【摘要】 在设计阶段考虑环境对疲劳的影响是第三代核电站一回路主设备设计的关键技术之一,本文介绍了ASME规范Code Case N-792对轻水堆(LWR)一级承压设备考虑环境影响疲劳时的环境影响疲劳修正系数(Fen)和应变速率ε’的计算方法。建立反应堆压力容器接管的轴对称模型,并根据Code Case N-792的要求对一回路主设备反应堆压力容器接管进行考虑环境影响的疲劳计算,计算时分别采用简化法和详细积分法。对不考虑环境影响的ASME第III卷的疲劳计算结果和Code Case N-792的疲劳计算结果进行对比和探讨。当考虑环境影响后,SCL1截面的疲劳寿命缩短为空气状态下的1/3,SCL2截面的疲劳寿命减少了3/5。更多还原

【Abstract】 Background: Considering the EAF(Environment Assistant Fatigue) effect during the design status is a key issue for generation III nuclear power plant.Purpose: The calculation methodology of Fen(Environmentally Assistant Fatigue Factor) and strain ratio of ASME Code Case N-792 has been introduced in this paper.Methods: By creating 2D symmetry model of reactor pressure vessel nozzle,the environmentally assistant fatigue factor Fen and fatigue usage factor has been analyzed according Code Case N-792 with simplified and detailed integral methods.Results: The fatigue usage factor results of ASME-III which does not consider environmental effect and Code Case N-792 which consider the environmental effect have been compared and discussed.Conclusions: And the fatigue life considering Fen effect of SCL1 section will reduce to about 1/3 of the life in air condition while the fatigue life of SCL2 decrease 3/5.更多还原