Guide post modification for nuclear fuel assembly

Induced nuclear reactions: processes – systems – and elements – Reactor structures – With particular control rod guide structure

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376443, G21C 332, G21C 1500

Patent

active

043137962

ABSTRACT:
An improved guide tube post which decreases the flow induced vibration of a cylindrical control rod suspended therethrough. The inner wall of the post, near where it exits into a diffuser region, is provided with a polygonal cross section. When, due to random fluctuation, the rod assumes an eccentric position near the wall of the post, the polygonal post geometry provides a relatively large angle between the post wall and the surface of the rod near the wall. It has been found that if this angle is too small, strong secondary flows develop along the length of the control rod and interact with other vortices in the diffuser region, to produce the vibration driving force. The polygonal cross section in the post modifies the secondary flow to reduce the intensity of the interaction with the diffuser vortices.

REFERENCES:
patent: 2735811 (1956-02-01), Weinberg et al.
patent: 3178356 (1965-04-01), Wheelock
patent: 3249510 (1966-05-01), Dohm, Jr. et al.
patent: 3481832 (1969-12-01), Rickert
patent: 3814667 (1974-06-01), Klumb et al.
patent: 4030975 (1977-06-01), Anthony et al.

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