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Development of the Code Melodie for Long Term Risk Assessment of Nuclear Waste Repositories

Published online by Cambridge University Press:  28 February 2011

P. Goblet ,
P. Guetat ,
J. Lewi ,
J-P Mangin ,
G. De Marsily  and
P. Raimbault
P. Goblet
Affiliation:
Centre d'Information Géologique (Ecole Nationale Supérieure des Mines de Paris)
P. Guetat
Affiliation:
Commissariat à l'Energie Atomique/Institut de Protection et de Sûreté Nucléaire/Département de Protection Technique (CEA/IPSN/DPT)
J. Lewi
Affiliation:
Commissariat à l'Energie Atomique/Institut de Protection et de Sûreté Nucléaire/Département d'Analyse de Sûreté (CEA/IPSN/DAS)
J-P Mangin
Affiliation:
Commissariat à l'Energie Atomique/Institut de Recherce Technologique et de Développement Industriel/Département de Recherche et Développement Déchets (CEA/IRDI/DRDD)
G. De Marsily
Affiliation:
Centre d'Information Géologique (Ecole Nationale Supérieure des Mines de Paris)
P. Raimbault
Affiliation:
Commissariat à l'Energie Atomique/Institut de Protection et de Sûreté Nucléaire/Département d'Analyse de Sûreté (CEA/IPSN/DAS)
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Abstract

MELODIE is a computer code developed at the CEA/IPSN for risk assessment of nuclear waste repositories in geological formations. The interactive evolution of the source, geosphere and biosphere is studied for periods of time longer than 100 000 years. In its first version, the code can describe a repository in granite rock located at a specific site.

The code is built in a modular form which allows to use different versions of the sub-system models.

The basic model for radionuclide migration and hydrpgeology is a subroutine version of the METIS code developed by ENSMP. METIS is a 2D finite element code which solves the advection-dispersion equation for porous media with explicit fracture representation. Linear adsorption kinetics is included as well as matrix diffusion and radionuclide decay chains.

The source model developed at CEA/DRDD**** is derived from CONDIMENT which is a 1D finite difference code describing the behaviour of high level waste packages. Four axisymetric layers are individualized: glass matrix, container, bentonite and granite. The glass leaching is modelled as a dissolution and diffusion process of the individual chemical components.

The biosphere model ABRICOT developed at the CEA/DPT** is based on a detailed description of agricultural activities defined in individual systems.

MELODIE is tested by participation to international exercices such as Pagis [1], Intracoin [2] and Hydrocoin [3]. Future developments will include introduction of scenarios constructed from geoprospective studies and algorithms for sensitivity studies.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 50: Symposium STOCKHOLM – Scientific Basis for Nuclear Waste Management IX , 1985 , 817
Copyright
Copyright © Materials Research Society 1985

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References

1. Pagis. Summary Report of Phase 1 Joint Research Centre - ISPRA EUR 9220 EN. (1984)Google Scholar
2. Intracoin. Final Report level 1,SKI 84: 3 September 1984 Google Scholar
3. Hydrocoin. Progress Report no.1,SKI May 1984 – December 1984 Google Scholar