Title Branduolių sintezės įrenginiuose vykstančių neutronų pernešimo ir radiacinių procesų tyrimas /
Translation of Title Investigation of neutron transport and radioactive processes in nuclear fusion devices.
Authors Tidikas, Andrius
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Pages 40
Keywords [eng] nuclear fusion ; neutronics ; material activation ; particle transport
Abstract [eng] Increasing demand for sustainable energy sources with low carbon emissions drives the research interest in nuclear fusion. During the operation of nuclear fusion devices, structural and functional materials are exposed to tangible neutron irradiation. Neutron interactions with matter result not only in heat transfer but also in a significant material activation which leads to the production of radioactive nuclides. These radionuclides are the source of ionizing radiation and decay heat affecting nuclear fusion device operation, decommissioning and waste management. In this work neutron transport and material activation calculations were employed in order to assess the production of radionuclides in nuclear fusion devices suitable for electricity production. Investigation of material activation was performed by combining calculation results for three nuclear fusion relevant research devices: Joint European Torus, Fusion Materials Irradiation Facility - Demo Oriented Neutron Source and Demonstration Power Station. Differences and dependencies in activities, dose rates and decay heats due to different fusion reactions, irradiation scenarios, material compositions, volumetric vacuum vessel and fusion power changes were obtained with application of extended material activation calculation methodology. A novel sensitivity analysis based method was also suggested for neutron spectra evaluation. It is expected that this conducted research will result in betterment of nuclear fusion experimental and technological development.
Dissertation Institution Lietuvos energetikos institutas.
Type Summaries of doctoral thesis
Language Lithuanian
Publication date 2020