The Tritium balance in DEMO Reactor is a key factor for the successful of the production of energy from Thermonuclear Fusion Reactor. Three of the four Breeder Blankets (BB) concepts candidates for DEMO used the eutectic Pb–16Li enriched at 90% in 6Li as breeder, the WCLL (Water Cooled Lithium Lead), DCLL (Dual Coolant Lithium Lead) and HCLL (Helium Cooled Lithium Lead) BBs,...
The authors proposed a concept of tritium and heat simultaneous recovery from lithium-lead (PbLi) in vacuum in 2016. Hot and tritium rich liquid PbLi is transformed into small size droplets (atomization) through nozzles in a vacuum recovery chamber. While falling, tritium is released by advection mass transport and recovered by a vacuum pump. Heat is transferred by radiation to the...
The Permeation Against Vacuum (PAV) is the prevailing technology with regard to the tritium extraction from PbLi in the liquid metal-based breeder blankets. With the aim of achieving tritium self-sufficiency of the DEMO power plant, this technology allows the continuous operation mode in a relatively compact system by providing high extraction efficiency. A small scale prototype of PAV,...
Tritium release behavior from solid breeder pebbles in a blanket module is strongly influenced by not only diffusion in grains but also surface reactions. A part of tritium released to a purge gas permeates into a coolant. Nishikawa et al. proposed the tritium release model from solid breeder materials that includes tritium diffusion and surface reactions such as isotope exchange reaction,...
DEMO tritium self-sufficiency will be one of the remaining challenges after ITER before achieving commercial fusion energy. Though ITER has not been set the tritium self-sufficiency target, tritium self-sufficiency related fusion science and technology are the maximum attainable level right now.
In this study, the dynamic tritium cycle was simulated both for steady and...
The authors have suggested that realistic Power Ascension Tests (PAT) of DEMO can produce its tritium to be needed in the series of tests by its own operation from initial DD discharge until reaching steady state full power burning with no external supply. It is generally understandable that closed tritium fuel plant can collect small amount of tritium to be produced by DD and DT reaction and...
