| Nuclear power generation is a highly efficient,low-carbon and environmental protection industry that has been vigorously developed all over the world in recent years.Due to the advantages of nuclear power,the share of nuclear power in China's electricity generation is gradually increasing.In 2019,Nuclear power generation stood at 348.131 billion kwh,accounting for about 4.88 percent of the total electricity generation.However,the safety of nuclear power has also been widely valued by everyone.The nuclear accident in Fukushima,Japan,on March 11,2011 sounded the alarm for nuclear safety once again.The anti-seismic design and safety appraisal of nuclear power plants all need to analyze the structure and equipment of the nuclear power plant.In the current research,there is still a lack of consideration for the coupling between equipment and structure.This article will study the coupling between equipment and structure in NPP.In the analysis,some equipment and structures have obvious interactions,while some equipment has a small impact on the structure.Safety appraisal provides the basis for coupling between equipment and structures.For the various nuclear power plants forms today,this paper takes the structure and equipment of the third-generation nuclear power plants that are widely used now as the analysis object.The large-scale general finite element software ABAQUS is used as the analysis tool to analyze the dynamic response of the equipment and structure of the nuclear power plant,and explore the interaction mechanism of equipment and structure under the action of earthquake.First,according to the "code of seismic design of nuclear power plants "(GB50267-97)and the "Standard Review Plan" 3.7.2 of the American Standard Review Program,determine the selection basis for the structure and equipment that need to consider the coupling effect in the nuclear power plant.The containment vessel,PCS gravity water tank and polar crane.According to the structure and equipment data of the thirdgeneration nuclear power plant.the ABAQUS finite element software was used to establish the finite element model considering the equipment-structure coupling effect.The equipment has a PCS gravity tank containing liquid,so the ABAQUS/CEL fluidsolid coupling analysis method was introduced.Time history analysis of finite element model is carried out and the Rayleigh damping of the structure is determined.Using the US RG1.60 spectrum as the target spectrum to generate artificial seismic waves.Input the ratio of 1: 1: 2/3 in two horizontal and vertical directions.The acceleration response,displacement response and stress of the structure are obtained.Based on the established finite element model,the influence of the location and load of the annular crane on the seismic response of the containment vessel is studied.The results show that the load of the crane will reduce the peak dynamic response of the containment structure within a certain load range.The larger the crane load is,the more obvious the reduction of peak acceleration and displacement is to the containment structure.The change of crane position has little influence on the dynamic response of containment..Take the PCS gravity water tank and containment vessel as the analysis objects.The artificial seismic wave generated by US RG1.60 spectrum is used as input.The dynamic response of the containment vessel was calculated by controlling the water tank at seven different water levels.The analysis results show that the gravity tank of the containment has obvious influence on the seismic response of the containment.Through the above analysis,the influence degree of PCS gravity tank and ring crane on the dynamic response of containment building is basically determined.The study in this paper can provide reasonable Suggestions for seismic resistance of nuclear power plant structures and equipment in practical engineering.. |
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