Computer Programs
NEA-1889 MEGA.
last modified: 16-MAR-2016 | catalog | categories | new | search |

NEA-1889 MEGA.

MEGA, Mechanistic and Engineering Fission Gas Release Model for a Uranium Dioxide Fuel

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1. NAME OR DESIGNATION OF PROGRAM

MEGA

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2. COMPUTERS
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Program name Package id Status Status date
MEGA NEA-1889/01 Tested 16-MAR-2016

Machines used:

Package ID Orig. computer Test computer
NEA-1889/01 MAC,Linux-based PC,PC Windows PC Windows
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3. DESCRIPTION OF PROGRAM OR FUNCTION

MEGA is a mechanistic and engineering fission gas release prediction model for UO2 fuel. It is based upon the diffusional release of fission gases from inside the grain to the grain boundary, and the release of fission gases from the grain boundary to the external surface by an interconnection of the fission gas bubbles in the grain boundary. The capability of the MEGA model was validated by a comparison with the fission gas release data base and sensitivity analyses of the parameters. It was found that the MEGA model could correctly predict the fission gas release in the broad range of a fuel burnup up to 98 MWd/kgU. Especially, the enhancement of fission gas release in a high burnup fuel, and the reduction of fission gas release at a high burnup by increasing the UO2 grain size are found to be correctly predicted by the MEGA model.

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4. METHODS

MEGA solves numerically the time and space-dependent differential equations.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

None.

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6. TYPICAL RUNNING TIME

Less than 10 seconds.

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7. UNUSUAL FEATURES OF THE PROGRAM

None.

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8. RELATED OR AUXILIARY PROGRAMS

None.

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9. STATUS
Package ID Status date Status
NEA-1889/01 16-MAR-2016 Tested at NEADB
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10. REFERENCES

- Chan Bock LEE, Yong Sik YANG, Dae Ho KIM, Sun Ki KIM and Je Geun BANG, “A New Mechanistic and Engineering Fission Gas Release Model for a Uranium Dioxide Fuel”, Journal of NUCLEAR SCIENCE and TECHNOLOGY, Vol. 45, No. 1, p. 60–71, 2008.

NEA-1889/01, included references:
- Jin-Sik Cheon an Chan Bock Lee:
How to make MEGA executable with CVF and ifort, KAERI, 2015/11
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11. HARDWARE REQUIREMENTS

PC, Mac or Workstation.

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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-1889/01 FORTRAN
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13. SOFTWARE REQUIREMENTS

This program is executed on MS-Windows. It can be run on OS X and Linux with a Fortran equivalent compiler.

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15. NAME AND ESTABLISHMENT OF AUTHORS

Chan Bock Lee and Yong Sik Yang

KAERI (Korea Atomic Energy Institute)

KAERI

Yusung P.O. Box 105

Daejeon 305-600

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16. MATERIAL AVAILABLE
NEA-1889/01
How-to-make-MEGA.docx     Instructions to compile and link the program
MEGA.OUT       Output provided by the author
mega.xlsx      Plot of the output
readme.txt     command to launch the compilation from the command prompt
with Compaq Visual Fortran
mega.dsp         Project definition for the Windows version of Compaq
mega.dsw        Visual Fortran
DF60.PDB         Project with Compaq Visual Fortran (Windows)
mega-driver.obj Object file
mega.exe        Executable
mega.obj        Object file
MEGA.OUT        Output file
mega.pdb        Debug file
readme.txt     Command to launch the compilation from the command prompt with
Intel Fortran
MEGA.OUT         Project definition for the Windows version of Intel Fortran
mega.sln
mega.suo
mega.u2d
mega.vfproj
mega-driver.for  Source file
mega.for       Source file
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: fission gas release, grain-bubble gas, uranium dioxide.