摘要
在地震工况下,核电站空调水系统弹簧式安全阀需要保持其结构完整性和可运行性。本文通过公式法完成安全阀的关键部位结构设计,以及螺栓预紧力和接管载荷的计算分析,通过有限元分析法完成安全阀的抗震分析。首先,建立安全阀有限元模型,借助有限元软件完成模态分析;然后,确定第一阶频率大于截断频率33 Hz后,使用等效静力法完成安全阀的抗震分析;最后,根据ASME核电规范对安全阀进行应力评定和强度校核。计算结果表明,安全阀各部件在地震工况下均满足强度和变形要求。本文的分析方法对核电站安全阀抗震设计有很好的工程实用价值。
Under earthquake conditions,spring type safety valves of air conditioning water systems in nuclear power plants need to maintain their structural integrity and operability.In this paper,the design of the key parts of the safety valve,the calculation of the bolt pre-tightening force and the connection load were completed by the formula method.The finite element analysis method was used to complete the seismic analysis of the safety valve.Firstly,the finite element model of safety valve is established,and modal analysis is completed by means of finite element software.After determining that the first-order frequency is greater than the cutoff frequency of 33 Hz,the seismic analysis of the safety valve is completed by using the equivalent static method.Finally,the stress assessment and strength check were completed according to the ASME nuclear power code.The calculation results show that all parts of the safety valve meet the strength and deformation requirements under seismic conditions.The analysis method used in this paper has very good engineering value for the seismic design of safety valves in nuclear power plants.
作者
张强升
王德军
史强
陈一伟
沈伟
李亮
Zhang Qiangsheng;Wang Dejun;Shi Qiang;Chen Yiwei;Shen Wei;Li Liang(Nuclear and Radiation Safety Center,MEE,Beijing 100082,China;Ministry of Ecology and Environment,MEE,Beijing 100006,China)
出处
《核安全》
2020年第6期133-141,共9页
Nuclear Safety
关键词
安全阀
抗震分析
有限元
模态分析
地震载荷
应力评定
safety valve
seismic analysis
finite element
model analysis
earthquake load
stress evaluation
