AP1000核电厂海水循环泵地震响应分析

Seismic Response Analysis of Circulation Pump in AP1000 Nuclear Power Plant

针对AP1000核电厂大型双基础立式循环泵机组结构,以安全停堆地震作为设计地震载荷输入,采用响应谱法对海水循环泵在地震载荷下的动态特性和响应进行分析,并对其在安全停堆地震工况下的可运行性进行评估。结果表明,该泵的1阶自然振动频率约为17.5 Hz,其低阶振型以泵体结构的横向弯曲振动为主。根据响应谱分析与静力分析叠加的结果,地震工况下的泵体最大组合应力为173 MPa,最大变形量为4.4 mm。

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.