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NEA-1057 MELODIE.

MELODIE, Radiological Assessment of Nuclear Waste Migration in Ground Water

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1. NAME OR DESIGNATION OF PROGRAM:  MELODIE.
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2. COMPUTERS
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Program name Package id Status Status date
MELODIE NEA-1057/02 Tested 16-APR-1993
MELODIE NEA-1057/03 Report 29-APR-1997

Machines used:

Package ID Orig. computer Test computer
NEA-1057/02 CRAY X-MP CRAY X-MP
NEA-1057/03 UNIX W.S.
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3. DESCRIPTION OF PROGRAM OR FUNCTION

MELODIE assesses radiological consequences associated with a nuclear waste repository in a deep geological formation. MELODIE consists of three parts: MELO for deterministic evaluation; PREP and SPOP for sensitivity and uncertainty analysis:

MELO is a modular deterministic code composed mainly of a geosphere model adopted from METIS, developed at the Ecole Nationale Superieure des Mines de Paris; and of the ABRICOT biosphere model, developed at CEA/IPSN.

- The geosphere model is a 2D finite element code which first solves the groundwater flow equation (considered as a steady state), and then in a second step the transport (advection-diffusion-dispersion) equation for each radionuclide. The geosphere is taken into account  as an equivalent porous medium with explicit description of the main fractures. The retardation of the radionuclides is modeled through the Kd concept, and nuclear decay chains are processed inside this model.

The boundary conditions represent:

. for the groundwater flow calculation, the hydraulic head or the groundwater flow rate;

. for the transport calculation, the activity released by the repository itself to the geosphere (using, for low soluble radionuclides, the solubility limit concept). Three cases may be taken into account for computing the value of this boundary condition: consequence of the degradation of the matrix (vitrified waste, ...); uniform release during a given period of time; waste already degradated at the initial time.

- The biosphere model converts the activity released at the water outlets to the corresponding individual dose through intake, inhalation, or external irradiation from the use of contaminated water in the main food chains. This model is compartimental and takes into account farming and dietetic considerations.

- PREP provides samples using the Latin Hypercube techniques for the distribution functions of the input variables, such as permeability, solubility limit value for radionuclides, retardation factors, etc.
- SPOP performs uncertainty and sensitivity analyses on the output of the MELO simulation runs. PREP and SPOP have been developed at the Joint Research Centre of the European Communities.
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4. METHOD OF SOLUTION

The equation systems are discretized by the method of Galerkin using elements of four, three and two nodes. The  algebraic equations are solved by the direct Gauss algorithm. The time discretization is made by the Crank-Nicholson method.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Groundwater flow is  considered at a steady state and in a saturated medium. Thermal effects are not taken into account.
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6. TYPICAL RUNNING TIME

The computation time of the two MELODIE test  cases are the following:
- Test1 (MELODIE transport calculation): about 32 seconds;
- Test2 (MELODIE steady-state flow sensitivity calculation): about  22 seconds.
The PREP test problem setup for 100 runs and 14 variables requires 0.44 seconds.
The SPOP test problem setup for 100 runs and 14 variables requires 10.8 seconds.
NEA 1057/02: NEA-DB executed the sample cases of the programs included in this package on a CRAY-XMS. The followingt CPU times were required: PREP: 2sec.; MELODIE case 1: 4min; MELODIE case 2: 1min; SPOP: 27sec.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

PREP requires the IMSL and BBLMATH  libraries. SPOP requires IMSL.
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9. STATUS
Package ID Status date Status
NEA-1057/02 16-APR-1993 Tested at NEADB
NEA-1057/03 29-APR-1997 Report Only
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10. REFERENCES:
NEA-1057/02, included references:
- Marc Bourgeois:
  MODELE MELODIE - Evaluation de l'Impact Radiologioque Post
  Fermeture d'un Stockage de Dechets Radioactifs en Formation
  Geologique Profonde
  Volume I   - Notice Theorique
               Not/The No.0/48 Rev. A (Fevrier 1, 1991).
  Volume II  - Techniques de Programmation
               Tec/Pro No.0/45 Rev. B (Fevrier 1, 1991).
  Volume III - Notice d'Utilisation
               Not/Uti No.0/99 Rev. A (Fevrier 12, 1991).
NEA-1057/03, included references:
- M. Bourgeois and C. Serres:
  Modelisation du Terme Source dans le Code de Calcul MELODIE
  DPRE/SERGD Rapport technique 97/06
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11. MACHINE REQUIREMENTS

