Solution of large underestimation problem in the Monte Carlo calculation with hard biasing; In case with geometry input data created by CAD/MCNP automatic converter

Iida, Hiromasa; Kawasaki, Nobuo*; Konno, Chikara; Sato, Satoshi; Seki, Akiyuki

JAEA-Research 2008-050, 26 Pages, 2008/04

JAEA-Research-2008-050.pdf:1.98MB

An inconvenient experience was encountered, in which we have different answers depending on applied weight window values, in the nuclear analysis of the benchmark problem for CAD/MCNP interface programs, being developed under the ITER R&D task. Biasing can enhance calculation speed, but should not give different answers. Mechanism of this large underestimation is clarified. It is caused by the combination of the following two facts; (1) When one of particles in a history has got lost, MCNP cancels all tallies calculated during the history and all banked particles are thrown away (never tracked). (2) When we have distributed micro geometry errors in input data, important histories, which give significant contribution to tallies, will have many splitting and have "lost particle" with higher probability in the case of hard biasing. These two facts lead to selective canceling of important histories. An attempt to eliminate this inconvenience has been made, by modifying the subroutine "hstory" of MCNP. The modification has been done very successfully and eliminated the large underestimation, giving the same answer independently from applied weight window values.

Vectorization, parallelization and porting of nuclear codes; 2001

Akiyama, Mitsunaga*; Katakura, Fumishige*; Kawasaki, Nobuo*; Nemoto, Toshiyuki*; Tsuruoka, Takuya*; Adachi, Masaaki*; Ishizuki, Shigeru*; Kume, Etsuo

JAERI-Data/Code 2003-009, 307 Pages, 2003/07

JAERI-Data-Code-2003-009.pdf:10.37MB

Several computer codes in the nuclear field have been vectorized, parallelized and transported on the supar computer system at Center for Promotion of Computational Science and Engineering in Japan Atomic Energy Research Institute. We dealt with 10 codes in fiscal 2001. In this report, the parallelization of Newtron Radiography for 3 dimensional CT code NR3DCT, the vectorization of Unsteady-state heat conduction code THERMO3D, the porting of initial program of MHD simulation, the tuning of Heat And Mass Balance Analysis Code HAMBAC, the porting and parallelization of Monte Carlo N-Particle transport code MCNP4C3, the porting and parallelization of Monte Carlo N-Particle Transport code system MCNPX2.1.5, the porting of code CINAC-V4, the porting of Assisted Model Building with Energy Refinement Amber5 code system, the part of additional VisLink library Multidimensional Two-fluid model code ACD3D and the porting of experiment data processing code for GS8500 to SR8000 are described.

Vectorization, parallelization and porting of nuclear codes (vectorization and parallelization); Progress report fiscal 1999

Adachi, Masaaki*; Ishizuki, Shigeru*; Ogasawara, Shinobu*; Kume, Etsuo; Yatake, Yoichi*; Nemoto, Toshiyuki*; Kawasaki, Nobuo*; Kawai, Wataru*

JAERI-Data/Code 2000-043, 220 Pages, 2001/02

JAERI-Data-Code-2000-043.pdf:7.39MB

no abstracts in English

Vectorization, parallelization and porting of nuclear codes (Parallelization on scalar processors); Progress report fiscal 1999

Yatake, Yoichi*; Kume, Etsuo; Kawai, Wataru*; Nemoto, Toshiyuki*; Kawasaki, Nobuo*; Adachi, Masaaki*; Ishizuki, Shigeru*; Ogasawara, Shinobu*

JAERI-Data/Code 2000-038, 57 Pages, 2000/12

JAERI-Data-Code-2000-038.pdf:2.3MB

no abstracts in English

Vectorization, parallelization and porting of nuclear codes (Porting); Progress report fiscal 1998

Nemoto, Toshiyuki*; Kawasaki, Nobuo*; Kume, Etsuo; Kawai, Wataru*; Adachi, Masaaki*; Ishizuki, Shigeru*; Yatake, Yoichi*; Ogasawara, Shinobu*

JAERI-Data/Code 2000-017, p.99 - 0, 2000/03

JAERI-Data-Code-2000-017.pdf:3.31MB

no abstracts in English

Development of automatic editing system for MCNP library "autonj"

Maekawa, Fujio; Sakurai, Kiyoshi; Kosako, Kazuaki*; Kume, Etsuo; Kawasaki, Nobuo*; Nomura, Yasushi; Naito, Yoshitaka*

JAERI-Data/Code 99-048, p.52 - 0, 1999/12

JAERI-Data-Code-99-048.pdf:2.34MB

no abstracts in English

Vectorization, parallelization and porting of nuclear codes on the VPP500 system (Vectorization); Progress report fiscal 1997

*; *; *; *; *; Ogasawara, Shinobu*; Adachi, Masaaki*; *; Kume, Etsuo

JAERI-Data/Code 99-026, 91 Pages, 1999/05

JAERI-Data-Code-99-026.pdf:2.9MB

no abstracts in English

Vectorization, parallelization and porting of nuclear codes on the VPP500 system, porting; Progress report fiscal 1996

*; *; *; *; *; *; Harada, Hiro; ; Kume, Etsuo;

JAERI-Data/Code 97-055, 161 Pages, 1998/01

JAERI-Data-Code-97-055.pdf:4.57MB

no abstracts in English

Vectorization, parallelization and porting of nuclear codes on the VPP500 system (vectorization); Progress report fiscal 1996

*; *; *; *; *; *; Harada, Hiro; ; Kume, Etsuo;

JAERI-Data/Code 97-051, 142 Pages, 1997/12

JAERI-Data-Code-97-051.pdf:3.91MB

no abstracts in English

Solution of large underestimation problem in the Monte Carlo calculation with hard biasing

Iida, Hiromasa; Kawasaki, Nobuo*; Konno, Chikara; Sato, Satoshi; Seki, Akiyuki

no journal, , 

no abstracts in English