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 ›› 2019, Vol. 30 ›› Issue (6): 102 doi: 10.1007/s41365-019-0620-4


The protective performance of a molten salt frozen-wall in the process of fluoride volatility of uranium

Jin-Hao Zhou1,2 • Ji-Lin Tan2 • Bo Sun2 • Qiang Dou2 • Qing-Nuan Li2   

  1. 1 University of Chinese Academy of Sciences, Beijing 100049, China
    2 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2018-10-10 Revised:2019-01-11 Accepted:2019-01-22
  • Contact: Qiang Dou
  • Supported by:
    This work was supported by the Strategic Priority Research Program of the Chinese Academy of Science (No. XDA02030000).
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Jin-Hao Zhou, Ji-Lin Tan, Bo Sun, Qiang Dou, Qing-Nuan Li. The protective performance of a molten salt frozen-wall in the process of fluoride volatility of uranium.Nuclear Science and Techniques, 2019, 30(6): 102     doi: 10.1007/s41365-019-0620-4

Abstract: The fluoride volatility method (FVM) is a technique tailored to separate uranium from fuel salt of molten salt reactors. A key challenge in R&D of the FVM is corrosion due to the presence of molten salt and corrosive gases at high temperature. In this work, a frozen-wall technique was proposed to produce a physical barrier between construction materials and corrosive reactants. The protective performance of the frozen wall against molten salt was assessed using FLiNaK molten salt with introduced fluorine gas, which was regarded as a simulation of the FVM process. SS304, SS316L, Inconel 600 and graphite were chosen as the test samples. The extent of corrosion was characterized by an analysis of weight loss and scanning electron microscope studies. All four test samples suffered severe corrosion in the molten salt phase with the corrosion resistance as: Inconel 600 > SS316L > graphite > SS304. The presence of the frozen wall could protect materials against corrosion by molten salt and corrosive gases, and compared with materials exposed to molten salt, the corrosion rates of materials protected by the frozen wall were decreased by at least one order of magnitude.

Key words: Molten salt reactors, Fluoride volatility method, Corrosion, Frozen wall, Protective performance