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On Alteration Rate Renewal Stage of Nuclear Waste Glass Corrosion

Published online by Cambridge University Press:  24 January 2020

Michael I. Ojovan Open the ORCID record for Michael I. Ojovan [Opens in a new window]
Michael I. Ojovan*
Affiliation:
Department of Materials Science and Engineering, The University of Sheffield, UK; m.ojovan@sheffield.ac.uk
*
*(Email: M.I.Ojovan@gmail.com)
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Abstract:

The three generically accepted stages of glass corrosion are reviewed with focus on final stage termed alteration rate renewal (or resumption) stage when the glass may re-start corroding with the rate similar to that at the initial stage. It is emphasized that physical state and physical changes that occur in the near-surface layers can readily lead to an effective increase of leaching rate which is similar to alteration rate renewals. Experimental data on long-term (during few decades) corrosion of radioactive borosilicate glass K26 designed to immobilize high-sodium operational NPP radioactive waste evidence on resumption-like effects of radionuclides (137,134Cs) leaching. The cause of that was however related not to chemical changes in the leaching environment but rather to physical state of glass surface due to formation of small cracks and new pristine glass areas in contact with water.

Keywords

glasscorrosionwaste managementenvironmentally protective
Type
Articles
Information
MRS Advances , Volume 5 , Issue 3-4: Scientific Basis for Nuclear Waste Management XLIII , 2020 , pp. 111 - 120
Copyright
Copyright © Materials Research Society 2020

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