Preventive maintenance method and apparatus of a structural member in a reactor pressure vessel
US6639962B2 · kind B2 · utility
5Cited by
24References
5Claims
0Family size
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Key dates
| Filing date | Jan 15, 2002 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Jan 15, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E30/30
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.