| 摘要 |
The device comprises a sleeve (1) and a stopper (5). The inside bore of the sleeve (1) comprises a part having a diameter smaller than the outside diameter of the stopper (5) and ending in a shoulder (2c), against which the stopper (5) comes to bear. Swaging (9) enables the stopper (5) to be fixed in the sleeve (1). The fastening is completed by three sealing welds (10a, 10b, 10c), between which are provided an aperture (4) passing through the side wall of the sleeve (1) and an aperture (8) passing through the side wall of the stopper (5). The device is used in particular for closing holes in a tubular plate of a steam generator of a pressurized water nuclear reactor. |
