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Transient interactions of boron carbide with molten uranium oxide
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SYSNO ASEP 0547884 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Transient interactions of boron carbide with molten uranium oxide Author(s) Journeau, C. (FR)
Kiselová, M. (CZ)
Pozniak, I. (CZ)
Bezdička, Petr (UACH-T) SAI, RID, ORCID
Svora, Petr (UACH-T) SAI
Šubrt, Jan (UACH-T) SAI, RID
Bechta, S. (SE)Number of authors 7 Article number 101078 Source Title Nuclear Materials and Energy. - : Elsevier
Roč. 29, DEC (2021)Number of pages 11 s. Language eng - English Country NL - Netherlands Keywords Severe Accident ; Sodium-cooled Fast Reactor (SFR) ; Uranium dioxide ; Boron carbide ; Molten pool ; Aerosol release Subject RIV CA - Inorganic Chemistry OECD category Inorganic and nuclear chemistry Method of publishing Open access Institutional support UACH-T - RVO:61388980 UT WOS 000711373000003 EID SCOPUS 85123033700 DOI 10.1016/j.nme.2021.101078 Annotation Thermodynamic equilibrium calculations have shown that, at the elevated temperatures anticipated during se-vere accidents, uranium oxide-boron carbide interactions are likely to result in significant boron volatilization and the formation of uranium borides. This interaction is further investigated through transient experiments whereby boron carbide pellets are submerged in uranium dioxide melts held at elevated temperatures beneath inert atmospheres. X-ray diffraction and electron-microscopy analyses revealed the aerosols generated by the interaction to be rich in boron sesquioxide (B2O3) and uranium oxide. The solidified melt ingots recovered post-test exhibited highly heterogeneous chemistry with some samples richer in UO2 and others richer in U3O8. Thermodynamic equilibrium calculations indicate that this could be explained by heterogeneity in redox envi-ronment. The second, larger-scale, interaction, with an increased boron inventory, indicated uranium oxideboron carbide reaction formed either uranium boride or uranium borocarbide. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2022 Electronic address http://hdl.handle.net/11104/0324050
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