Development of a Thermodynamic Database for Corrosion in Chloride MSRs

Conference · Tue Oct 11 04:00:00 EDT 2022

OSTI ID:1894592

Yingling, Jacob Allen ^[1]; Ard, Johnathon ^[2]; , Juliano ^[3]; , Mina ^[4]; , Amir ^[5]; , Theodore ^[6]

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1. Idaho National Laboratory
2. Ard
3. Schorne-Pinto
4. Aziziha
5. Mofrad
6. Besmann

Control of the salt redox condition is the salient method for corrosion inhibition in molten salts. For chloride salt-fueled molten salt reactors of primary concern is the U(IV)/U(III) ratio, influenced directly by the Cl2 activity in the salt. Although thermodynamic assessments of MSR-relevant salts abound, none have included consideration of UCl4 which is essential to correctly describe the salt redox condition. This work reports the assessment of the NaCl-KCl-MgCl2 base salt with UCl3-UCl4 and corrosion chlorides involving Cr, Fe, and Ni as minor components and the resultant thermodynamic models. The effort utilized available thermodynamic measurements and phase equilibria complemented by differential scanning calorimetry determinations of phase equilibria. Example calculations explore the temperature and composition space to understand its influence on corrosion. The foregoing models are incorporated into an update of the Molten Salt Thermal Properties Database – Thermochemical which is publicly available.

• Research Organization: Idaho National Laboratory (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE)
• DOE Contract Number: AC07-05ID14517
• OSTI ID: 1894592
• Report Number(s): INL/CON-22-69557-Rev000
• Country of Publication: United States
• Language: English

Related Subjects

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
MSR
calphad
corrosion