| As one of the clean energy alternatives to fossil energy,nuclear power has the advantages of high energy density and small footprint.However,the radioactive substances contained in nuclear reactors pose potential safety hazards.Therefore,ensuring the safety and reliability of nuclear-safety equipment is crucial.In order to prevent nuclear safety accidents caused by natural disasters caused by earthquakes,the design of nuclear power plants must be designed to resist earthquakes.As an important equipment to realize the safety function of nuclear island,nuclear pumps needs to be designed and verified for earthquake resistance to meet the requirements of integrity and operability according to nuclear safety regulations.Firstly,this paper starts with the seismic analysis of nuclear pumps,and systematically expounds the seismic analysis theory of nuclear pumps,domestic and foreign standards based on seismic analysis,and commonly used seismic analysis methods and applicable conditions.Secondly,taking a typical nuclear component cooling water pump as an example,the finite element software ANSYS Workbench is used to carry out modal analysis,and the appropriate seismic analysis method is selected according to the modal analysis results.Through modal analysis,it is concluded that the natural frequency of the equipment is greater than 33 Hz,so the equivalent static method can be used for seismic analysisis.Thirdly,by consulting a large number of standards and documents,the seismic analysis requirements of nuclear safety class II and class III pumps are sorted out.Among them,the component cooling water pump is a class 1A seismic item,which requires verification of structural integrity and operability during or after an SSE earthquake.At the same time,the content and evaluation criteria of integrity and operability are expounded respectively.Then,considering the combined action of pressure,earthquake and other loads,the finite element analysis software ANSYS Workbench is used to perform static analysis on the component cooling water pump.Through the extraction and calculation of the static analysis results,it is verified that the pressure boundaries meets the requirements of the RCC-M standard for structural integrity.At the same time,through the calculation and evaluation of the characteristic parameters of the operation of the pump,the conclusion is drawn that the structure meets the operation requirements.Finally,the finite element software ANSYS Workbench is used to explore the influence of geometric model processing and with or without preload on the modal analysis results.The results are compared and analyzed to provide references and suggestions for modal analysis.The seismic performance of the nuclear component cooling water pump is verified through the above analysis,and it is concluded that the component cooling water pump meets the requirements of structural integrity and operability during or after the SSE earthquake. |
