Method for sealing a stub tube in a nuclear reactor

Details Method for sealing a stub tube in a nuclear reactor Method for sealing a stub tube in a nuclear reactor

1997-03-10

1998-09-15

Jordan, Charles T.

Induced nuclear reactions: processes, systems, and elements

Seal arrangements

376260, 376286, 228184, 277314, 277606, G21C 1328

Patent

active

058090983

ABSTRACT:
Methods for sealing cracks adjacent stub tube attachment welds in a reactor pressure vessel of a nuclear reactor are described. The reactor pressure vessel includes at least one stub tube through which a control rod housing extends. The control rod housing is attached to one end of the stub tube with an upper stub tube attachment weld. In one embodiment, a sidewall of a control rod drive housing is cut at a location below the upper stub tube attachment weld to form a weld passage in the control rod drive housing between the control rod drive housing and the stub tube. A weld is then formed in the weld passage so that it is in physical contact with both the stub tube and the control rod housing, and thus seals the control rod drive housing against the stub tube.

REFERENCES:
patent: 4480841 (1984-11-01), Schukei et al.
patent: 5006300 (1991-04-01), Jonsson et al.
patent: 5209894 (1993-05-01), Borrman et al.
patent: 5267279 (1993-11-01), Saito et al.

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