Method and structure for preventive maintaining an elongated metal hollow member
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United States of America Patent
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Jul 13, 1993
Grant Date -
N/A
app pub date -
Aug 2, 1990
filing date -
Aug 4, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An ICM housing welded to a wall of a reactor pressure vessel in operation is provided with a molten metal layer containing 4 wt. % or more .delta. ferrite at a portion of an inner peripheral surface thereof which corresponds to a weld. A sleeve made of stainless steel is located at the competent portion of the inner peripheral surface of the ICM housing stainless steel so as to be molten by means of a TIG welding machine to form the molten metal layer. The molten metal layer prevents stress corrosion cracking of the ICM housing.
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