Speaker
Description
This study introduces a novel Helium Cooled Pebble Bed (HCPB) Breeding Blanket (BB) design tailored for the DEMO Low Aspect Ratio (LAR) reactor. Despite the stringent constraints imposed by reduced fusion power and compact tokamak dimensions, the proposed design maintains the conventional pin-type architecture while achieving a sufficient Tritium Breeding Ratio (TBR) and superior internal shielding performance. Crucially, this configuration significantly mitigates the shielding deficit typically associated with helium-cooled systems compared to water-cooled counterparts, while simultaneously addressing the fabrication challenges related to welding in traditional pin structures. Structural modifications within the Breeder Zone (BZ) have notably revitalized the effectiveness of shielding blocks in the Back Supporting Structure (BSS) a component that previously offered negligible benefits. Consequently, the enhanced radiative shielding capability of the new HCPB design ensures substantial safety margins for the Vacuum Vessel (VV) and Toroidal Field Coil (TFC), thereby satisfying rigorous design safety factors. Finally, to further refine the design, neutronics simulations were conducted with various candidate shielding materials applied to the BSS shielding block, identifying the optimized material composition and design parameters.
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