Assessment of Weld Joints of Steam Generator of Prototype Fast Breeder Reactor by Microfocal Radiography

摘要

The tube to tubesheet (TTS) welds of steam generator of Prototyps Fast Breeder Reactor (PFBR) ars quite critical. Sodium flows on Shell side and water on tube side. Any failure would thus be catastrophic. Apart from defects such ?s porosities, wall thinning due to concavity is endemic in such joints and needs to be detected. This paper presents the methodologies deveioped for quantitative evaluation of defects including wall thinning due to concavity in the TTS welds by micmfocal radiography. The method has beert suceessfully adopted in the shop fioor for the evaluation of TTS welds of steam generator and evaporator.