GEOMIT is the CAD/MCNP conversion interface code. The old version of GEOMIT had a limited capability from CAD model handling point of view. It is developed to automatically generate Monte Carlo geometrical data from CAD data due to the difference in the representation scheme. GEOMIT is capable of importing different CAD format as well as exporting different CAD format. GEOMIT has a capability to produce solid cells as well as void cells without using complement operator. While loading the CAD shapes (Solids), each shape is assigning material number and density according to its color. Shape fixing process is been applied to cure the errors in the CAD data. Vertices location correctness is evaluated first, then a removal of free edges and removal of small faces processes. Binary Space Portioning (BSP) tree technique is used to automatically split complicated solids into simpler cells to avoid excessive complicated cells for MCNP to run faster. MCNP surfaces are subjected to an automatic reduction before creating the model. CAD data of International Thermonuclear Experimental Reactor (ITER) benchmark model has been converted successfully to MCNP geometrical input. The first wall heat loading calculations agree very well with other countries results.
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17th International Conference on Nuclear Engineering
July 12–16, 2009
Brussels, Belgium
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-4352-9
PROCEEDINGS PAPER
Development of the CAD/MCNP Automatic Conversion Code GEOMIT
Hesham R. Nasif,
Hesham R. Nasif
Computer Software Development Ltd., Tokyo, Japan
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Fukuzo Masuda,
Fukuzo Masuda
Computer Software Development Ltd., Tokyo, Japan
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Hiromasa Iida,
Hiromasa Iida
Computer Software Development Ltd., Tokyo, Japan
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Hidetsugu Morota,
Hidetsugu Morota
Computer Software Development Ltd., Tokyo, Japan
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Satoshi Sato,
Satoshi Sato
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
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Chikara Konno
Chikara Konno
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
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Hesham R. Nasif
Computer Software Development Ltd., Tokyo, Japan
Fukuzo Masuda
Computer Software Development Ltd., Tokyo, Japan
Hiromasa Iida
Computer Software Development Ltd., Tokyo, Japan
Hidetsugu Morota
Computer Software Development Ltd., Tokyo, Japan
Satoshi Sato
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
Chikara Konno
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
Paper No:
ICONE17-75229, pp. 807-814; 8 pages
Published Online:
February 25, 2010
Citation
Nasif, HR, Masuda, F, Iida, H, Morota, H, Sato, S, & Konno, C. "Development of the CAD/MCNP Automatic Conversion Code GEOMIT." Proceedings of the 17th International Conference on Nuclear Engineering. Volume 2: Structural Integrity; Safety and Security; Advanced Applications of Nuclear Technology; Balance of Plant for Nuclear Applications. Brussels, Belgium. July 12–16, 2009. pp. 807-814. ASME. https://doi.org/10.1115/ICONE17-75229
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