Method for replacing a through-tube of the vessel bottom head of

Details Method for replacing a through-tube of the vessel bottom head of Method for replacing a through-tube of the vessel bottom head of

1995-07-03

1997-08-26

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

376254, 376250, 2940208, G21C 13036

Patent

active

056617674

ABSTRACT:
The tube to be replaced is extracted and an internal surface of the bottom head (1b) is then machined around the through opening (10), a hollow shell (20) is attached and fixed on the machined surface (15) of the bottom head (1b), around the through opening (10), by welding along a peripheral edge (19), the hollow shell is bored in order to produce a passage hole (24) through its wall, in extension of the through opening (10) and a welding bevel (23). A replacement through-tube (18) is fixed on the wall of the hollow shell (20) by depositing a welding metal (25) in the bevel (23). The invention applies in particular to the replacement of vessel bottom head penetrations of a pressurized water nuclear reactor.

REFERENCES:
patent: 5267279 (1993-11-01), Saito et al.
patent: 5272734 (1993-12-01), Clark et al.
patent: 5367768 (1994-11-01), Weems
patent: 5404382 (1995-04-01), Russ et al.
Abstracts of Japan, JP-A-2 098 696 Hitachi, Apr. 1990.

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