Fig. 1. Basic unit of the core

Fig. 2. Design range of core size under P and T limits

Fig. 3. Core mass under different axial parameters

Fig. 4. Normalized radial power distribution of original design

Fig. 5. Layouts of BP in fuel rods

Fig. 6. Variation of radial power distribution upon three BP layouts

Fig. 7. Variation of burnup upon three BP layouts

Fig. 8. Optimal design scheme of the core

Fig. 9. Normalized power distribution at beginning of lifetime (BOL) and end of lifetime (EOL)

Fig. 10. Schematic illustration of sliding reflector segments

Fig. 11. Control scheme of single slider

Fig. 12. Reactivity swing for different layered sliders

Fig. 13. Power peak factor versus number of sliding segments fully withdrawn

Fig. 14. Integral worth of single slider under different closeness