对核电站压力管前后两次在役检查缺陷数据变化的原因进行了分析,认为缺陷表面不平整和检查系统误差是影响检查精度的主要因素,两者共同作用使检查数据服从正态分布规律.经过分析,得到缺陷并未明显扩展的结论.%After analyzing the reasons for the change of defect datum from in-service inspections of the nuclear power plant pressure pipe, it was concluded that surface roughness and the system error were the main factors of affecting inspection accuracy, both of them made the inspection datum comply with the normal distribution rule. After analysis, The conclusion that the flaw defects had not significantly extended was gotten.
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