Preventive maintenance method and apparatus of a structural member in a reactor pressure vessel
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United States of America Patent
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Oct 28, 2003
Grant Date -
Oct 31, 2002
app pub date -
Jan 15, 2002
filing date -
Aug 12, 1998
priority date (Note) -
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Abstract
A preventive maintenance method and apparatus for a structural member in a reactor pressure vessel according to the present invention reduce a tensile residual stress on a surface of the structural member by impinging a water jet from a nozzle onto a plane surface of a deflector to thereby change direction of flow of the water jet, and impinging the water jet after being deflected onto the surface of the structural member. This method and apparatus are applicable to a narrow space portion, and can improve a residual stress on the surface of the structural member and can also prevent damage such as stress corrosion cracking.
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