Preliminary Analysis of Flow Induced Vibration for AP1000 Secondary Core Support Assembly

The secondary core support assembly of Advanced Power Plant（AP1000） is modeled using the finite element methods（FEA）.Modal analysis and flow induced vibration（FIV） analysis without flow skirt for secondary core support assembly are performed.The natural frequency of AP1000 secondary core support assembly is smaller than that for Qinshan Phase I NPP with the same modal shape,which is produced by the combined effect of smaller stiffness and weight.Furthermore,the method of FIV analysis with fluid-structure coupling effect is studied.Three schemes that are full model,simplified shell model and single beam model for FIV analysis with fluid-structure coupling effect are proposed.