LAUSR

Abstract ITER will be the largest Tokamak in the world, and it is expected to produce a total of up to 2.8•1027 neutrons during its operation. The Tokamak infrastructure will become radioactive as the machine operates, which is an aspect that needs to be considered in the design of the planed in-situ maintenance activities. The occupational radiation exposure (ORE) must be accounted for, and an ALARA program must be implemented to minimize it. It requires the determination and analysis of shutdown dose rates fields, the purpose of D1SUNED tool. Common to all Direct one-step-based approaches, this tool needs to be fed with a nuclear data set tailored for each problem and produced ex professo. In this paper, we characterize the radioactive inventory relevant for the ORE of ITER maintenance activities using ACAB activation code. The ITER reference irradiation scenario SA-2 and the cooling times of interest 105 s and 106 s are considered. A comprehensive list of typical materials has been studied with detailed impurities content. The nuclear data set covers 99% of the radioactive inventory of concern, and all the pathways responsible for 99% of its production. It has been prepared following the ITER recommendations of cross-sections libraries and it has been verified against Rigorous-two steps calculations. This batch of nuclear data complements D1SUNED for shutdown dose rate exhaustive analysis for ITER with the perspective of maintenance according to the latest ITER nuclear data standards.