国产反应堆压力容器材料—回路水环境疲劳设计曲线初探

Fatigue Design Curves for Domestic Recctor Pressure Vessel Steel in Primary Water

硫含量、应变速率、温度、水中溶解氧含量等环境因素对反应堆压力容器(RPV)材料在高温高压水中环境疲劳寿命有重要影响。分析了将环境因素引入疲劳设计曲线的几个主要模型:统计模型、修正因子模型和国内新提出的模型(Wu模型)。分别采用这三个模型对国产RPV材料环境疲劳设计曲线进行了计算,并将计算结果与ASME规范中的疲劳设计曲线进行了对比。在应变幅值低于0.15%时,ASME曲线更保守,而应变幅高于0.15%时,结果相反。

The effects of environment factors such as S content, stain rate, temperature and dissolved oxygen on the corrosion fatigue behavior of steels for reactor pressure vessel （RPV） in high temperature and high pressure water are reviewed. The difference of existing fatigue design models involving environmental factors is discussed also. The fatigue design curve of a domestic made low alloy RPV steel was calculated by using statistical model （ANL model）, fatigue correction factor model （EFD model） and a new model proposed （Wu model）. A comparison of the calculated data and ASME fatigue design code was made. The results show that ANL model, EFD model and Wu model were relatively conservative when the stain amplitude was higher than 0. 15%, while ASME fatigue design code was more conservative if the stain amplitude was less than 0.15%.