Method for extracting a locking sleeve from a demountable guide tube of a nuclear reactor fuel assembly
US5091142A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Sep 19, 1989 |
| Grant date | Feb 25, 1992 |
| Priority date | — |
| Expiry date | Sep 19, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/53657
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Each of the zones of the ferrule (25) comprising a radially projecting deformed part (29) is deformed by inward bending, so as to extract the deformed part (29) from a corresponding cavity (22) of the end block. The locking sleeve (20) is then extracted by exerting a pulling force on this sleeve (20) in the axial direction (ZZ') of the guide tube (4). Preferably, the ferrule (25) consists of cylindrical segments separated by slits arranged along the generatrices of the ferrule (25). A tool (31) is used to fold the segments of the ferrule (25) and to grip these segments so as to extract the locking sleeve (20). Extraction is performed underwater in a fuel storage well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.