Reducing the uncertainty of nuclear fuel dissolution: An investigation of UO2 analogue CeO2

Claire L. Corkhill, Daniel J. Bailey, Stephanie M. Thornber, Martin C. Stennett, Neil C. Hyatt

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

1 Citation (Scopus)

Abstract

In this investigation, CeO2 analogues, which approximate as closely as possible the characteristics of fuel-grade UO2, were characterised after dissolution under a wide range of conditions. Powdered samples were subject to a range of aggressive and environmentally relevant alteration media with different solubility controls, and reacted at 70°C and 90°C. Dissolution kinetics were monitored through analysis of the coexisting aqueous solution. Monolith samples were monitored for development of surface defects such as pores and dissolution pits, in addition to morphological changes at grain boundaries and surface pores upon dissolution under aggressive conditions. The surfaces were analysed using confocal profilometry, vertical scanning interferometry and scanning electron microscopy. Dissolution rates were found to be greatest in low pH solutions and at higher temperatures. Preferential dissolution appears to occur at grain boundaries and on particular grains, suggesting a crystallographic control on dissolution.

Original languageEnglish
Title of host publicationScientific Basis for Nuclear Waste Management XXXVI
Pages151-156
Number of pages6
DOIs
Publication statusPublished - 2013
Event2012 MRS Fall Meeting - Boston, MA, United States
Duration: 25 Nov 201230 Nov 2012

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1518
ISSN (Print)0272-9172

Conference

Conference2012 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA
Period25/11/1230/11/12

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