核电厂关键设备事故工况下密封性能研究

Research on the Tightness Analysis of Key Equipment in Nuclear Power Plants

本文应用ANSYS软件对安全壳人员闸门承压部件和密封结构建立了有限元模型,分析了人员闸门在事故工况下的密封性能。采用实体单元建立内筒节和外筒节主要承压部件、密封门以及锁紧轴销的模型。计算结果表明,事故工况下,门板和门框变形产生的相对位移小于密封圈所需压缩量,锁紧轴销的剪切强度小于许用值,密封性能满足要求。本文采用的有限元分析方法综合考虑了设备自重、压力载荷、通过载荷以及SSE地震载荷等各种复杂因素对人员闸门密封性能的影响,该方法对人员闸门在事故工况下的密封性能设计和校核具有一定的实际意义,对核电厂内其他设备密封结构的设计和研究具有借鉴意义。

In this paper,ANSYS software is used to establish the finite element model of the pressurized parts and sealing structure of the personnel air lock in the containment,and the sealing performance of the personnel air lock under the accident condition is analyzed.The models of main pressure parts,sealing door and locking shaft pin of inner and outer shell sections are established by using solid unit.It can be seen from the results that the relative displacement caused by the deformation of seal door and the frame is less than the required compression of sealing ring,and the shear strength of locking pins is less than the allowable value,so the sealing performance can meet the design requirements.Several factors are taken into account during the finite element analysis in order to obtain the accurate results,such as the self-weight,the pressure,the conveyance load and the safety shutdown earthquake(SSE)and so on.The analysis method and results have an important meaning for the design of personnel air lock.It also can be used for reference to the design of internal sealing mechanism in other equipment of nuclear power plants.