Experimental Research And Numerical Simulation Of Water Sloshing In Fast Reactor Vessel

The safety and advanced reactor is the development direction of civil nuclear power.Liquid Metal Fast Breeder Reactor(LMFBR,fast reactor for short)is one of the reactor types to satisfy this requirement.Currently,the importance of nuclear safety is improved in the world,especially the safety performance of nuclear power plant equipments under extreme conditions have became the focus of the world.Fast reactor vessel is a large pool typed thin-wall vessel.There are heat exchanger,the main pump,core and a plenty of liquid sodium in the internal.According to the structure of fast reactor vessel,the liquid sodium can produce sloshing under the seismic action.The hydraulic pressure acts on the container wall may creat destruction to the container and internals.It may also produces large moment and destroies the support of main container.The design of embedded parts and the support skirt may be affected.In order to ensure the structural integrity of the components with earthquake cases,so as to ensure the safety of the reactor,it is necessary to make a research of seismic analysis of fast reactor considering liquid sloshing.Due to plenty of internals in fast reactor,there are complex fluid domain and complex nonlinear sloshing behavior.So this article presented a scaling analysis technique and built a test bench which looks the fast reactor ontology as the prototype.Through the shaking table test,we studied the liquid sloshing phenomenon,mesured the frequency of test model’s structure and liquid sloshing.What’s more,the sloshing wave height,acceleration of structure and hydraulic pressure were measured under sine wave excitation.ANSYS numerical simulation software was also used to establish the finite element model of test model.The water in the annular region was simulated by two kinds of 3D fluid elements.Modal analysis was made to get the structural natural frequency and the liquid sloshing frequency.We compared the nummerical results with experimental results and the concident conclusion vertified the accuracy of numerical simulation.We also provided a reference for fast reactor seismic analysis.