Fig. 1. The module division of reactor pressure vessel (a) The nodalization in axial direction of pressure vessel, (b) The nodalization in radial direction of lower head

Fig. 2. The melt stratification and the temperature

Fig. 3. The thickness distribution of each layer of melt stratification

Fig. 4. The liquid flow rate of selected nodes in the lower head

Fig. 5. The void fraction of selected nodes

Fig. 6. The fluid temperature of the selected nodes

Fig. 7. The decay heat and heat transfer in the lower head

Fig. 8. Comparison curve of the surface thermal conductivity and CHF

Fig. 9. The temperature distribution of nodes in lower head along Y axis

Fig. 10. The thickness distribution of lower head along Y axis