The control rod falling law and falling time of passive shutdown in sodium cooled fast reactor are important parameters for control rod design,and they are typical hydrodynamic problems.In order to ex-plain the swing and impact phenomena of control rod assembly in sodium cooled fast reactor during rod drop test,the falling process of control rod is simulated and studied by using the dynamic grid method of simulation software,the factors influencing the falling law of control rod are analyzed,and the method of buffering the falling speed of control rod is proposed.The error between the test results and the numerical simulation results is 2.44％.The main conclusions are as follows:the simulation results show that there are shaking and eccentricity phenomena in the process of control rod falling,and the shaking amplitude can be reduced by reducing the center of gravity of the control rod.The initial eccentricity and falling eccentricity of control rod have little effect on the overall falling time.The small hole at the bottom of the buffer cup does not affect the buffer effect,and the serrated groove structure on the surface of the buffer cup can ef-fectively improve the buffer effect.The cushioning effect of serrated groove is 47.2％higher than that of rectangular groove.
fast reactor componentscontrol rod dropthe law of fallingnumerical simulation
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