Anti-ejection system for control rod drives

Details Anti-ejection system for control rod drives Anti-ejection system for control rod drives

1975-02-18

1977-08-30

Gerin, Leonard H.

Machine element or mechanism

Gearing

Directly cooperating gears

744248C, F16H 118

Patent

active

040446220

ABSTRACT:
A linearly movable latch mechanism is provided to move into engagement with a deformable collet whenever an undesired ejection of a leadscrew is initiated from a nuclear reactor mounted control rod drive. Such an undesired ejection would occur in the event of a rupture in a housing of the control rod drive. The collet is deformed by the linear movement of the latch mechanism to wedge itself against the leadscrew and prevent the ejection of the leadscrew from the housing. The latch mechanism is made to be controllably engageable with the leadscrew and when thus engaged to allow the leadscrew to move in a control direction while moving with the leadscrew to engage and deform the collet when the leadscrew moves in an ejection direction.

REFERENCES:
patent: 3053104 (1962-09-01), Scavini
patent: 3079323 (1963-02-01), Hawke
patent: 3583254 (1971-06-01), Winders
patent: 3822439 (1974-07-01), Wallin et al.
patent: 3861221 (1975-01-01), Stanley

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