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Radionuclides Transport Phenomena in Vadose Zone

Authors: R. Testoni, R. Levizzari, M. De Salve


Radioactive waste management is fundamental to safeguard population and environment by radiological risks. Environmental assessment of a site, where nuclear activities are located, allows understanding the hydro geological system and the radionuclides transport in groundwater and subsoil. Use of dedicated software is the basis of transport phenomena investigation and for dynamic scenarios prediction; this permits to understand the evolution of accidental contamination events, but at the same time the potentiality of the software itself can be verified. The aim of this paper is to perform a numerical analysis by means of HYDRUS 1D code, so as to evaluate radionuclides transport in a nuclear site in Piedmont region (Italy). In particular, the behavior in vadose zone was investigated. An iterative assessment process was performed for risk assessment of radioactive contamination. The analysis therein developed considers the following aspects: i) hydro geological site characterization; ii) individuation of the main intrinsic and external site factors influencing water flow and radionuclides transport phenomena; iii) software potential for radionuclides leakage simulation purposes.

Keywords: Site characterization, HYDRUS 1D, radionuclides transport phenomena

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[1] International Atomic Energy Agency, "The Safety Case and Safety Assessment for the Disposal of Radioactive Waste", IAEA, Safety Standards Series No. SSG-23, Vienna, 2012.
[2] A. Di Molfetta, "Soluzioni analitiche dell'equazione differenziale del trasporto di massa per soluti non reattivi e reattivi”, Torino: POLITEKO EDIZIONI, 2002, pp. 237-254.
[3] J. Simunek, M. Sejna, H. Saito, M. Sakai, and M. T. Van Genuchten, "The HYDRUS-1D Software Package for Simulating the One-Dimensional Movement of Water, Heat and Multiple Solutes in Variably-Saturated Media", Version 4.17, HYDRUS Software Series 3 Department of Environmental Sciences, University of California Riverside, Riverside, California, USA, 2013.
[4] A. Harbaugh, "MODFLOW-2005, the U.S. Geological Survey Modular Ground-Water Model - The Ground-Water Flow Process", U.S. Geological Survey Techniques and Methods 6-A1, Reston, Virginia, 2005.
[5] C. Appelo and D. Parkhust, "User's guide to PHREEQC (version 2) - A computer program for speciation, batch-reaction, one-dimensional transport and inverse geochemical calculations", Water-Resources Investigation Report 99-4259, U.S. Department of the Interior and U.S. Geological Survey, 1999.
[6] C. Zheng and P. P. Wang, "MT3DMS - A modular three-dimensional multispecies transport model for simulation of advection, dispersion, and chemical reactions of contaminants in groundwater systems; documentation and user’s guide", Contract Report SERDP-99-1, U.S. Army Engineer Research and Development Center, Vicksburg, MS, 1999.
[7] N. K. C. Twarakavi, J. Šimůnek, and H. S. Seo, "Evaluating interactions between groundwater and vadose zone using HYDRUS-based flow package for MODFLOW," Vadose Zone Journal, vol. 7, no. 2, pp. 757-768, 2008.
[8] Agenzia Regionale per la Protezione Ambientale, "Attività di controllo dei waste pond del sito EUREX-S.O.G.I.N. di Saluggia (Vc)", ARPA - Relazione Tecnica n.5/SS21.02/2013, Ivrea (Torino), Italy, Aprile 2013.
[9] S. Neuman, "Galerkin approch to saturated-unsaturated flow in porous media", Chapter 10 in Finite Elements in Fluids, Vol. I, Viscous Flow and Hydrodynamics, London: John Wiley & Sons, 1975, pp. 201-217.
[10] G. Pinder and W. Gray, "Finite Element Simulation in Surface and Subsurface Hydrology”, New York: Academic Press, 1977.
[11] M. Van Genuchten, "A closed-form equation for predicting the hydraulic conductivity of unsaturated soils", Soil Science Society of America Journal, pp. 892-898, 1980.
[12] R. Carsel and R. Parrish, "Developing joint probability distributions of soil water retention characteristics", Water Resources Research, vol. 24, pp. 755-769, 1988.
[13] W. Rawls, D. Brakensiek, and K. Saxton, "Estimating soil water properties," Transactions, ASAE , vol. 25, no. 5, pp. 1316-1320 and 1328, 1982.
[14] R. Brooks and A. Corey, "Hydraulic properties of porous media", Hydrology Paper No. 3, Colorado State University, Fort Collins, CO, 1964.
[15] M. Schaap, F. Leji, and M. Van Genuchten, "Rosetta: a computer program for estimating soil hydraulic parameters with hierarchical pedotransfer function", Journal of Hydrology, pp. 163-176, 2001.
[16] S. Iezzi, M. Imperi, M. Rosati, and G. Ventura, "Hydrogeological studies for radiological monitoring of shallow groundwater in the EUREX plant of Saluggia (Vercelli, Italy)", Radiation Protection Dosimetry, vol. 137, no. 3-4, pp. 306-309, 2009.
[17] Environmental Protection Agency, "Understanding variation in partition coefficient, Kd, values - Volume I: The Kd model, methods of measurement, and application of chemical reaction codes", EPA 402-R-99-004A, Washington, 1999.
[18] Environmental Protection Agency, "Understanding variation in partition coefficient, Kd, values - Volume II: Review of geochemistry and available Kd values for Cadmium, Cesium, Chromium, Lead, Plutonium, Radon, Strontium, Thorium, Tritium (3H), and Uranium", EPA 402-R-99-004B, Washington, 1999.
[19] Environmental Protection Agency, "Understanding variation in partition coefficient, Kd, values - Volume III: Review of geochemistry and available Kd values for Americium, Arsenic, Curium, Iodine, Neptunium, Radium, and Technetium", EPA 402-R-04-002C, Washington, 2004.
[20] R. Serne, "Kd Values for Agricultural and Surface Soils for Use in Hanford Site Farm, Residential, and River Shoreline Scenarios - Technical Report for Groundwater Protection Project -- Characterization of Systems Task", Pacific Northwest National Laboratory - PNNL-16531, Washington, 2007.