The potentiality of TRU fuel as dual cooled annular fuel rods with different types of burnable absorbers- IBAs, BPRs, coated absorbers, etc. in the hexagonal assembly of VVER-1000 was studied. Annular 7, Annular 8, and Annular 9 models were taken for various combinations of TRU fuel and burnable absorbers. Planned models were simulated in Monte Carlo particle simulation code OpenMC and lattice physics deterministic code Dragon Version5. Burnup-dependent multiplication factors were simulated for 3000 EFPDs. Reactivity was calculated by taking 3% neutron leakage. The study showed that both the multiplication factor and reactivity for TRU fuel are significantly higher than conventional UO2 fuel. LRM (Linear Reactivity Model) was applied to find out cycle burnup, discharge cycle burnup, and cycle length. High cycle burnup, discharge burnup, and cycle length have been observed for TRU fuel compared to UO2 fuel. Burnup-dependent atomic concentration graphs showed that slight burn of Np-237, constant concentration for Cm-244, a slight increase for Am-242, and linear burnout of burnable absorbers- Gd-155, Gd-155, and Er-167. A lower concentration of Xe-135 has been observed for TRU fuel. Pin power distribution and energy-dependent neutron flux for different models and BA combinations are also included in this study.

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