Assessment of low activation materials

Characteristics of neutron-induced radioactivities for low-activation materials in a deuterium-tritium fusion power reactor were investigated. The criteria for the assessment of low-activation materials were reviewed. Candidate structural materials, namely, vanadium alloy (V5Cr5Ti), ferritic steel (modified HT9), and SiC composite material, and tungsten divertor material were considered in the evaluation. The assessment of these candidate materials for fusion reactor applications was made based on the issues of waste disposal, maintenance, afterheat, accidental dose release, and materials recycling. The significance of impurity elements and their levels was addressed using the recently updated activation cross sections