Fig. 1. Staggered grid

Fig. 2. Algorithm process

Fig. 3. Shell and tube heat exchanger

Fig. 4. Main coupling module of the code

Fig. 5. XADS core structure and calculation model

Fig. 6. Steady-state axial temperature distribution of core

Fig. 7. Steady-state temperature distribution of fuel profile

Fig. 8. Normalized power

Fig. 9. Average pin fuel temperature at fuel zone midplane and outlet coolant temperature

Fig. 10. Hottest pin fuel centerline temperature at fuel zone midplane and outlet coolant temperature