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Sato, Satoshi; Ochiai, Kentaro; Konno, Chikara; Morota, Hidetsugu*; Nasif, H.*; Tanaka, Masanobu*; Polunovskiy, E.*; Loughlin, M.*
Proceedings of 24th IAEA Fusion Energy Conference (FEC 2012) (CD-ROM), 8 Pages, 2013/03
Detailed nuclear analyses for the latest ITER NB system are required to ensure that NB design conforms to the nuclear regulations for the ITER building and licensing. A variety of nuclear analyses was started for ITER NB system including a tokamak building of 50m 
35m 20m and outside the building by using a Monte Carlo code MCNP in 2009. MCNP geometry input data were successfully produced from simplified NB CAD data with the improved GEOMIT code, which automatically converts CAD data to MCNP geometry input data. We have performed calculations of the effective dose rates during DT operation and after shutdown, and activation of the NB components, etc.
Nasif, H. R.*; Masuda, Fukuzo*; Morota, Hidetsugu*; Iida, Hiromasa*; Sato, Satoshi; Konno, Chikara
Nuclear Technology, 180(1), p.89 - 102, 2012/10
Times Cited Count：5 Percentile：36.18(Nuclear Science & Technology)GEOMIT is the CAD/MCNP conversion interface code. 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 on the original CAD data. 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. MCNP input model validations have been carried out by checking lost particles and comparing volumes calculated by MCNP to those of the original CAD data. Different test cases have been evaluated for the ITER, include Blanket first wall heat loading calculations, surface fluxes and volume fluxes at different divertor regions as well as TF coils heating.
Shaaban, N.*; Masuda, Fukuzo*; Nasif, H.*; Yamada, Masao*; Sawamura, Hidenori*; Morota, Hidetsugu*; Sato, Satoshi; Iida, Hiromasa; Nishitani, Takeo
Proceedings of 14th International Conference on Nuclear Engineering (ICONE-14) (CD-ROM), 7 Pages, 2006/07
no abstracts in English
Nasif, H.*; Umeki, Hiroyuki
JNC TN1400 2001-009, 69 Pages, 2001/06
JNC-TN1400-2001-009.pdf:2.23MB
no abstracts in English
Nasif, H.*; Masuda, Fukuzo*; Noha, S.*; Yamada, Masao*; Morota, Hidetsugu*; Iida, Hiromasa; Sato, Satoshi; Konno, Chikara; Nishitani, Takeo
no journal, ,
GEOMIT is the CAD/MCNP conversion interface code. It is developed to automatically generate MCNP surface and cell cards from CAD data. GEOMIT uses sequential query language (SQL) to store the CAD data in the form of database tables to minimize the memory usage during the conversion processes. GEOMIT has a capability to produce void cells as well as solid cells without using complement operator. CAD data of International Thermonuclear Experimental Reactor (ITER) benchmark model has been converted successfully to MCNP geometrical input. The first wall neutron loading calculations agree very well with other countries results.
Nasif, H.*; Morota, Hidetsugu*; Sukegawa, Atsuhiko
no journal, ,
ATTILA is the 3D multi-group Sn particle transport code with arbitrary order anisotropic scattering. The transport equation solves in first order form using a tri-linear discontinuous spatial differencing on an arbitrary tetrahedral mesh. The key benefits are that as approximate accurate as Monte Carlo code, but mach faster and most useful visual and quantitative pre/post processing, etc. This presentation is to set out a radiation shielding analysis for the JT-60. ATTILA has shown its successful applicability with JT-60 machine disregarding its complex geometry for fully 360-degree model in the near future.
Sato, Satoshi; Ochiai, Kentaro; Konno, Chikara; Iida, Hiromasa*; Morota, Hidetsugu*; Nasif, H.*; Tanaka, Masanobu*
no journal, ,
Shielding analyse were conducted on ITER NB by Monte Carlo calculation code MCNP5 and Fusion Evaluated Nuclear Data Library FENDL-2.1. Neutron and 
-ray dose rate distributions during operation are evaluated in L2 and L3 room. Also, these are evaluated outside the building. By using the direct 1 step Monte Carlo method (D1S-MCNP), decay -ray dose rate distributions are evaluated in L2 and L3 room about 10 days after operation. Detailed calculation results are presented in this conference.
Morota, Hidetsugu*; Yamada, Masao*; Nasif, H.*; Masuda, Fukuzo*; Iida, Hiromasa; Sato, Satoshi; Nishitani, Takeo; Tamamizu, Shigeyuki*; Karaki, Junichi*
no journal, ,
Development of CAD preprocessing tool "CrtVoid" is reported. The code extracts surface element information and re-arrange them as input data for CAD/MCNP automatic conversion cord "GEOMIT". Reports includes detail of the development and test results of confirmation of its functions.
Iida, Hiromasa; Sato, Satoshi; Konno, Chikara; Nishitani, Takeo; Nasif, H.*; Masuda, Fukuzo*; Yamada, Masao*; Morota, Hidetsugu*
no journal, ,
The ITER benchmark problem has been analysed with a CAD/MCNP automatic conversion cord "GEOMIT" which is beeing developed by JAEA-FNS in cooperation with CSD. The analysis includes (1) First wall neutron load, (2) Neutron fluxes in divertor cassette (3) Inboard TF coil nuclear heat and (4) Neutron flux distribution behind the port plug rear in a equitorial port. Generally very similar results have been obtained by GEOMIT with those of other ITER participating parties, suggesting that development of GEOMIT is progressing smoothly.
