Corrugated thimble tube for controlling control rod descent...

Details Corrugated thimble tube for controlling control rod descent... Corrugated thimble tube for controlling control rod descent...

G - Physics

21

C

359/36

G21C 7/14 (2006.01) G21C 7/20 (2006.01)

Patent

CA 1106084

CORRUGATED THIMBLE TUBE FOR CONTROLLING CONTROL ROD DESCENT IN NUCLEAR REACTOR ABSTRACT Improved shock absorber for slowing down the descent of a control rod in a liquid cooled reactor core at a controlled rate uses a thimble tube which has a corru- gated section at its lower end to distribute the control rod deceleration forces over an extended distance in an emergency situation. In a preferred embodiment, the corru- gations have a lesser internal diameter at the lower end of the thimble tube than at the top to increase the rate of deceleration as the control rod approaches the bottom of the core. In several modifications, the corrugation pitch and/or depth is varied over the length of the corru- gated surface.

316044

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