of coolant between the tie plate and the channel box, the coolant apertures include, adjacent the periphery of the lower tie plate, a plurality of peripheral apertures which are located at least partly outside the outermost fuel rods. The peripheral apertures each provide a coolant velocity peak located further from the axial center line of the tie plate than the axial center lines of the closest neighboring fuel rods. The invention also provides venturis in the leakage path between the channel box and the tie plate, to restrict deformation of the tie plate.

REFERENCES:
patent: 4035233 (1977-07-01), Williamson
patent: 4560532 (1985-12-01), Barry
patent: 4655995 (1987-04-01), Freeman
patent: 4889684 (1989-12-01), Johansson

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