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Sakamoto, Kensaku; Kobayashi, Seiji*
JAEA-Testing 2009-001, 32 Pages, 2009/07
Recently, the number of scientific and engineering calculations is increasing. It is said that GPUs (Graphic Processing Units) have much higher peak floating-point processing power and memory bandwidth than CPUs (Central Processing Units). We have studied the effectiveness of GPUs by applying them to fundamental scientific and engineering calculations with CUDA (Compute Unified Device Architecture) development tools. The results have shown as follow; (1) GPGPU (General-Purpose computations on GPUs) is effective for such calculations as matrix operation, FFT (Fast Fourier Transform) and CFD (Computational Fluid Dynamics) in nuclear research region. (2) Highly-advanced programming is required for bringing out high performance of GPUs and double-precision. (3) ECC (Error Correction Code) in graphic memory systems supports are inadequate.
Kondo, Makoto; Iigaki, Kazuhiko; Motegi, Toshihiro; Emori, Koichi
JAEA-Testing 2009-002, 50 Pages, 2009/08
High Temperature engineering Test Reactor (HTTR) is a test reactor that build on sand layer formed during quaternary era. In principle, nuclear power generation facilities need to be supported on rigid rock formed during tertiary era, and now it is investigated to construct nuclear power generation facilities on sand layer formed during quaternary era for expanding suitable location. For this reason, we installed seismic observation systems in HTTR. And we have performed seismic safety evacuation using measured seismic acceleration in ground and building. This report compiles specifications of seismic observation systems, contents of check for seismic observation systems, check result of seismic observation systems and maintenance of seismic observation systems in HTTR.
Aosai, Daisuke; Yoshida, Haruo*; Mizuno, Takashi
JAEA-Testing 2009-003, 27 Pages, 2009/10
In this report, we summarize filtration techniques developed and employed at the Underground Research Laboratory. The methods are useful for the physical and chemical characterization of minute particles in contaminated groundwater (including organic and inorganic particles, microbes, etc.), which can effect migration behavior. It is also useful for investigating the adsorption and complexation of particles and elements in groundwater. We performed the filtration of groundwater on site while maintaining in situ pressure and anaerobic conditions and in the laboratory under controlled anaerobic conditions. The results indicate the viability of groundwater filtration under in situ geochemical conditions, if the filtration is performed at controlled pressure and anaerobic conditions and with strict quality control. However, sample contamination occurs if stainless steel equipment is used. Therefore, to avoid contamination, we intend to develop Teflon equipment.
Ishikawa, Koji*; Inaba, Yoshitomo; Tsuchiya, Kunihiko
JAEA-Testing 2009-004, 16 Pages, 2010/02
In the solution irradiation method, which is proposed as new Mo production method, the molybdate solution of an irradiation target flows in a capsule. However, the compatibility between the flowing aqueous molybdate solution and the structural materials of capsules and pipes was not clear. Therefore, test apparatuses for the investigation of the compatibility were designed and fabricated. Preliminary tests with the test apparatuses were also carried out, and it was confirmed that planed tests could be carried out.
Hirayama, Takashi; Morishima, Soichi*; Yoshioka, Yuji*
JAEA-Testing 2009-005, 45 Pages, 2010/02
In the Japan Atomic Energy Agency Naka Fusion Institute, a lot of experiments have been conducted by using the large tokamak device JT-60 aiming to realize fusion power plant. In order to optimize the JT-60 experiment and to investigate complex characteristics of plasma, JT-60 experimental data analysis system was developed and used for collecting, referring and analyzing the JT-60 experimental data. Main components of the system are a data analysis server and a database server for the analyses and accumulation of the experimental data respectively. Other peripheral devices of the system are magnetic disk units, NAS (Network Attached Storage) device, and a backup tape drive. This is a user's manual of the JT-60 experimental data analysis system.
Iwamatsu, Shigemi; Kanazawa, Yoshiharu; Hayashi, Koji; Sozawa, Shizuo; Nakagawa, Tetsuya
JAEA-Testing 2009-006, 17 Pages, 2010/03
This report is concerned with replacement of the power manipulator in the No.2 concrete cell of JMTR Hot Laboratory in the 2008 fiscal year. It was carried out the replacement of power manipulator mainly on a chassis part including the remarkably aged wrist, shoulder and controller. The specifications of the machinery to be replaced, the installation and the acceptance inspection were described.
Ito, Masayasu; Kawamata, Kazuo; Ishitsuka, Etsuo
JAEA-Testing 2009-007, 16 Pages, 2010/03
Surface state of material is measured by the surface displacement measurement device with laser displacement sensor. It is important to know the characteristic of a device that considers environment to use this device in the cell. Therefore, this report described about evaluation of characteristics of the device by laser method.
Kato, Yoshiaki; Takada, Fumiki; Sozawa, Shizuo; Nakagawa, Tetsuya
JAEA-Testing 2009-008, 29 Pages, 2010/03
This report summarizes about the new equipment for the microstructural observation on the nuclear materials such as the structural material of light water reactor, which was installed in the JMTR Hot Laboratory. This experimental device, one of the PIE apparatuses, is useful to obtain the technical knowledge on the material degradation behavior by neutron irradiation damage and accumulate the data base for the integrity evaluation of nuclear power plant.
Okura, Takehisa; Oishi, Tetsuya; Moriyama, Hirobumi; Miyagawa, Naoto
JAEA-Testing 2009-009, 46 Pages, 2010/03
The meteorological observation at Tokai site has conducted based on a "Guideline of meteorological statistics for the safety analysis of nuclear power reactor" (Nuclear Safety Commission on January 28, 1982; revised on March 29, 2001) at Nuclear Science Research Institute in JAEA. The meteorological field was changed in 2005. This report shows assessments of the effect on the change of the meteorological field on April 2005.
Kitagishi, Shigeru; Inoue, Shuichi; Saito, Takashi; Omi, Masao; Tsuchiya, Kunihiko
JAEA-Testing 2009-010, 14 Pages, 2010/02
It is important for neutron irradiation tests of materials and fuels to clarify the irradiation environment. Especially, the oxygen and hydrogen peroxide concentrations are required to measure for the analysis of corrosion mechanism of the structure materials in the light-Water Reactor (LWR) conditions. In this report, the trial fabrication tests of the ceramic gas sensor were carried out by the Spark Plasma Sintering (SPS) method and basic performance results of the sensor were described.