Safety Analysis Of Nuclear Power Plant Shield Building Under Earthquake And Aircraft Impact

In recent years,the development of nuclear power has been vigorously promoted.As one of the most important barriers to ensure the safety of nuclear power plants,the containment structure has received widespread attention.As the service life of nuclear power plants continues to increase,the ground motion is a structural factor that must be considered.In addition to the effects of earthquakes,under the influence of the “9·11” terrorist attacks in the United States,aircraft impact has also become one of the most important factors affecting the performance of containment structures.According to the “Thirteenth Five-Year Plan”,the China government will develop nuclear power facilities based on AP1000 type third-generation technology.This thesis will focus on the structural performance of the AP1000 nuclear power plant containment under the action of strong earthquakes and large commercial aircraft,and discuss its potential structural safety issues.The main work and research results of this thesis are as follows:1)Taking Hualong One nuclear power containment as an example,the application of BIM technology in nuclear power plant containment modeling and data storage is introduced.At the same time,this modeling method is applied to the AP1000 type nuclear power plant containment vessel.The BIM model is used to store model data to facilitate the establishment of AP1000 nuclear power plant containment in other finite element softwares.2)Establish the AP1000 nuclear power plant containment vessel in LS-DYNA and MSC.MARC respectively,and verify the correctness of the model by comparing the containment period and vibration.The collision contact algorithm,hourglass algorithm and fluid-structure coupling algorithm in LS-DYNA explicit dynamic calculation software are introduced,and the correctness of these algorithms is verified.3)The collision process of large commercial aircraft impacting the nuclear containment structure is calculated and analyzed,and the failure modes of the containment structure are illustrated.The dynamic responses of the containment structure subjected to different influencing factors are discussed.The influencing factors include the water level of the water tank,the initial velocity,the impact position,and the style of the containment structure.It is concluded that the water level of the water tank has little effect on the response of the containment structure under the impact of the aircraft.4)According to HAD101-04 "External Artificial Events for the Selection of Nuclear Power Plant Sites",an artificial ground motion meeting the requirements is generated.The structural response of the AP1000 nuclear power plant containment under this ground motion is analyzed.The influence of different water levels,fluid simulation methods,and the water tank baffle on the structural performance of the containment is also discussed.The optimal water level is 80% of the volume of the tank.5)The calculation process using non-coupling methods which are commonly used in containment safety assessment is introduced.The differences between the calculation results of non-coupling methods and that of coupling methods are discussed,and the reasons for the differences are analyzed from various aspects.