Scratch-induced Stress Corrosion Cracking for Steam Generator Tubings

This paper introduces some cases of scratch-induced stress corrosion cracking (SISCC) of steam generator tubings in pressurized water reactor (PWR) and current studies at home and abroad. The effect of scratching on the microstructure, residual stress and corrosion performance of materials after scratch and the mechanism of SISCC are discussed. The causes of scratches and control method are introduced, the significance of scratch control for reliability of in-service steam generator tubings is emphasizeed.