The impact of materials composition and irradiation modeling on the activation of ITER in-vessel components

This paper presents the results of sensitivity studies aiming to assess the impact of the AISI 316 ITER structural material composition on the activation characteristics of the in-vessel components. The influence of the protective layer material, namely beryllium, carbon fibre composite, and tungsten, is also analyzed and discussed. Three neutron fluence values are considered: 0.3, 1, and 3 MW y/m2, and the related impact on activation results in discussed. The ANITA-2 and the FISPACT-3 activation codes are used, with updated cross sections and decay data libraries based on EAF-3 evaluation files. The 1D-Sn XSDRNPM-S transport code, using the 171 group Vitamin C library based on EFF-2 data, is used to produce the flux-weighted spectrum needed for the activation calculations. The outline design of ITER defined in the fourth meeting of the Technology Advisory Committee is considered for the assessment.