Seismic Response Analysis of Circulation Pump in AP1000 Nuclear Power Plant

To investigate the large double-base vertical mix-flow circulation pump used in AP1000 nuclear power plant,using the security shut-down earthquake load as the design seismic load,the dynamic characteristics and seismic response of sea water circulation pump under seismic load are analyzed,and the operability during SSE load is evaluated.The results demonstrated that the first natural frequency is about 17.5 Hz,and its low-order mode shapes are almost lateral bending in pump case.The combined results of response spectrum and static analysis of pump demonstrate that,the max combined stress on pump case is 173 MPa,and the max.deformation is 4.4 mm.