Effects of simultaneous transfer of heat and tritium through Li–Pb or Flibe blanket

Abstract

a b s t r a c tTransport of tritium (T) and heat is calculated to estimate the performance of liquid Li 17 Pb 83 (Li-Pb) or Li 2 BeF 4 (Flibe) as a T-breeder in a fusion reactor blanket. T is bred in such a way of low leak to facilities outside and continuous recovery by a removal system, and heat is transferred through structural walls to He coolant efficiently. In this paper, T permeation in a blanket composed of structural materials and liquid Li-Pb or Flibe is calculated based on data of previous experiment. The effects of T recovery ratio by the outside removal apparatus and fluid-film T diffusion resistance in the liquid blanket on overall T permeation rates are analytically clarified. Design of a liquid blanket with low T leak and high T recovery is discussed here. In addition, possibility in that microbubbles may be generated at interfaces between a liquid blanket and a structural wall is investigated.

Analysis of Simultaneous H and D Permeation through Lithium-Lead

“…Although its order is in agreement among other solubility data, its temperature dependence shows different trend. The same trend was reported by the recent research [2]. There is possibility in that the conditions of Li 17 Pb 83 were different from run to run.…”

“…When the output of a fusion reactor is 1 GW and authorized T leak to the environment is 1 g/year ( 10 Ci/day), it is necessary that the ratio of recovery to production of T is more than 99% [2]. For realizing high T recovery from a Li 17 Pb 83 blanket loop and controlling to low T leak from a system, mass-transfer data of diffusivity and solubility of hydrogen isotopes in Li 17 Pb 83 are indispensable.…”

“…However, there is some scattering among the solubility data determined by a constant volume method. We also have experimentally determined mass-transfer properties of single component of H 2 or D 2 in Li 17 Pb 83 by an unsteady permeation method [1,2]. When recovering T from a blanket, isotopic exchange reaction is effective to author's e-mail: m.okada@aees.kyushu-u.ac.jp * ) This article is based on the presentation at the 21st International Toki Conference (ITC21).…”

Analysis of diffusion and dissolution of two-component hydrogen (H+D) in lead lithium

“…Without Li 17 Pb 83 layer, the permeation rate of H or D through ␣-Fe is 10 3 times faster than that through Pb-Li. Therefore, the permeation resistance of H and D through ␣-Fe is considered to be negligibly small compared to that through Li 17 Pb 83 [11]. The permeation flux of hydrogen isotopes, J k,0 (mol/m 2 s), in the one-dimensional direction for the one-component and also two-component syetems is described by the following equation:…”