Study Of Liquid Sloshing Effects In Spent Fuel Pools In Nuclear Power Plants

In today’s context,nuclear energy is increasingly recognized as one of the world’s major energy sources,and ensuring its safety has become an indispensable and important task.However,natural earthquakes are often an unavoidable natural threat to nuclear power facilities,which are random and sudden in nature and cause uncontrollable damage to nuclear power facilities.Among the many nuclear power facilities,the pool structure is one of its important lifeline structures.It is of great theoretical significance and engineering application to study the dynamic response of the pool structure under the action of ground shaking and how to improve its seismic resistance.The broadened floor response spectrum is the basic basis for the seismic protection of the structure and a common analytical tool for the study of nuclear-related structures.The purpose of this paper is to study the shaking effect of the liquid in nuclear-related pools on the pool walls by seismic action,and to investigate and quantify the various factors affecting the variation pattern of the response spectrum by means of a broadened floor response spectrum,so as to provide a quantitative basis for the possible seismic action on nuclear-related pool structures.Based on this,the main research of this paper contains the following aspects.1.Introduces the domestic and international research related to liquid sway and liquid sway in the pool and its development history,followed by the ALE algorithm and the CFD differential format that needs to be set up to implement the ALE algorithm in LS-DYNA.2.According to the purpose and need of this paper,the spent fuel storage pool was selected as the main structure for analysis;Hypermesh and LS-DYNA finite element software were selected to model the finite element model of the pool,and the finite element model was obtained under a variety of complex operating conditions.3.The reaction spectrum of the pool wall acceleration floor was calculated for different liquid height ratios,wall thicknesses and diameter height ratios of the pool structure,and the variation of the reaction spectrum and the reasons for such variation were summarized by comparing the similarities and differences of the three,and the defined flow-solid coupling amplification factor A_FSIanalysis.4.A damping system that can effectively weaken the liquid sway effect in the pool is studied,and the effectiveness of the damping system in suppressing the liquid sway effect is roughly calculated by comparing the fluid volume of the liquid domain in the pool with and without the damping system,and the magnitude of the change in the response spectrum of the pool wall.