Experimental Analysis Of Liquid Sloshing Behavior In Fast Reactor Vessel

As a fourth-generation reactor,the fast reactor has a large size of the overall pool structure,a thin wall and low rigidity,and contains nearly 1,500 tons of liquid sodium.In the case of earthquakes,the liquid sodium in the vessel may produce sloshing,which may produce fluid-structure interaction and damage to structures such as internal components and container walls.Therefore,in order to ensure the safety of the reactor,it is necessary to do seismic analysis of the fast reactor vessel considering the liquid sloshing effect.In the past studies of liquid sloshing,most of them were based on numerical calculations,and few tests have been carried out.However,the experimental studies carried out were simple in structure,which was different from the complex structure of the reactor.And in the process of similar relationship derivation,most of them could not strictly meet the fluid similarity,solid similarity,and similarity of coupling effects on the fluid-structure interface.In view of the above problems,this paper carried out an experimental study on the liquid sloshing behavior in container that can reflect the structural characteristics of fast reactor.Firstly,with the fast reactor as the prototype,the scaling analysis of the experiment was carried out to ensure the similarity between the experimental model and the prototype.Secondly,the reduced-scale test model was established and the shaking table tests were completed.The test parameters included structure and liquid modal characteristics,liquid sloshing wave,hydraulic pressure and structural stress were gained under sinusoidal wave and seismic wave excitation.And the response of the fast reactor prototype was obtained by similar proportional coefficient.At the same time,the experimental results have been corrected for the theoretical calculation formula of the sloshing frequency and the maximum sloshing wave height.In addition,the experiment found a new experimental phenomenon,that is,the liquid sloshing at high-order frequencies was more severe than the first-order To study the cause of the phenomenon,a simpler model was established and the shaking table test was completed.Finally,the VOF models were established by CFX numerical simulation software,and the time history analysis of liquid sloshing was carried out.The numerical simulation results were in good agreement with the experimental results,which can prove the validity of the VOF method for calculating liquid sloshing behavior.The experimental research,numerical research and theoretical research carried out in this paper can provide reference for seismic evaluation and engineering verification test of fast reactor vessel.