Burnup dynamics and reactivity change in proton induced Tc-99 transmutation fuel assembly
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Neutron transmutation presents a viable method for the management and disposal of long-lived fission products. A newly published method describes a transmutation system that utilizes proton spallation in conjunction with a subcritical fuel assembly. This innovative approach has demonstrated the ability to reduce the transmutation half-life of technetium-99 (Tc-99) to less than one year. This study investigates the impact of Tc-99 concentrations on the subcriticality of the transmutation device during burnup using the Serpent 2 Monte Carlo neutron transport code. The burnup simulation demonstrates that (1) The number densities of U-235 and Tc-99 decrease steadily across all cases as burnup extends up to 600 days, (2) keff decreases steadily and remains below 1.0 after 600 days of burnup. Specifically, keff is below 0.7 in UO2 fuels and below 0.1 in UF4 fuels after 600 days. These findings provide valuable insights into optimizing and ensuring the safety of the transmutation device
Abstract
Neutron transmutation presents a viable method for the management and disposal of long-lived fission products. A newly published method describes a transmutation system that utilizes proton spallation in conjunction with a subcritical fuel assembly. This innovative approach has demonstrated the ability to reduce the transmutation half-life of technetium-99 (Tc-99) to less than one year. This study investigates the impact of Tc-99 concentrations on the subcriticality of the transmutation device during burnup using the Serpent 2 Monte Carlo neutron transport code. The burnup simulation demonstrates that (1) The number densities of U-235 and Tc-99 decrease steadily across all cases as burnup extends up to 600 days, (2) keff decreases steadily and remains below 1.0 after 600 days of burnup. Specifically, keff is below 0.7 in UO2 fuels and below 0.1 in UF4 fuels after 600 days. These findings provide valuable insights into optimizing and ensuring the safety of the transmutation device