Method of maintaining housing of reactor pressure vessel and hea

Details Method of maintaining housing of reactor pressure vessel and hea Method of maintaining housing of reactor pressure vessel and hea

1991-05-22

1994-07-12

Reynolds, Bruce A.

Electric heating

Inductive heating

Metal working

219607, 219611, 219614, B23K 1301

Patent

active

053290992

ABSTRACT:
A method of maintaining the housing of a reactor pressure vessel having: a reactor pressure vessel into which cooling water is introduced; a cylindrical housing which penetrates an end bracket of the reactor pressure vessel; and a circumferential weld for securing the intermediate portion of the housing to the reactor pressure vessel by welding, the method of maintaining a housing of a reactor pressure vessel comprising the steps of: remaining the cooling water in the reactor pressure vessel; preventing leakage of the cooling water in the reactor pressure vessel through the housing by sealing the housing; making the inside portion of the housing lower than the seal to be a hollow space of a gas atmosphere; heating a heat affected zone due to welding by using a heating device inserted into the hollow space from a lower portion so as to compressive-yield the inner surface of the housing in the heat affected portion upper than the circumferential weld and tensile-yield the outer surface; and cooling heated portion inside of the housing, which has been yielded, so as to tensile-yield the inner surface of the housing by using a cooling device inserted into the housing from a lower portion, whereby compressive stress is allowed to remain in the tensile-yielded portion.

REFERENCES:
patent: 3525842 (1970-08-01), Steinhoff et al.
patent: 3757072 (1973-09-01), Delpaggio
patent: 4309583 (1982-01-01), Krauss et al.
patent: 5022936 (1991-06-01), Tsujimura et al.
patent: 5047201 (1991-09-01), Schmidt et al.
patent: 5085569 (1992-02-01), Dauphin
patent: 5227124 (1993-07-01), Saito et al.

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