| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
Optimization of the Phase Equilibria and Thermodynamics for Rare-earth Fluoride Systems Relevant to Molten Salt Reactors |
| Author(s) |
Kaitlin E. Johnson, Juliano Schorne Pinto, Theodore M. Besmann |
| On-Site Speaker (Planned) |
Kaitlin E. Johnson |
| Abstract Scope |
Accurate thermodynamic models are necessary for advancement and licensing of molten salt reactor designs. In the investigation of the impact of fission products on fuel phase behavior, the Nd-Li-F, Nd-Na-F, Nd-U-F, and Ce-U-F systems have been evaluated and optimized for inclusion in the database. Historical phase change data and thermochemical values were used to assess the NdF3-LiF and NdF3-NaF pseudo-binary phase diagrams using the modified quasichemical model to describe the behavior of the melt. In the absence of existing experimental data, initial phase diagrams of the CeF3-UF4 and NdF3-UF4 were based on analogous systems and differential scanning calorimetry was used to determine phase change behavior to allow optimization of the developed thermodynamic models. Approximations of associated higher order systems were then developed based on the pseudo-binary systems. |
| Proceedings Inclusion? |
Planned: |