Fig. 1. Schematic diagram of single fuel pin channel^[8]

Fig. 2. Computational model for MPC-LBE code^[10]

Fig. 3. Axial temperature distribution of relevant materials in the steady-state object channel

Fig. 4. Power and reactivity of object channel change with time under the double BOP accident

Fig. 5. Temperatures change of relevant materials in object channel with time under the double BOP accident

Fig. 6. Negative feedback change of reactivity under the double BOP accident

Fig. 7. Power and reactivity change in object channel with time under the triple BOP accident

Fig. 8. Temperature changes of relevant materials in object channel under the triple BOP accident

Fig. 9. Negative feedback change of reactivity under the triple BOP accident

Fig. 10. Highest temperature of relevant materials in object channel at different BOP