快堆中心柱低周疲劳可靠性评价

Low Cycle Fatigue Reliability Evaluation of Central Column in Fast Reactor

采用蒙特卡罗方法对中心柱设计过程中的主要影响因素——低周疲劳进行可靠性评价,为中心柱包覆层设计提供设计依据和可靠性支撑。使用ANSYS软件对中心柱进行热分析和结构分析,利用ASME规范对其累积疲劳损伤进行评价,采用拉丁超立方抽样方法对其进行可靠性计算。计算结果表明:中心柱低周疲劳可靠度为0.808,在2.5%的显著水平下中心柱低周疲劳破坏的敏感因素为紧急停堆次数、焊缝、中子辐照,建议在中心柱外侧增加包覆层。

Monte Carlo method was used to evaluate low cycle fatigue reliability which was the main influence factor in the design of central column,and it provided design basis and reliability support for the cladding design of central column.ANSYS software was used to conduct thermal analysis and structure analysis of central column,then its cumulative fatigue damage in lifetime was evaluated by ASME code,and the reliability analysis was carried out through hypercube Latin sampling.The results show that the reliability of central column is 0.808,and under the significance of 2.5%the most sensitive factors for low cycle fatigue failure of central column are the times of emergency shutdown,welding and irradiation.It is suggested that the cladding should be added to central column.