Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2014, Vol. 25 ›› Issue (4): 040602 doi: 10.13538/j.1001-8042/nst.25.040602

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Apparatus for determining permeability of hydrogen isotopes in molten-salt

ZENG You-Shi, WU Sheng-Wei, QIAN Yuan, WANG Guang-Hua, DU Lin, LIU Wei, XIA Zheng-Hai   

  1. 1University of Chinese Academy of Sciences, Beijing 100049, China
    2Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    3CNNC Nuclear Power Operations Management Co., Ltd., Haiyan 314300, China
  • Contact: LIU Wei, XIA Zheng-Hai E-mail:liuwei@sinap.ac.cn; xiazh@cnnp.com.cn
ZENG You-Shi, WU Sheng-Wei, QIAN Yuan, WANG Guang-Hua, DU Lin, LIU Wei, XIA Zheng-Hai. Apparatus for determining permeability of hydrogen isotopes in molten-salt.Nuclear Science and Techniques, 2014, 25(4): 040602     doi: 10.13538/j.1001-8042/nst.25.040602

Abstract:

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 at 300–700 °C. 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 DFlinak-H = 7.06 ×10-5 e-54.9/(RgT) m2/s and SFlinak-H = 1.67 ×10-7e27.0/(RgT) mol-H2/(m3 Pa).

Key words: Molten-salt, Permeability, Diffusivity, Solubility, Hydrogen isotope