基于RCC-M与ASME的核2/3级管道应力评定比较

Comparision between RCC-M and ASME for Stress Evaluation of Nuclear Safety Class 2/3 Pipes

RCC-M《法国压水堆机械设备制造与设计规范》和ASME《美国机械工程师协会标准》为目前核电厂广泛采用的技术标准,两者对压水堆核2/3级管道应力评定的规定相似但不完全相同。论述了核2/3级管道应力分析及评定的方法;总结了RCC-M规范和ASME标准对核2/3级管道应力评定的要求,比较了不同载荷工况下两者的差异;以某管道为例,应用PIPESTRESS软件分别按照RCC-M规范和ASME标准对其进行应力评定。结果表明:总应力计算结果与应力增强系数和一次应力指数关系密切,RCC-M规范侧重压力的影响,ASME标准侧重自重及偶然荷载的影响。在内压为零及内压不大的情况下,ASME相对RCC-M更偏于安全。而对于内压较大,自重及偶然荷载的影响较小的情况下,RCC-M相对ASME更偏于安全。

RCC -M Design and Construction Rules for Mechanical Components of PWR Nuclear Islands and ASME American Society of Mechanical Engineers are widely used in China. They are similar specifica- tions with differences. It discusses the stress analysis and evaluation methods for nuclear safety class 2/3 pipes, summarizes the requirements of RCC - M and ASME about stress evaluation and compares the differences. Such as the application of PIPESTRESS for the evaluation of stress, respectively according to RCC -M and ASME, shows that the total stress calculation results is closely related to stress increase co- efficient and stress index. RCC - M standard focuses on the influence of pressure, and ASME standard fo- cuses on the influence of gravity and accidental loading. When the internal pressure is lesser, ASME is relatively safer. When the internal pressure is bigger, and the gravity and accidental loading is lesser, RCC -M is relatively safer.