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Nagaya, Yasunobu; Okumura, Keisuke; Mori, Takamasa; Nakagawa, Masayuki
JAERI 1348, 388 Pages, 2005/06
To realize fast and accurate Monte Carlo simulation of neutron and photon transport problems, two vectorized Monte Carlo codes MVP and GMVP have been developed at JAERI. MVP is based on the continuous energy model and GMVP is on the multigroup model. Compared with conventional scalar codes, these codes achieve higher computation speed by a factor of 10 or more on vector supercomputers. Both codes have sufficient functions for production use by adopting accurate physics model, geometry description capability and variance reduction techniques. The first version of the codes was released in 1994. They have been extensively improved and new functions have been implemented. The major improvements and new functions are (1) capability to treat the scattering model expressed with File 6 of the ENDF-6 format, (2) time-dependent tallies, (3) reaction rate calculation with the pointwise response function, (4) flexible source specification, etc. This report describes the physical model, geometry description method used in the codes, new functions and how to use them.
Nagai, Haruyasu
JAERI-Data/Code 2003-021, 36 Pages, 2003/12
JAERI-Data-Code-2003-021.pdf:1.73MB
A new method to couple atmosphere and land-surface models using the massage passing interface (MPI) was proposed to develop a atmosphere-land model for studies on heat, water, and material exchanges at around the land surface. A non-hydrostatic atmospheric dynamic model of Pennsylvania State University and National Center for Atmospheric Research (PUS/NCAR-MM5) and a detailed land surface model (SOLVEG) including the surface-layer atmosphere, soil, and vegetation developed at Japan Atomic Energy Research Institute (JAERI) are used as the atmosphere and land-surface models, respectively. Concerning the MPI, a message passing library named Stampi developed at JAERI that can be used between different parallel computers is used. The models are coupled by exchanging calculation results by using MPI on their independent parallel calculations.
*; Kaji, Yoshiyuki; *; ; *; Kaburaki, Hideo
Keisan Kogaku Koenkai Rombunshu, 3(1), p.59 - 62, 1998/05
no abstracts in English
*; ; Yokokawa, Mitsuo
JAERI-Data/Code 96-013, 25 Pages, 1996/03
JAERI-Data-Code-96-013.pdf:1.04MB
no abstracts in English
*; Yokokawa, Mitsuo; Watanabe, Tadashi;
JAERI-Data/Code 96-008, 20 Pages, 1996/03
JAERI-Data-Code-96-008.pdf:1.1MB
no abstracts in English
; Masukawa, Fumihiro; Komuro, Yuichi; Naito, Yoshitaka; *; *; *; *
Nihon Genshiryoku Gakkai-Shi, 34(6), p.533 - 543, 1992/06
Times Cited Count：1 Percentile：17.24(Nuclear Science & Technology)no abstracts in English
Yokokawa, Mitsuo
Nihon Kikai Gakkai Rombunshu, B, 56(524), p.1062 - 1065, 1990/04
no abstracts in English
Miwa, Junichi*; Hino, Tetsushi*; Mitsuyasu, Takeshi*; Nagaya, Yasunobu
no journal, ,
We performed whole-core Monte Carlo calculations for core design verification of an innovative BWR concept, resource-renewable boiling water reactor (RBWR). The calculations include a coupled neutronics/thermal-hydraulics calculation with a continuous-energy Monte Carlo code MVP and an inhouse thermal-hydraulics code, and a burnup calculation with the MVP-BURN code. Such calculations for the RBWR is challenging because it requires a large memory size and a large amount of calculation time. The typical memory size required for the RBWR calculations was an order of 10 GBytes per CPU in parallel computing using a desktop PC cluster. The total calculation time for calculating the characteristics of the equilibrium core of RBWR with the whole-core Monte Carlo burnup calculation using the desktop PC cluster was about 20 days. We demonstrated that the design calculations for the RBWR were possible with such a desktop PC cluster.
