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Long-Term Performance Assessment of Nuclear Waste and Natural Glasses in the Geological Repository: a Geochemical Modelling


Affiliations
1 Department of Geology, University of Delhi, Delhi 110 007, India
2 Nuclear Recycle Group, BARC, Mumbai 400 008, India
 

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.
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  • Phillips, L. D., Dwyer, D. B. and Dabur Research Foundation, Sustainable harvesting of Himalayan yews. In Medicinal Plant Trade in Europe: Conservation and Supply, Proceedings of the First International Symposium on Conservation of Medicinal Plants in Trade in Europe, 22-23 June 1998, Royal Botanic Gardens, Kew, United Kingdom, TRAFFIC Europe, WWF-Belgium.Brussels, Belgium, 1999, pp. 147-154.

  • Saqib, Z., Malik, R. N. and Husain, S. Z., Modeling potential distribution of Taxus wallichiana in Palas Valley, Pakistan. Pak.J. Bot., 2006, 38(3), 539-542.

  • Shukla, G. P., Rao, K. and Haridasan, K., Taxus baccata in Arunachal Pradesh. Arunachal For. News, 1994, 12(1), 1-7.

  • Beniwal, B. S. and Haridasan, K., Natural distribution and status of regeneration of gymnosperms in Arunachal Pradesh. Indian For., 1992, 118, 96-101.

  • Haridasan, K., Sarmah, A. and Bhuyan, L. R., Gymnosperm diversity in Arunachal Pradesh. Arunachal For. News, Bio-Divers.Spec., 2001, 19, 32-42.

  • Schippmann, U., Medicinal plants significant trade study. CITES Project S-109, German Federal Agency for Nature Conservation, Bonn, Germany, 2001.

  • Wani, M. C., Taylor, H. L., Wall, M. E., Cogon, P. and McPhail, A. T., Plant antitumor agents. VI. Isolation and structure of taxol, a novel antileukemic and antitumor agent from Taxus brevifolia

  • J. Am. Chem. Soc., 1976, 93(9), 2325-2327.

  • Purohit, A., Maikhuri, R. K., Rao, K. S. and Nautiyal, S., Impact of bark removal on survival of Taxus baccata L. (Himalayan yew) in Nanda Devi Biosphere Reserve, Garhwal Himalaya, India.

  • Curr. Sci., 2001, 81(5), 586-590.

  • Stierle, A., Strobel, G. and Stierle, D., Taxol and taxane production by Taxomyces andreanae, an endophytic funguan of Pacific Yew. Science, 1993, 260, 214-222.

  • Ge, J., Ping, W. and Zhou, D., Characterization of a new species of taxol-producing fungus. Nature Sci., 2004, 2, 85-88.

  • Cameron, S. I. and Smith, R. F., In Bringing ‘Blue Sky Biology’ Down to Earth: Linking Natural Products Research with Commercialization, Proceedings of the 29th Annual Meeting of the Plant Growth Regulation Society of America, Halifax, NS, Canada, 2002, pp. 31-39.

  • Gaur, R. D., Flora of the District Garhwal North West Himalaya with Ethnobotanical Notes, Trans Media, Srinagar (Garhwal), 1999, p. 48.

  • Beckstrom-Sternberg, S. M. and Duke, J. A., In International Yew Resource Conference, Berkeley, USA, 1993, p. 3.

  • Maikhuri, R. K., Nautiyal, S. and Rao, K. S., Role of medicinal plants in traditional health care system: a case study from Nanda Devi Biosphere Reserve. Curr. Sci., 1998, 75, 152-157.

  • Grassischolar_mains Options, North East India's first magazine on people, environment and development, Monsoon-Autumn Issue, 2002.

  • Mishra, M. K. and Dutta, R., Draft report, base line information on medicinal plants conservation and sustainable utilization, Foundation for Revitalisation of Local Health Traditions (FRLHT), Bangalore, 2003, pp. 1-49.

  • Grinnell, J., Field tests of theories concerning distributional control.Am. Nat., 1917, 51, 115-128.

  • Carpenter, G., Gillison, A. N. and Winter, J., DOMAIN: a flexible modeling procedure for mapping potential distribution of plants and animals. Biodivers. Conserv., 1993, 2, 667-680.

