Impact of Material Configuration Behind First Wall on Helium Formation in In-Vessel Components of Fusion Reactor

概要

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The results of neutron transport calculations of the He formation based on the JENDL gas-production cross section file are discussed for some metals and alloys, namely 27Al, Ti, 51V, Cr, 55Mn, Fe, Ni, Zr, Mo, austenitic stainless steel (Ti modified 316 SS : PCA), Ni-base alloy (Inconel 625), ferritic steel (Fe-11Cr-1Mo : HT-9), Ti-base alloy (Ti-6AI-4V) and V-base alloy (V-5Cr-5Ti). Impacts of the two shields having the steel-rich and the H2O-rich compositions and the two blankets having the Li2O/Be-base and the liquid Li/Be-base compositions on the He formation rate in the above-mentioned metals and alloys are discussed. The relation between the He formation rate and the fast neutron flux (14.1 MeV>E>0.1 MeV) is investigated. The decrease of He formation at any distance Δ from the first wall more than Δas, the distance where the shape of neutron spectrum reaches its asymptotic form, is modelled by the simple formula based on the exponential dependence, as those reported so far for the fast neutron flux and the displacement damage rate.