Performance Analysis Of New Containment Structure Under Pressure Seismic Coupling And Impact Load

With the development of society and the progress of science and technology,the contradiction between the growing demand for energy and the gradual exhaustion of traditional non-renewable energy is becoming more and more serious.Nuclear power is the best choice for the adjustment of China’s energy structure in the future.As the last physical barrier to ensure the safety of nuclear power plants,the safety of containment has always been concerned by designers.In this paper,a new generation of self-developed containment in China is taken as an example to study its performance under the coupling action of internal pressure and temperature,and its dynamic characteristics under the action of earthquake and impact.The main research contents are as follows:（1）Based on ABAQUS finite element software,three-dimensional space programming modeling technology and separate modeling method are adopted to establish a fine finite element simulation model containing two types of complex three-dimensional prestressed reinforcement and multilayer ordinary reinforcement.In addition,the mesh sensitivity and prestress loss are discussed.（2）The gradient distribution of incidental temperature of nuclear reaction in the containment is calculated,and the necessity of temperature effect in internal pressure analysis is judged by comparing the calculation results of two models of applied temperature and neglected temperature.On this basis,internal pressure load is gradually applied to the containment to investigate the service performance and failure mechanism of the new containment components under the action of excess internal pressure and temperature.（3）Referring to relevant codes,six different working conditions of seismic design are determined to explore the damage of the new containment components under the coupling action of overdesign earthquake and internal pressure and temperature,as well as the variation rule of displacement,acceleration,bottom shear and other indexes with peak acceleration and internal pressure.（4）The big data statistical method is used to draw the distribution diagram of the failure modes of five points outside the containment,and according to this,the failure types under various impact conditions are predicted.In addition,through polynomial fitting,the maximum impact deformation formula that may be caused when the impact objects with different mass and velocity impact the weakest point D at different angles is obtained:D（7）a,m,s（8）（28）1.1C（7）a（8）C（7）m（8）C（7）s（8）D₀.In this paper,the service performance of the new type of containment under the coupling action of internal pressure and temperature,the dynamic characteristics under earthquake and shock action are revealed through numerical simulation,which makes up for the lack of domestic research on this type of containment,and provides a theoretical basis for the design and health monitoring of prestressed nuclear power plant containment in China.