Fig. 1. Layout of long-lifetime gas-cooled core

Fig. 2. k_eff as a function of burnup for long-lifetime core with different monolithic burnable poison nuclides

Fig. 3. k_eff as a function of burnup for long-lifetime core with different contents of B₄C

Fig. 4. k_eff as a function of burnup for long-lifetime core with inhomogeneous distribution of B₄C

Fig. 5. Power distribution of long-lifetime core for zero-power

Fig. 6. Layout of B₄C rod

Fig. 7. k_eff as a function of burnup for long-lifetime core with different contents of B₄C rod

Fig. 8. k_eff as a function of burnup for long-lifetime core with different diameter of B₄C rod

Fig. 9. k_eff as a function of burnup (a) and power distribution at zero-power (b) for long-lifetime core with inhomogeneous content distribution of B₄C rod

Fig. 10. Layout of short-lifetime gas-cooled core

Fig. 11. k_eff as a function of burnup for short-lifetime core with different B₄C layouts

Fig. 12. k_eff as a function of burnup for short-lifetime core when B₄C in core graphite

Fig. 13. Layout of Gd₂O₃ rod (a) and k_eff as a function of burnup (b) for short-lifetime core

Fig. 14. Layouts of longer-lifetime gas-cooled core

Fig. 15. k_eff as a function of burnup for longer-lifetime core with Gd₂O₃ rod