In order to understand the jet breakup behavior of the molten core material into coolant during a core distractive accident (CDA) for a sodium-cooled fast reactor (SFR), we simulate the jet breakup using the lattice Boltzmann (LB) HCZ model The applicability to jet breakup simulation by LBHCZ model is validated by the comparison with the experimental data obtained in the present study Sensitivity analyses are performed by using LBHCZ model It is shown that the jet breakup length is in good agreement with Epstein's correlation when the dominant phenomenon for the jet breakup is hydrodynamic fragmentation
