【発明の名称】中性子束モニタハウジングの熱処理装置

Japanese Patent JP2581605

B2

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.

ENOMOTO KUNIO
OOTAKA MASAHIRO
HASEGAWA KUNIO
HAYASHI MAKOTO
SAKATA SHINJI
SAITO HIDEYO
KUROSAWA KOICHI
SAITO TAKASHI
KARATSU YOSHINORI
ITO MOTOYA

JP13480390A

February 12, 1997

May 24, 1990

Click for automatic bibliography generation  

HITACHI LTD

G21C19/02; B23K13/01; G21C13/00; G21C13/087; G21C17/10; G21C19/20; (IPC1-7): G21C19/02; G21C17/10; G21C19/20

JP2105097A
JP2102494A
JP298695A
JP5460694A
JP5954470U

Tatsuyuki Unuma (3 others)

Previous Patent: 門型パネルの基礎構造

Next Patent: 内燃機関用油圧式ラッシュアジャスタ