Nuclear fuel assembly having a transition piece providing a redu

Details Nuclear fuel assembly having a transition piece providing a redu Nuclear fuel assembly having a transition piece providing a redu

1998-08-03

1999-08-24

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Reactor structures

Orifice or fluid control at inlet or outlet of coolant channels

376443, 376451, G21C 3322, G21C 506

Patent

active

059433850

ABSTRACT:
In order to reduce the flow resistance of a coolant flowing through a passage in a support plate of a boiling water reactor and entering a transition piece at a lower end of a fuel assembly resting on the support plate, a lower rim of the transition piece forms a conically tapered surface which fits into a corresponding conical counter-surface at an upper edge of the passage. The lower rim of the transition piece forms a circular inlet which is concentric with the passage and has a size equal to or slightly larger than the passage. Fingers protruding laterally into the passage and extending down into the passage are used to center the lower rim within the passage. Additionally, end caps of the fuel rods may be stream-lined and the lower tie plate of the fuel assembly may be spaced apart from an inner surface of a fuel channel by a plurality of ribs which form a plurality of peripheral through holes on each of the four inner surfaces of the rectangular-shaped fuel channel.

REFERENCES:
patent: 3389056 (1968-06-01), Frisch
patent: 4826653 (1989-05-01), Nylund et al.
patent: 5483565 (1996-01-01), Gronlund et al.
patent: 5727040 (1998-03-01), Lippert et al.

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