Method of exchanging a nozzle passing through a cover of a nucle

Details Method of exchanging a nozzle passing through a cover of a nucle Method of exchanging a nozzle passing through a cover of a nucle

1993-10-25

1995-04-04

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

2940208, 29446, G21C 1300

Patent

active

054043824

ABSTRACT:
After some time incipient cracks may occur in nozzles welded directly into a reactor pressure vessel cover for guiding a control rod, which make it necessary to exchange the nozzles. A method is provided for exchanging the nozzles which changes the structure of the cover little during removal and accomplishes low-stress installation. According to the method, the nozzles are installed with prestressing. An annular surface is introduced from the inside of the cover coaxially to the through-bore and a supporting surface is introduced from the outside of the cover, which surfaces serve for applying the prestressing force and arresting the same.

REFERENCES:
patent: 3240514 (1966-03-01), Bell
patent: 3834740 (1974-09-01), Bazant et al.
patent: 3907636 (1975-09-01), Swart
patent: 4782727 (1988-11-01), Martin et al.
patent: 5094801 (1992-03-01), Dixon et al.
patent: 5278878 (1994-01-01), Porowski
"Atomwirtschaft" (Atomic Industry), May 1975 pp. 254-255.

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