NOZZLE REPAIRING METHOD AND NUCLEAR REACTOR VESSEL

It is possible to improve the workability and the stress corrosion resistance by easily performing a repairing operation in a nozzle repairing method and a nuclear reactor vessel. The repairing method includes: removing a first connection portion ((trepanned portion) 208) with respect to an in-core...

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Bibliographische Detailangaben
Hauptverfasser:	HAMAMOTO TOMOCHIKA, NISHIMURA TSUYOSHI, YAMAMOTO TAKESHI, HORI NOBUYUKI, SAKASHITA HIDESHI
Format:	Patent
Sprache:	eng
Schlagworte:	COMBINED OPERATIONS MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR NUCLEAR ENGINEERING NUCLEAR PHYSICS NUCLEAR REACTORS OTHER WORKING OF METAL PERFORMING OPERATIONS PHYSICS TRANSPORTING UNIVERSAL MACHINE TOOLS
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Beschreibung
Zusammenfassung:	It is possible to improve the workability and the stress corrosion resistance by easily performing a repairing operation in a nozzle repairing method and a nuclear reactor vessel. The repairing method includes: removing a first connection portion ((trepanned portion) 208) with respect to an in-core instrument tube (204) in a groove-welding portion (206); removing the in-core instrument tube (204) from a lower mirror (66); leaving and grooving a second connection portion ((existing welding portion) 211) with respect to the lower mirror (66) in the groove-welding portion (206); inserting a new in-core instrument tube (204A) into an attachment hole (203); and groove-welding (so as to form a new groove-welding portion (213)) the inner side of the lower mirror (66) so as to fix the new in-core instrument tube (204A).