  • Meyer, E. M., Peterson, A. T., Servina, J. I. and Kiff, L. F. Ecological niche modeling and prioritizing areas for species reintroductions.Oryx, 2006, 40(4), 411-418.

  • Menon, S., Choudhury, B. I., Khan, M. L. and Peterson, A. T., Ecological niche modeling and local knowledge predict new population of Gymnocladus assamicus, a critically endangered tree species. Endangered Species Res., 2010, 11, 175-181.

  • Phillips, S. J., Anderson, R. P. and Schapire, R. E., Maximum entropy modeling of species geographic distributions. Ecol. Model., 2006, 190, 231-259.

  • Benito, M. B., Martinez-Ortega, M. M. and Munoz, L. M., Assessing extinction-risk of endangered plants using species distribution models: a case study of habitat depletion caused by the spread of greenhouses. Biodivers. Conserv., 2009, 18, 2509-2520.

  • Singh, G., Velmurugan, A. and Dakhate, M. P., Geospatial approach for tiger habitat evaluation and distribution in Corbett Tiger Reserve, India. J. Indian Soc. Remote Sensing, 2009, 37, 573-585.

  • Curtis, J. T., The Vegetation of Wisconsin. An Ordination of Plant Communities, University Wisconsin Press, Madison, Wisconsin, USA, 1959.

  • Keeratikasikorn, C. and Trisirisatayawong, I., Reconstruction of 30 m DEM from 90 m SRTM DEM with bicubic polynomial interpolation method. Int. Arch. Photogramm., Remote Sensing Spatial Inf. Sci., 2008, XXXVII, 791-794.

  • Richards, J. A., Remote Sensing Digital Image Analysis: An Introduction, Springer-Verlag, Heidelberg, Germany, 1993, 2nd edn.

  • Nimachow, G., Rawat, J. S. and Dai, O., Status of Himalayan yews in West Kameng district of Arunachal Pradesh. Curr. Sci., 2010, 98(11), 1434-1437.

  • Gupta, P., Losing naturally: clandestine trading in a medicinal plant costs India dearly, 6-12 February 1994.

  • Agarwal, A. and Srivastava, G., Forest destruction in Eastern Himalayas. Curr. Sci., 2008, 94(1), 8.

  • Kanade, R., Tadwalkar, M., Kushalappa, C. and Patwardhan, A., Vegetation composition and woody species diversity at Chamoli NP, Northern Western Ghats, India. Curr. Sci., 2008, 95(5), 637- 646.

  • Piovesan, G., Saba, E. P., Biondi, F., Alessandrini, A., Filippo, A.and Schirone, B., Population ecology of yew (Taxus baccata L.) in the Central Apennines: spatial patterns and their relevance for conservation strategies. Plant Ecol., 2009, doi: 10.1007/s11258009-9596-1

  • Kwit, C., Horvitz, C. C. and Platt, W. J., Conserving slowgrowing, long-lived tree species: input from the demography of a rare understory conifer, Taxus floridana. Conserv. Biol., 2004, 18, 432-443.

  • Hageneder, F., Yew - A History, Sutton Publishing Ltd., Stroud, NY, USA, 2007.

  • Scarnati, L., Attorre, F., Sanctis, M., Farcomeni, A., Francesconi, F., Mancini, M. and Bruno, F., A multiple approach for the evaluation of the spatial distribution and dynamics of a forest habitat: the case of Apennine beech forests with Taxus baccata and Ilex aquifolium. Biodivers. Conserv., 2009, doi: 10.1007/ s10531-009-9629-z.


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  • Long-Term Performance Assessment of Nuclear Waste and Natural Glasses in the Geological Repository: a Geochemical Modelling

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Authors

Nishi Rani
Department of Geology, University of Delhi, Delhi 110 007, India
J. P. Shrivastava
Department of Geology, University of Delhi, Delhi 110 007, India
R. K. Bajpai
Nuclear Recycle Group, BARC, Mumbai 400 008, India

Abstract


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.

References





DOI: https://doi.org/10.18520/cs%2Fv110%2Fi2%2F214-219