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Rani, Nishi
- A Review on Corrosion Mechanism in the Borosilicate Nuclear Waste Glass for Long-Term Performance Assessments in Geological Repository
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Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
2 BETDD, Nuclear Recycle Group, BARC, Mumbai - 400 008, IN
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
2 BETDD, Nuclear Recycle Group, BARC, Mumbai - 400 008, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 2 (2008), Pagination: 238-244Abstract
Glass is an important material used for high-level nuclear waste (HLW) management, accommodates and immobilizes several constituents. The ability ot the nuclear waste glasses is to contain high-level radioactive wastes over the service life of a potential geologic repository. The corrosion of a complex waste glass is governed by two basic mechanisms, such as, ion exchange and hydrolysis. In the present review paper, leach rate experiments under accelerated pressure, temperature and controlled pH conditions are suggested to insight corrosion mechanism of complex nuclear waste glasses. The data obtained is required to be simulated, using geochemical codes to extrapolate corrosion of glass for long term performances assessments in the geological repository.Keywords
Corrosion, Leaching, Vitrification, Geological Lepository, Geochemical Codes.
- Long-Term Performance Assessment of Nuclear Waste and Natural Glasses in the Geological Repository: a Geochemical Modelling
Abstract Views :238 |
PDF Views:97
Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi 110 007, IN
2 Nuclear Recycle Group, BARC, Mumbai 400 008, IN
1 Department of Geology, University of Delhi, Delhi 110 007, IN
2 Nuclear Recycle Group, BARC, Mumbai 400 008, IN
Source
Current Science, Vol 110, No 2 (2016), Pagination: 214-219Abstract
Nuclear waste loaded and natural (analogue) glasses were studied to understand neo-formed mineral species, formed in equilibrium with the physico-chemical conditions existing in the geological repository. To predict alteration-phases, dissolution equations for average vitrification system (AVS), barium borosilicate (BBS) and obsidian glass were calculated, considering glass composition, pressure, temperature and pH conditions. Progress of reaction plotted against saturation index, indicates saturation with solid phases - chamosite, chalcedony and Ca-beidellite in obsidian; greenalite and fayalite in AVS; and coffinite BBS glass. Activities and molalities of aqueous species together with the number of moles of each mineral species produced and degenerated during the progress of the reaction (as a function of time) are discussed in this communication.Keywords
Geochemical Modelling, Geological Repository, Natural Glass, Nuclear Waste.Full Text
References
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- Near Hydrothermal Alteration of Obsidian Glass: Implications for Long Term Performance Assessments
Abstract Views :175 |
PDF Views:0
Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
2 BETDD, Nuclear Recycle Group, BARC, Mumbai - 400 008, IN
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
2 BETDD, Nuclear Recycle Group, BARC, Mumbai - 400 008, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 4 (2012), Pagination: 376-382Abstract
Obsidian glass alteration experiments under near hydrothermal conditions were performed to study mechanism and conditions of formation of altered minerals. X-ray diffraction patterns and cell dimensions of the specimens treated at 150, 200 and 300°C (pH = 8.03) revealed appearance of three main minerals - illite (9.5-10 Å), chlorite (7.04 Å) and halloysite (10.25Å). Further increase in the pH favours matrix dissolution with the formation of secondary altered layers. SEM-EDS study show that the alteration causes smoothing of the grain surfaces. These surfaces exhibits etch pits and series of depressions, formed by the process of dissolution. SEM - Back Scattered Electron images of obsidian specimens show thin laminae of smectite, with foliated bulky rims and cellular honeycomb texture, formed by precipitation from the solution as well as by direct transformation of glass during alteration. This mechanism is resulting from the alteration of alkalis by ionic inter-diffusion with H3O+ and H+ and inward diffusion of H2O, leading to free diffusion of silica into solution and then to a local rearrangement of the glass framework. Thus, a direct transformation of glass into clay minerals is the major reaction mechanism as evidenced by the mechanism of glass dissolution and subsequent mineral precipitation.Keywords
Near Hydrothermal Condition, Geological Repository, Dissolution, Mineral Precipitation.References
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