ACTIVATION OF TZM AND STAINLESS-STEEL DIVERTOR MATERIALS IN THE NET FUSION MACHINE

This paper presents the results of the activation and decay heat calcu lations for the divertor plate materials of the Next European Torus (N ET). The basic option assessed enables molybdenum alloy TZM and AISI 3 16L as material for divertor cooling channels. Burn time, effective ir radiation time history, and fluence dependence on activation, decay he at, and contact dose is assessed. Impact of the material impurity leve l on the radioactive inventory is also investigated. The ANITA code is used, with updated cross sections and decay data libraries based on E FF-2 and EAF-3 evaluation files. The flux-weighted spectrum provided b y XSDRNPM or ANISN 1-D codes has been used. The real NET geometry was modelled with the 3-D MCNP Monte Carlo neutron transport code.