Repair means for steam generator heating pipe and repair method

摘要

The repair case has a circumferential flange and a tapering conical portion that are provided at two ends of the repair case. A straight section is adjoined with the tapering conical portion. The flange is welded with a plating (20) by application of tungsten inert gas so that a sealing seam is formed.The thickness of the case wall in conical portion is increased in relation to the straight section. Independent claims are included for the following: (1) a repair method of heating pipe of steam generator; and (2) a steam generator.