• Citer

Applications of an adjoint Monte Carlo method to the underground migration of radionuclides over large scales

par Smidts, Olivier
Référence Annals of nuclear energy, 29, 6, page (717-750)
Publication Publié, 2002-04

Article révisé par les pairs

• Accès en ligne
• Détails
• Contenu
• Statistiques

Résumé :

An adjoint Monte Carlo method has been applied recently to the transport of dissolved radionuclide chains through a saturated porous medium [Smidts, O.F., Devooght, J., 1998a. Analysis of the transport of radionuclide chains in a stochastic geological medium by a biased Monte Carlo simulation. Nuclear Science and Engineering 129, 224-245. (+corrigendum, 130, 164); Smidts, O.F., 1998. Point and surface estimations by a non-analog Monte Carlo simulation for the transport of radionuclide chains in porous media. Monte Carlo Methods and Applications 4(4), 289-318; Smidts, O.F., 1999. TRACKS: an efficient particle tracking code for the migration of radionuclide chains with uncertain site characterisation. In: Proceedings ENS Topseal'99: Commitment to the Future Environment, Vol. 2.]. We give, first, a general introduction of the method. We emphasize on the problem of the accurate estimation of local concentrations or cumulative concentrations over the geosphere-biosphere interface and the migration of multiple species in a radionuclide chain. Then, to study the impact of highly heterogeneous retardation factor on transport, we present an approximate semi-analytical solution for the transport of a radionuclide. Finally, numerical tests, including migration of radionuclide chains over large distances, are defined and several comparisons are made with analytical and semi-analytical solutions to verify the Monte Carlo method and its related transport code TRACKS on 1D and 3D transport problems. The results are presented and discussed for highly heterogeneous retardation factor. © 2002 Elsevier Science Ltd. All rights reserved.