Process for repairing and protecting from cracking the inner wal

Details Process for repairing and protecting from cracking the inner wal Process for repairing and protecting from cracking the inner wal

1994-04-29

1996-08-06

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

376254, 205115, 205131, G21C 1900

Patent

active

055442099

ABSTRACT:
During shutdown of the nuclear reactor, the closure head of the vessel having been dismounted and the vessel (3) and the pool of the reactor both being filled with water, an inner zone of the penetration tube (6) for penetrating the bottom head of the vessel (3) is isolated between two seals (39,42), from the upper level of the pool. An electrolyte is caused to flow in the isolated zone inside the penetration tube (6) and a current is passed through the electrolyte in order to deposit a metallic electroplating layer onto the inner surface of the penetration tube (6) in the isolated zone. The metallic layer is preferably a layer of nickel of a thickness of approximately 0.1 mm.

REFERENCES:
patent: 4624750 (1986-11-01), Malagola et al.
patent: 4696723 (1987-09-01), Bosquet et al.
patent: 4826582 (1989-05-01), Lavalerie et al.
patent: 5227124 (1993-07-01), Saito et al.
Patent Abstracts of Japan, vol. 4, No. 77, JP-A-55 041 963, Abstract, Mar. 25, 1980.

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