Experimental Investigation of Tellurium Corrosion of Nickel-Molybdenum Alloys in Molten Lithium-, Beryllium-, and Uranium-Fluoride Salts

Abstract

The test results on the compatibility of special nickel-molybdenum alloys with a fuel salt with the composition 71LiF–27BeF₂–2UF₄, containing tellurium additive, at temperature 760–800°C and controlled values of the redox potential, determined by the ratio [U(IV)]/[U(III)] = 30, 60, and 90, are colligated. A comparison of corrosion tests of the alloys with fuel salt with the chosen composition confi rmed the threshold character of the dependence of the intercrystallite corrosion intensity on the ratio [U(IV)]/[U(III)] and melt temperature. The domestic alloy KhN80MTYu is recommended for further study as the main structural material of the reactor loop of a molten salt reactor with the maximum temperature of the fuel salt 750–800°C.