Abstract
Redox potential control is important in mitigating corrosion in molten salt reactors (MSRs) during operation. This study has developed a methodology for establishing the operational boundaries, both upper and lower, of the ratio of UF4 to UF3 (UF4/UF3) for redox potential control in U-bearing fluoride salts by measuring the equilibrium quotient. The upper limit for UF4/UF3 is determined by the potential for chromium dissolution, while the formation of uranium carbides governs the lower limit. By applying the methodology, the research experimentally determined the UF4/UF3 ratio in NaF-KF-UF4 salt at temperatures ranging from 873 K to 1023 K. To determine a stable operational range, the range of the operation temperature of the MSR must be considered, the stable range of the ratio is depicted as a trapezoid, with the upper and lower limits serving as the bases of the trapezoid.
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