ACTIVATION EXPERIMENTS AT TFTR IN DEUTERIUM-TRITIUM NEUTRON FIELD

Samples of materials, of relevance to ITER and DEMO reactors, have bee n irradiated at TFTR in a mixed D-T and D-D neutron field over the pas t 3 years. The samples have been placed at various locations close to, and around, the TFTR vacuum vessel to obtain the impact of the variat ion of neutron energy spectrum on induced radioactivity. Intermediate measurements of decay gamma-ray activity of a number of radiated sampl es have contributed to an experimental database of saturation activiti es for aluminum, silicon, titanium, vanadium, chromium, manganese, iro n, cobalt, nickel, copper, zinc, zirconium, niobium, molybdenum, indiu m, silver, europium, terbium, hafnium, tungsten, rhenium, gold, 316 st ainless steel, a vanadium-chromium-titanium alloy, a manganese-copper alloy, inconel 625, and inconel 718. New activity data for samples irr adiated in TFTR irradiation-end 3 (external) are presented. Data for V -9Cr-5Ti alloy, inconel 718 alloy, and inconel 625 alloy are being rep orted for the first time. These measurements offer an invaluable oppor tunity for bench-marking of three-dimensional calculations of fusion n eutron transport and activation for application to the design and regu latory licensing of large complex fusion reactors, such as ITER. (C) 1 998 Elsevier Science S.A. All rights reserved.