核电厂金属疲劳监测过程中环境影响疲劳评价方法研究

Research on Evaluation Method of Environmental Impact Fatigue in Process of Metal Fatigue Monitoring in Nuclear Power Plant

轻水反应堆中金属部件的环境影响疲劳寿命(EAF)问题近年来一直是国内外核安全设备研究和监管所关注的重要问题。本文对日本和美国的相应试验研究数据进行了深入分析,对环境影响疲劳修正系数Fen的计算公式进行了分析讨论,总结出不同金属材料Fen计算结果的保守性以及关键影响因素的敏感性。结合我国的实际情况,借助Fen修正计算公式,给出了一种核电厂金属疲劳监测过程中开展环境影响疲劳的评价方法。结果表明:现阶段可基于核电厂监测的真实瞬态数据采用Fen修正公式对环境影响因子进行估算,对于同类型的金属材料,不同试验环境拟合的Fen公式计算结果非常接近,但EAF问题在金属部件疲劳寿命评估过程中不可忽视。

In recent years,the environmental assisted fatigue(EAF)of metal parts in light water reactor has always been a major concern in domestic and international nuclear safety equipment research and regulation.In this paper,the corresponding experimental research data of Japan and U.S.were analyzed in-depth,and the conservative of the F en calculation result of different metal materials and the sensitivity of the key influence factor were summarized as well.And in combination with domestic actual situation,an assessment method of performing environmental impact fatigue during the process of metal fatigue monitoring in the nuclear power plant was provided with using the F en correction formula.The result shows that the estimation of environmental impact factor can be carried out at the moment based on the monitoring real transient data in the nuclear power plant with using the F en correction formula.For the same type of metal materials,the calculation results of fitted F en formula are very close under different test environments,but the EAF issue in the process of fatigue life assessment of metal parts is not negligible.