The aim of this work is to demonstrate a quantification method for chromium in molten fluorides salts. The focus is on the quantification of chromium which is a corrosion product of stainless steel alloys in molten salts. Elemental composition of FLiNaK is performed in this study by acid digestion followed by inductively coupled plasma optical emission spectroscopy (ICP-OES). FLiNaK samples are doped with varying concentrations, between 100ppm and 1000ppm, of chromium fluoride, CrF2 and CrF3 . The effect in the digestion and analysis of chromium when there is a difference in oxidation state of chromium will be noted. The samples are melted in order to have an homogenous mixture, frozen and then digested using the CEM Discover Microwave Digester in a combination of acids. The samples are analyzed by ICP-OES and the chromium concentration measured by the instrument is compared to the known amount added.

Quantification of molten salt composition for molten salt advanced nuclear reactors

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ACS Fall 2022

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