Impact of fusion reactor neutronics modeling for transmutation and thermal feedback

Abstract Fusion neutronics calculations provide important metrics pertinent to fusion reactor operations, such as tritium breeding ratios and data on heat deposition, material activation, damage. Because of the high computational burden required generate a high-fidelity Monte Carlo simulation 3D reactor, various assumptions are made reduce time by simplifying model or calculation iteration. This paper explores impact ratio decay structural materials based composition in temperature modeling materials. Results show that for compact tokamaks with power long operational cycles, transmutation is significant enough cause substantial change flux spectrum decrease (TBR) 3.63% after 2 years full operation. Additionally, assuming constant density can TBR up 3%.