ACTIVATION-ANALYSIS AND MATERIALS CHOICE IN THE LASER FUSION-REACTOR KOYO

The laser fusion conceptual reactor KOYO, developed by the ILE Osaka, is presented and analyzed from the activation perspective. The reactor is driven by a laser diode pumped solid state laser which dramaticall y increases the efficiency of the system, and uses liquid LiPb film pr otection flowing through ceramic SiC porous tubes in the blanket. Neut ron fluxes have been computed using 2/3D models and compared with sphe rical approaches. Two blanket areas with different packing fractions a re considered, and we show the availability of a large fraction of the SiC with impurities to be considered as shallow land burial (SLB). We propose a more complete solution for SLB through the use of porous wo ven graphite (C) fabric tubes. A graphite reflector is included with i mportant effect in the activation of the chamber wall. Ferritic HT-9 i s considered as the structural material for the chamber wall, allowing its SLB and different recycling options. Releases of 1 kg of target-e missions-facing SiC tubes and HT-9 materials have also been simulated with optimum performances.