Research on Transient Flux Distribution in Parallel Channels

When multi-channels model is used for thermal-hydraulic analysis in reactors with closed fuel lattice,the mass flux distribution must be solved at first.Three methods for mass flux distribution are proposed.Transient flux distribution program is developed to calculate the mass flux distribution in parallel channels and the results are compared.The results show that the first method is only proper for slow transients but the second and the third methods are also proper for fast transients.However,the stability of the third method is higher than the second method.So the third method can be used for mass flux distribution calculation in plate type fuel parallel channels.