Induced nuclear reactions: processes – systems – and elements – Seal arrangements
Patent
1991-10-03
1993-05-11
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Seal arrangements
376286, G21C 1328
Patent
active
052098940
ABSTRACT:
A method for sealing a leak between a control rod drive (CRD) stub tube (3) arranged in a reactor wall (2) and a tubular CRD housing (1) extending through the CRD stub tube (3) and the vessel wall (2). According to the invention, this sealing is obtained by deforming a suitably shaped element of memory metal below the transition temperature of the memory metal in such a way that it can be inserted, in the form of a sleeve (5) or a ring, into or around the CRD housing (1) where said housing passes through the vessel wall (2), or alternatively replace part of the CRD housing (1) at the passage through the vessel wall (2). Then when the memory metal is heated to above the transition temperature, it strives to resume its original shape which shall then have been such that the desired seal is obtained.
REFERENCES:
patent: 4469357 (1984-09-01), Martin
patent: 4872713 (1989-10-01), Kapgan
patent: 5006300 (1991-04-01), Jonsson et al.
patent: 5120488 (1992-06-01), Borrman et al.
patent: 5124112 (1992-06-01), Borrman et al.
Borrman Bo
Kornfeldt Hans
Kornvik Lars-Ake
Sundlof Per
Tornblom Lars
ABB Atom AB
Voss Frederick H.
Walsh Donald P.
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