Test1 requires 103,275 words; Test2 requires  120,769 words of main storage.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-1057/02 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  UNICOS (CRAY).
NEA-1057/02
UNICOS 6.1 with compiler CFT77 5.0.1.0 (CRAY XMS).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

Commissariat a l'Energie Atomique
Institut de Protection et de Surete Nucleaire
Departement d'Evaluation de la Surete
Service d'Evaluation de la Surete des Installations de traitement,
d'entreposage et de stockage des Dechets.
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16. MATERIAL AVAILABLE
NEA-1057/03
report                   DPRE/SERGD 97/06                           REPPT
NEA-1057/02
File name File description Records
NEA1057_02.001 Information file 76
NEA1057_02.002 JCL to run PREP, MELODIE and SPOP programs 14
NEA1057_02.003 PREP FORTRAN 77 source program 1299
NEA1057_02.004 PREP sample input test case 85
NEA1057_02.005 MELODIE FORTRAN 77 source program 217
NEA1057_02.006 Library FORTRAN 77 source subroutines 15462
NEA1057_02.007 CRAY emulation of IMSL routines 1558
NEA1057_02.008 MELODIE sample input test case 1 2055
NEA1057_02.009 MELODIE sample input test case 2 2190
NEA1057_02.010 SPOP FORTRAN 77 source program 2102
NEA1057_02.011 SPOP sample input test case 312
NEA1057_02.012 MELODIE sample output test case 1 635
NEA1057_02.013 MELODIE test case 1 unit fort.16 4256
NEA1057_02.014 MELODIE test case 1 unit fort.31 955
NEA1057_02.015 MELODIE test case 1 unit fort.32 212
NEA1057_02.016 MELODIE test case 1 unit fort.33 841
NEA1057_02.017 MELODIE test case 1 unit fort.41 188
NEA1057_02.018 MELODIE test case 1 unit fort.42 188
NEA1057_02.019 MELODIE test case 1 unit fort.53 188
NEA1057_02.020 MELODIE test case 1 unit fort.61 188
NEA1057_02.021 MELODIE test case 1 unit fort.62 188
NEA1057_02.022 MELODIE test case 1 unit fort.63 96
NEA1057_02.023 MELODIE sample output test case 2 5036
NEA1057_02.024 MELODIE output test case 2 unit FORT.13 1750
NEA1057_02.025 MELODIE output test case 2 unit FORT.14 12054
NEA1057_02.026 MELODIE output test case 2 unit FORT.15 13300
NEA1057_02.027 MELODIE output test case 2 unit FORT.40 304
NEA1057_02.028 PREP sample output test case 506
NEA1057_02.029 PREP sample output unit FORT.50 300
NEA1057_02.030 SPOP sample output test case 1987
NEA1057_02.031 SPOP sample output test case unit FORT.33 10
NEA1057_02.032 SPOP sample output test case unit FORT.41 105
NEA1057_02.033 SPOP sample output test case unit FORT.42 110
NEA1057_02.034 SPOP sample output test case unit FORT.52 29
NEA1057_02.035 SPOP sample output test case unit FORT.53 74
NEA1057_02.036 SPOP sample output test case unit FORT.54 74
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17. CATEGORIES
  • R. Environmental and Earth Sciences

Keywords: convection, diffusion, dispersions, finite elements, ground water, radioactive waste storage, radionuclide migration, sensitivity analysis, solubility, statistics, systems analysis, two-dimensional.