在役环境下典型核设备疲劳累积使用因子的计算

Calculation of Fatigue Cumulative Usage Factor for Nuclear Equipment under In-Service Environment

核设备设计寿命的计算需要考虑在役环境的影响,但由于当前通用各规范疲劳曲线均未涉及在役环境影响,因此可通过环境因子对疲劳累积使用因子进行修正。在环境因子修正过程中,提出3种不同的参数值修正方法。基于上述方法对疲劳累积使用因子进行修正,同时与空气环境下疲劳累积使用因子进行对比。对比发现,考虑在役环境的疲劳累积使用因子比空气环境中疲劳累积使用因子有明显提高。另外,对热-结构场结果直接进行环境因子的参数值转化比瞬态组合后进行参数值转化更为保守。

Calculation of nuclear equipment design life should consider the influence in service environment. Because the fatigue curves in current regulation do not take into account the impact of in-service environment, the fatigue cumulative usage factor can be modified by the environmental fatigue correction factor. During the correcting, three kinds method have been proposed. Based on above different methods, the fatigue cumulative usage factor has been corrected separately. Meanwhile, the results have been contrasted with each other and the results under air environment. The results showed that the fatigue cumulative usage factor bigger than it under air environment. Furthermore, parameter transformation of environmental fatigue correction factor with results of thermal-structure field calculation more conservative than with the results of transient combination.