Thermodynamic behavior of CrF2 corrosion product in the molten LiF-ThF4 salt system

Journal article (2024)

Authors

T. Dumaire European Commission Joint Research Centre, RST/Reactor Physics and Nuclear Materials - AS
O. Walter European Commission Joint Research Centre
O. Beneš European Commission Joint Research Centre
Jean-Christophe Griveau European Commission Joint Research Centre
Eric Colineau European Commission Joint Research Centre
R. Konings RST/Reactor Physics and Nuclear Materials - AS , European Commission Joint Research Centre
A.L. Smith RST/Reactor Physics and Nuclear Materials - AS
Research Group
RST/Reactor Physics and Nuclear Materials (AS) (TU Delft)
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Published Date

2024

Language

English

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Reactor Physics and Nuclear Materials

Abstract

This work examines the thermochemistry of the chromium difluoride CrF2 corrosion product in the molten [Formula presented] fuel salt system. Through a combination of experimental investigations and thermodynamic modeling assessment, the study elucidates the thermodynamic properties, phase diagram equilibria, and overall thermodynamic behavior of CrF2 corrosion product, following dissolution from a structural material to the molten salt fuel environment. In this work, two different synthesis methods were developed for pure CrF2, further allowing to experimentally measure the phase equilibria in the [Formula presented], [Formula presented], and [Formula presented] systems. Then, thermodynamic models were developed using the CALPHAD method based on the quasichemical model in the quadruplet approximation.