The accurate simulation of transient criticality accident is a key factor in critical safety assessment of nuclear fuel solution system.However,the existing radiolysis gas models contain many empirical parameters,which result in significant deviations in the prediction of the power characteristics.To improve the simulation accuracy and avoid relying on the empirical parameters in the model,the radiolytic gas model needs to be improved.Based on the analysis of radiolysis gas behavior in solution and simplified assumptions,a conservation model including radiolytic gas concentration,mass per unit volume of radiolytic bubbles and number of density bubbles was established.This model was coupled with a point reactor kinetics model and a two-dimensional heat conduction model to develop a two-dimensional transient analysis code for solution systems.The code was verified with the Japanese TRACY experiment.The results show that the simulated values of the code are in good agreement with the experimental data,and the improved model can accurately simulate the power change of the solution system during critical accidents.
Nuclear fuel solution systemCritical safetyRadiolytic gas model
维普
万方数据
