期刊论文详细信息
JOURNAL OF NUCLEAR MATERIALS 卷:520
Thermal analysis of projected molten salt compositions during FFTF and EBR-II used nuclear fuel processing
Article
Karlsson, Toni Y.1  Fredrickson, Guy L.1  Yoo, Tae-Sic1  Vaden, DeeEarl1  Patterson, Michael N.2  Utgikar, Vivek3 
[1] Idaho Natl Lab, Pyrochem & Molten Salt Syst Dept, POB 1625, Idaho Falls, ID 83415 USA
[2] Idaho Natl Lab, Mat & Fuels Complex Prod Facil, Idaho Falls, ID 83415 USA
[3] Univ Idaho, Dept Chem & Mat Engn, Moscow, ID 83843 USA
关键词: Electrorefining;    Electrorefiner;    Eutectic;    LiCl-KCl;    Molten salt;    Nuclear fuel;    Uranium;    Liquidus;   
DOI  :  10.1016/j.jnucmat.2019.04.016
来源: Elsevier
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【 摘 要 】

This work examines the change in liquidus temperature of the salt used in the Mk-IV electrorefiner at the Idaho National Laboratory during processing campaigns of sodium-bonded driver fuels from Experimental Breeder Reactor II and the Fast Flux Test Facility reactor. Modeling and Simulation Tool for Electrochemical Recycling Systems (MASTERS), an INL proprietary pyroprocessing flowsheet simulation tool, was used to simulate the processing campaigns and determine the resulting composition changes of the Mark-IV electrorefiner salt. Surrogate salt samples simulating the Mk-IV electrorefiner salt during the fuel processing campaigns were prepared, and the thermal properties were measured via differential scanning calorimetry. Results from this study indicate that after processing approximately 2,150 kg of uranium metal from used fuel, the liquidus temperature of the molten salt exceeds 520 degrees C, which is a significant increase from 352 degrees C (the melting temperature of eutectic LiCl-KCl). It was also found that the liquidus temperature is strongly dependent on the amount of NaCl accumulating in the Mk-IV electrorefiner salt. Thus, the assessment of the liquidus temperature during the subsequent fuel processing campaigns can be simplified by considering the ternary LiCl-KCl-NaCl system only. (C) 2019 Elsevier B.V. All rights reserved.

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