DEVICE FOR SEVERING A TUBE OF A TUBE BUNDLE TERMINATING IN A TUBE SHEET

1. A device for severing a tube (2) in a tube plate (5) comprising a hollow shaft (44) with an axis which is parallel to the tube (2) and having an eccentric bore (48), where in the bore (48) a tube (50) is positioned which has an eccentric cylindrical inner space (51) in which a driving shaft (53) is mounted which, at the end of the tube (50) which faces the tube plate (5), carries a cutting tool (60) outside said tube and at the end of the tube (50) facing away from the tube plate (5) is provided with a drive, and where the hollow shaft (44) and the tube (50) can be rotated with respect to one another through 180 degrees, characterised in that, in order to repair steam generators (1) in nuclear power stations which have a bundle of parallel rectilinear tubes (2) which terminates in the tube plate (5), the hollow shaft (44) is rotatably mounted in a plate (16) which for securing to the tube plate (5) grips within the tubes (2) by means of expanding mandrels (17) ; that the hollow shaft (44) and the tube (50) are coupled to one another by means of a gear wheel pair having a pinion (39) which is many times smaller than the contra-wheel (41) assigned thereto and whose movement is remotely controlled ; and that on the side of the plate (16) remote from the tube plate (5), the hollow shaft (44) is provided with a flange (33), on which acts a motor (18) which is secured to the sheet (16) and serves for rotating the hollow shaft (44).