Design space and architecture study of Tokamak-based Hybrid Fusion-Fission Power Plants

Fusion-Fission power plants are explored using PROCESS (tokamak systems code) and openmc/Paramak (neutronics simulation code), to determine the trends and achievable design points in a design space of D-T Tokamaks with fissionable material used in the Breeder Blanket. This includes trends effecting plasma configuration and In-Vessel Component design when a plant is optimised for different Breeder Blanket energy multiplication values and a given electrical generating capacity. Due to the additional power produced from fission in a Hybrid Breeder Blanket, lower fusion power can be accepted fora given electrical power output (< 100MW(t) fusion power for a plant at 200MW(e)), which has notable knock-on effects to lower fusion gain (similar to 0.6), and lower power plasma exhaust (estimated Q ''(div) approximate to 3.74MW/m(2)). In this design space, Hybrid Breeder Blankets are used to enable energy multiplication (from fission) and increased tritium production, with TBR values greatly exceeding conventional Fusion Power Plant concepts (TBR > 5 for enriched Lithium, or TBR > 2 with unenriched Lithium).