Fig. 1. Schematic diagram of multi-bubble slug boiling model

Fig. 2. ISAA-Na core thermal hydraulic calculation process

Fig. 3. Schematics of the CABRI reactor

Fig. 4. Nodalization of a fuel pin in ISAA-Na

Fig. 5. Axial power profile used in ISAA-Na

Fig. 6. Axial profile of the coolant pressure and cladding temperature at steady state conditions

Fig. 7. Axial coolant temperature profiles at steady state conditions

Fig. 8. Inlet flow rate during the transient

Fig. 9. Outlet flow rate during the transient

Fig. 10. Axial coolant temperature at t=20 s

Fig. 11. Coolant temperature evolution at 77 cm and 39 cm BFC during transient

Fig. 12. Coolant pressure evolution at bottom and top of the fuel column

Fig. 13. Sodium two-phase interface during BI1 test