Dynamic Analysis Of The Ap1000 Nuclear Power Plant When Considering The Impact Of The Gravity Tank

With the rapid development of nuclear power industry in modern times,more and more attention is paid to the safety of nuclear power.In 2011,Japan Fukushima serious nuclear accident brought a deep influence on the world's nuclear power development,especially for China,so it is of great significance to study the safety of nuclear power under earthquake.Then the third generation nuclear power plant,applying passive safety system to prevent and mitigate the serious accidents,is getting many countries' attention.This paper focuses on the dynamic analysis of the containment building of AP1000 nuclear power plant in several aspects:(1)This paper introduces the theory of liquid solid coupling,and mainly introduces the CEL method,SPH method and the Housner additive quality method,then uses the ABAQUS finite element software to analyze the CEL method and the SPH method,to provide the basis of using the SPH method in the subsequent chapters.(2)Applying the ABAQUS software to establish a detailed model of containment building,and by using the simplified additive mass method(without considering the shaking mass)which is attached to the gravity tank,the modal analysis of the plant models under several conditions of different water level and ventilation vents is analyzed.The results show that the model is reasonable.(3)In order to meet the actual vibration and meet the seismic requirements of the structure,the model inputs ground motions in three directions.By applying the SPH method and simplified additional quality method(regardless of the rock mass)analyses and compares the water sloshing effects on seismic responses of the plant,and the results show that the water sloshing effect should not be neglected in the dynamic analysis,and find that the structural dynamic response increases with the increase of the water level.(4)Discusse the containment building's dynamic response with three different water levels and three different vent positions,then suggest the optimal water level and the vent position for the containment building.(5)Under non-rigid foundation conditions,when considering the effect of soil structure interaction on structural dynamic response,compare the dynamic response of the containment building with the rigid foundation and a certain type of site condition.We can conclude that the stress distribution of the structure is affected by the non-rigid foundation condition and this non-rigid foundation condition can also amplify the response of the response.