Method of repairing a nuclear assembly
US5209895A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1990 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | May 29, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E30/30
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method of repairing a nuclear power facility metal component assembly with a "Class A" fastening between hard metal parts (12,14) includes several steps they are: PA0 providing aligned openings (20,22) in a plurality of hard metal parts (12,14) to be assembled; PA0 EDM machining a non-cylindrically shaped cavity (16) which is analogous to a counterbore having a cavity opening (24) smaller than the cavity base (18); PA0 inserting a locking collar (10) with a central aperture (32) and surrounding flange (3) to receive a bolt head (42) and with weakened zones of deformation (34) through the cavity opening (24); PA0 inserting a headed and threaded bolt (40) through the central aperture (32) of the locking collar (10) and into the aligned bores (20,22); PA0 providing threads (46a) in another of the hard metal parts to mate the bolt threads (46); PA0 torquing the bolt (40) in the provided mating threads (46a) to draw the bolt head (42) toward the cavity base (18) and deforming the locking collar at its weakened zones of deformation (34) to cause it to expand to an overall dimension which prevents its passage out of the cavity opening (24); and, PA0 deforming the flange (30) to interfer…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.