Apparatus for determining permeability of hydrogen isotopes in molten-salt  

作　　者：曾友石 吴胜伟 钱渊 王广华 杜林 刘卫 夏正海 

机构地区：[1]University of Chinese Academy of Sciences [2]Key Laboratory of Nuclear Radiation and Nuclear Energy Technology,Shanghai Institute of Applied Physics,Chinese Academy of Sciences [3]CNNC Nuclear Power Operations Management Co.Ltd.

出　　处：《Nuclear Science and Techniques》2014年第4期73-78,共6页核技术（英文）

摘　　要：In order to provide data on diffusion coefficients and solubility constants of tritium in molten salts for the critical issue of tritium control in the Thorium Molten Salt Reactor(TMSR)program,a two-chamber permeability apparatus separated by a nickel plate had been developed for determining the permeability of hydrogen isotope in molten salts.Descriptions on the permeability apparatus,experimental procedure and the analytical method for determining the diffusivity and solubility of hydrogen isotope in molten salts were presented in this paper.To assess the performance of the apparatus,the blank tests without molten salt were conducted at300-700℃.The results showed that the nickel plate acting as the window for hydrogen isotope permeation in the apparatus seemed to have less effect on experiments of determining the permeability of hydrogen isotope in molten slat at 500-700℃.Furthermore,the applicability of the apparatus with molten salt was also evaluated experimentally,with test experiments of molten Flinak(LiF-NaF-KF)at 500℃,600℃and 700℃.Diffusion coefficients and solubility constants of hydrogen in molten Flinak can be derived from those test experiments,which were correlated to D_(Flinak-H)=7.06×10^(-5)e^(-54.9/(R_gT))m^2/s and s_(Flinak-H)=1.67×10^(-7)e^(27.0/(r_gt))mol-H_2/(m^3 Pa).In order to provide data on diffusion coefficients and solubility constants of tritium in molten salts for the critical issue of tritium control in the Thorium Molten Salt Reactor（TMSR） program,a two-chamber permeability apparatus separated by a nickel plate had been developed for determining the permeability of hydrogen isotope in molten salts.Descriptions on the permeability apparatus,experimental procedure and the analytical method for determining the diffusivity and solubility of hydrogen isotope in molten salts were presented in this paper.To assess the performance of the apparatus,the blank tests without molten salt were conducted at300-700 ℃.The results showed that the nickel plate acting as the window for hydrogen isotope permeation in the apparatus seemed to have less effect on experiments of determining the permeability of hydrogen isotope in molten slat at 500-700 °C.Furthermore,the applicability of the apparatus with molten salt was also evaluated experimentally,with test experiments of molten Flinak（LiF-NaF-KF） at 500 °C,600 °C and 700 °C.Diffusion coefficients and solubility constants of hydrogen in molten Flinak can be derived from those test experiments,which were correlated to D_（Flinak-H）= 7.06 ×10^-5e^-54.9/（RgT）） m^2/s and SFlinak-H= 1.67 ×10^-7e^27.0/（RgT））mol-H2/（m^3 Pa）.

关 键 词：氢同位素 熔融盐 渗透性 装置 实验程序 空白试验 溶解度 熔盐堆 

分 类 号：TL426[核科学技术—核技术及应用]