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Modelling the Release of Radionuclides from the Spent Fuel and their Transport in the Near Field: a Coupled Approach

  • Juan Merino (a1), Esther Cera (a1), Jordi Bruno (a1) and Aurora Martínez-Esparza (a2)

Abstract

In this work we have developed a model for the release of radionuclides from the spent fuel coupled with their transport through the near field. A compartmental approach has been used, as this methodology is well suited to model integrated systems. Several processes have been taken into account: oxidative dissolution of the spent fuel matrix, radioactive decay and chains, diffusive and advective transport, retardation by sorption and secondary phase precipitation. Results illustrate the complex evolution of the radionuclide concentrations in the gap and the near field. Hence, the main conclusion from this study is the requirement to model this coupled system using a compartmental integrated approach.

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1. Bruno, J., Cera, E., Duro, L., Eriksen, T.E. and Werme, L.O., 1996. A kinetic model for the stability of spent fuel matrix under oxic conditions. J. Nucl. Mater. 238, 110120.
2. Cera, E., Merino, J., Bruno, J., 2000. Release of radionuclides from spent fuel under repository conditions: mathematical modelling and preliminary results. In: Scientific Basis for Nuclear Waste Management XXIV, edited by Hart, K.P. and Lumpkin, G.R. (Mat. Res. Soc. Symp. Proc. 663, 2000), pp. 459467.
3. Enresa 2000. Evaluación del comportamiento y de la seguridad de un almacenamiento de combustible gastado en una formación granítica. Proyecto AGP, 49–1PP-M–1–501.
4. AMBER 4.4 Reference Guide, April 2002. Enviros QuantiSci, Culham, UK.
5. Merino, J., Cera, E., Bruno, J., Eriksen, T., Quiñones, J. and Martínez-Esparza, A., 2001. Long term modelling of spent fuel oxidation/dissolution under repository conditions. In: 8th International Conference on Radioactive Waste Management and Environmental Remediation. Bruges, Belgium, 30 Sept. – 4 Oct. 2001.

Modelling the Release of Radionuclides from the Spent Fuel and their Transport in the Near Field: a Coupled Approach

  • Juan Merino (a1), Esther Cera (a1), Jordi Bruno (a1) and Aurora Martínez-Esparza (a2)

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