Positive lock holddown device

Details Positive lock holddown device Positive lock holddown device

1978-11-24

1981-05-19

Nelson, Peter A.

176 76, 176 81, G21C 330

Patent

active

042683572

ABSTRACT:
An apparatus for providing a high, positive locking force at the bottom of a nuclear fuel assembly to resist upward coolant flow forces. A latch on the fuel assembly alignment post is cammed to engage the fuel alignment pin in the core support stand and is linked to an actuating rod extending through the lower end of the fuel assembly center guide tube. The upward flow of coolant against the link and actuating rod causes the link to approach the horizontal, thereby exerting a high locking force between the latch and the fuel alignment pin. In the preferred embodiment spring means interact between the lower end fitting and the actuating rod to maintain an upward bias on the rod.

REFERENCES:
patent: 3057793 (1962-10-01), Coates et al.
patent: 3389056 (1968-06-01), Frisch
patent: 3549491 (1970-12-01), Johnson
patent: 4038133 (1977-07-01), Bittermann et al.
patent: 4134790 (1979-01-01), Bevilacqua et al.

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