Comparing the corrosion of uranium nitride and uranium dioxide surfaces with H2O2

Eleanor Lawrence Bright*, Sophie Rennie, Angus Siberry, Keivan Samani, Kasia Clarke, D. T. Goddard, Ross Springell

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

10 Citations (Scopus)
96 Downloads (Pure)

Abstract

Uranium mononitride, UN, is considered a potential accident tolerant fuel due to its high uranium density, high thermal conductivity, and high melting point. Compared with the relatively inert UO 2 , UN has a high reactivity in water, however, studies have not considered the significant effect of radiation, which is known to cause corrosion of UO 2 . This study uses 0.1 M H 2 O 2 to simulate the effects of water radiolysis in order to compare the radiolytic corrosion rates of UO 2 , UN, and U 2 N 3 thin films at room temperature. X-ray reflectivity was used to investigate the changes in film morphology as a function of H 2 O 2 exposure time, allowing changes in film thickness and roughness to be observed on the Ångstrom length-scale. Results showed significant differences between UO 2 , UN, and U 2 N 3 , with corrosion rates of 0.083(3), 0.020(4), and 0.47(8) Å/s, respectively, showing that UN corrodes more slowly than UO 2 in 0.1 M H 2 O 2 .

Original languageEnglish
Pages (from-to)202-207
Number of pages6
JournalJournal of Nuclear Materials
Volume518
Early online date9 Mar 2019
DOIs
Publication statusPublished - 1 May 2019

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