NEUTRON ENVIRONMENT AND CONSEQUENCES ON THE DESIGN AND OPERATION OF THE LASER FUSION-REACTOR KOYO

The Inertial Fusion Reactor KOYO. proposed by ILE Osaka was completed in its first phase study in 1992, and recent updates including new fea tures have been released up to now. It is based on potentially I;ey ac hievements in Inertial Fusion Energy (IFE) physics: development to ach ieve required laser efficiency, implosion stability and gain, pellet f abrication, chamber maintenance, engineering feasibilities, and cost o f electricity. Neutron (target) emission profiles are reported assumin g direct drive compressed targets (500 g.cm(-3)), which have been desc ribed with different approaches in stationary transport models. A full three-dimensional description of the reactor has been used to perform the neutronic analysis. Neutron spectra and fluences are calculated, and compared with previous one-dimensional results showing the differe nces in using both approaches. Some figures indicating the neutron flu x expected through deep penetrations impinging on the final optics are also presented, representing its coincidence at long distances with t he uncollided flux. The reported consequences art: those related to th e activation of tile materials: shallow land burial (SLB) and recyclin g. Those radiological responses have been studied for the SIC tubes (c omponents of the blanket), graphite (reflector), anti ferritic steel H T-9 (structural wall).