核级温度计套管抗震分析与疲劳评定

Seismic Analysis and Fatigue Assessment on a Nuclear Grade Thermowell

采用有限元法对某核级温度计套管进行抗震分析和疲劳评定。建立了温度计套管抗震分析和疲劳分析的力学模型,介绍了疲劳分析方法和脉动载荷及设计瞬态载荷,计算了结构的固有频率、应力强度和疲劳损伤系数,并依据ASME BPVC-Ⅲ及ASME PTC19.3TW规范进行结构应力评定和疲劳损伤评定。分析结果表明,核级温度计套管的抗震性能和疲劳寿命满足规范要求。采用的分析方法对核电厂设备的抗震鉴定和疲劳安全评定有一定的借鉴意义。

Seismic analysis and fatigue assessment were conducted on a nuclear grade thermowell by the finite element method.The mechanical model for seismic analysis and fatigue analysis were established.The fatigue analysis method and fluid pulsating load and desigen transient conditions were introduced.The natural frequency and stress intensity and the fatigue damage coefficient of structure were calculated.The structure stress and fatigue damage were evaluated according to ASME BPVC-ili and ASME PTC19.3TW standards.Analysis results show that the seismic performance and fatigue life of the nuclear grade thermowell satisfy the requirements of relevant standards.Analysis methods have some reference significance for the seismic qualification and fatigue safety assessment of equipment in a nuclear power plant.