Synthesis and thermophysical property determination of NaCl-PuCl3 salts

Karlsson, Toni Y.; Middlemas, Scott C.; Nguyen, Manh-Thuong; Woods, Michael E.; Tolman, Kevin R.; Glezakou, Vassiliki-Alexandra; Herrmann, Steven D.; Schorne-Pinto, Juliano; Johnson, Ryan D.; Reddish, Shawn E.; Warmann, Stephen A.; Paviet, Patricia D.

doi:10.1016/j.molliq.2023.122636

Synthesis and thermophysical property determination of NaCl-PuCl3 salts

Journal Article · Sun Oct 01 04:00:00 EDT 2023 · Journal of Molecular Liquids

DOI:https://doi.org/10.1016/j.molliq.2023.122636· OSTI ID:2006830

Karlsson, Toni Y.; Middlemas, Scott C.; Nguyen, Manh-Thuong; ; Tolman, Kevin R.; Glezakou, Vassiliki-Alexandra; Herrmann, Steven D.; Schorne-Pinto, Juliano; Johnson, Ryan D.; Reddish, Shawn E.; Warmann, Stephen A.;

Currently, a knowledge gap exists in the available data and understanding of thermophysical properties relating to fresh fuel salts, especially those containing plutonium. These data are necessary for designing, constructing, and licensing future commercial molten-salt reactors. Thermophysical properties, such as melting temperature, salt stability, density, and heat capacity were ascertained using NaCl-PuCl3 (36 mol% PuCl3) and a more sodium rich composition containing 25 mol% PuCl3. The NaCl-PuCl3 salt mixture was synthesized for this study and contained 63.4 mol% NaCl, 36.3 mol% PuCl3 and was 99.7% pure. Upon heating, the NaCl–PuCl3 eutectic was stable at temperatures up to 800 °C. The onset of melting occurred at 451 ± 3 °C, and the enthalpy of fusion was determined to be 23.0 ± 1.4 kJ/mol. Heat capacity measurements in the liquid phase ranged from 107.7 to 91.3 J/mol.K, with an average value of 104.6 ± 11.4 J/mol.K between 500 and 650 °C. Three independent trials of the molten NaCl-PuCl3 salt found the density to be ?(T) = 3.8589 – 9.5342·10-4 T(°C). In addition, ab initio molecular dynamic simulations to calculate density and heat capacity values are included.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 2006830

Alternate ID(s):: OSTI ID: 2032561

Report Number(s):: INL/JOU--22-70548-Rev000

Journal Information:: Journal of Molecular Liquids, Journal Name: Journal of Molecular Liquids Vol. 387; ISSN 0167-7322

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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