Preventive maintenance method and apparatus of a structural member in a reactor pressure vessel
US6341151B1 · kind B1 · utility
14Cited by
16References
11Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Aug 29, 2000 |
| Grant date | Jan 22, 2002 |
| Priority date | — |
| Expiry date | Aug 29, 2020 |
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.