Steam generator heating tube repair device and repair method

A steam generator heating tube repair method for a steam generator heating tube installed in a steam generator and having a defective tube end and further having a multiplicity of steam generator heating tubes passing through respective tube plates, said tube plates being welded to a cladding, the method which comprises:

• conical milling out of the defective tube end and milling a depression into the cladding around the defective tube end, said conical milling out defining an inner contour of the defective tube end;
• inserting a steam generator heating tube repair sleeve into said conically milled-out defective tube end;
• said steam generator heating tube repair sleeve including a conical region, an encircling flange, and a straight region, said conical region having two ends and being tapered on an outside of said conical region toward a first of said two ends, said conical region having an outer contour, said conical region having a wall thickness, said encircling flange merging into said conical region, said encircling flange being disposed on a second of said two ends of said conical region, said straight region being adjoined to said first of said two ends of said conical region, said straight region having a wall thickness;
• and said wall thickness of said conical region being greater than said wall thickness of said straight region;
• said outer contour of said conical region matching said inner contour of said milled-out defective tube end;
• rolling in the steam generator heating tube repair sleeve in at least one of said straight region and said conical region;
• and
• welding said encircling flange of said rolled-in steam generator heating tube repair sleeve to said cladding to form a sealing seam.