Design studies of innovatively small fusion reactor based on biomass-fusion hybrid concept: GNOME

Effects of lithium burn-up on TBR in DEMO reactor SlimCS

“…The burn-up of 6 Li is 8-79% after 10-year operation. TBR6 s decrease in some layers, while they increase in some layers.…”

“…TBR6(0, r) and TBR7(0, r), which are initial TBRs due to 6 Li and 7 Li, respectively, using initial atomic densities. (2) Calculation of the consumed atomic densities of 6 Li and 7 Li after K-year operation by the following equations;…”

“…DEMO reactors require the net tritium breeding ratio (TBR) of more than 1.05-1.1 [1,2] and a lot of design studies have been conducted to meet the requirement [1][2][3][4][5][6]. SlimCS is a conceptual design of a tokamak DEMO reactor being developed by JAEA [4].…”

“…Be pebble, Be 12 Ti pebble and Be plate are applied as beryllium. 6 Li isotope is enriched to 90% in the Li 4 SiO 4 pebbles. In this design, the net TBR of more than 1.05 can be achieved [5].…”

“…Consequently, the tritium production might be changed by decrease of the atomic densities and the change of the neutron spectra due to the lithium burn-up. Numerous studies have been reported on the evaluation of TBR [1][2][3][4][5][6][7]. El-Guebaly et al reported the impact of tritium burn-up fraction on tritium start-up inventory [2].…”