The characteristics of nuclear-powered steam generator stress corrosion cracking and the tridimensional distributing regularity on pipes were detected by means of macroscopic examination of naked eye, pigmentation inspection, supersonic flaw detecting and single pipe pump pressure experiment and so on; 采用肉眼宏观检查、着色探伤、超声波探伤和单管泵压试验等方法探明了蒸汽发生器的应力腐蚀破裂特点和在管束表面上的立体分布规律。