Activation analysis for the LIBRA light ion beam fusion conceptual design

Activation calculations have been performed for the LIBRA reactor. Replacing HT-9 with low-activation modified HT-9 increases the activity by a factor of 2.5 at shutdown while the long-term activity drops by a factor of 25. The reflector is classified as Class-C low-level waste when modified HT-9 is used. Using HT-9 will require deep geological burial for the LIBRA radiation waste. The activity produced in the Li ₁₇Pb₈₃ coolant has been determined. The major contributor to the coolant biological hazard potential (BHP) between a week and a year after shutdown is ²¹⁰Po. During this period, the ²¹⁰Po BHP values change from 7×10⁵ to 1.2×10⁵ km³ of air