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Kaji, Yoshiyuki; Miwa, Yukio; Tsukada, Takashi; Hayakawa, Masao*; Nagashima, Nobuo*; Matsuoka, Saburo*
JAERI-Research 2005-029, 156 Pages, 2005/09
JAERI-Research-2005-029.pdf:57.24MB
This report describes a result of the research conducted under contract with JNES that was concerned with a multi-scale analysis of plastic deformation behavior at the crack tip of SCC. The research was carried out to evaluate the validity of the SCC growth data acquired in the IGSCC project based on a mechanistic understanding of SCC. For the purpose, in this research, analyses of the plastic deformation behavior and microstructure around the crack tip were performed in a nano-order scale. The hardness measured in nano, meso and macro scales was employed as a common index of the strength, and the essential data necessary to understand the SCC propagation behavior were acquired and analyzed that are mainly a size of plastic deformation region and a microstructural information in the region, e.g. data of crystallografy, microscopic deformation and dislocations at the inside of grains and grain boundaries.
Kurata, Masaki
no journal, ,
Outline of METI project on Advanced multi-scale modeling and experimental study for fuel degradation in severe accident is introduced as plenary lecture of NuMat 2014. Individual models, databases and test facilities developed in the project are introduced.
Ota, Yukihiro; Machida, Masahiko; Koyama, Tomio*; Matsumoto, Hideki*
no journal, ,
Observing the teraherz radiation emission from Bi
SrCaCuO
leads to a number of the experimental and theoretical studies of revealing the mechanism of the behaviors in superconducting engineering. We develop a large-scale simulation approach for the teraherz emission from intrinsic Josephson junction stacks with multiple spatial scales. We focus on the effects of the number of the junctions in the system, which is considered to be a key ingredient of determining the emission-power bound. Our simulation method successfully predicts the amplification of the emission peaks corresponding to the fundamental mode, i.e., a primary contribution in low-current-biased region.
Ota, Yukihiro; Machida, Masahiko
no journal, ,
Since the observation of teraherz emission from mesas made of layered high-Tc superconductor Bi
SrCaCuO
, the mechanism of radiation attracts a great deal of attention from theoretical and engineering points of view. Emission has a connection with the dynamical aspects of superconducting phases and electromagnetic wave; constructing a theoretical approach to integrating these degrees of freedom is desirable. A way to resolving the issues is built up by 3D dynamical simulations of intrinsic Josephson junction stacks with outside-vacuum contributions. In this article, we apply our code to characterizing teraherz emission in low-bias-current regions. The highlight is to achieve the change of the junction numbers involved the sample. We successfully reproduce the emergence of 
-kink behaviors. Then, we show the presence of a critical value of the number of junctions for a strong emission.
Yagi, Masatoshi; Seto, Haruki; Cho, Y. W.*; Hahm, T. S*
no journal, ,
no abstracts in English
Tanaka, Masaaki; Hiyama, Tomoyuki; Murakami, Satoshi*; Doda, Norihiro; Ohshima, Hiroyuki
no journal, ,
In order to improve the accuracy of the numerical estimation method for the thermal transient phenomena in the sodium-cooled fast reactor has been conducted by using code coupling technology with the system analysis code for plant dynamics analysis, the multi-dimensional code for analysis of thermal-hydraulics in the plenum, and numerical estimation code of structural integrity for the local region, in viewpoint of enhancement of safety measures in sodium-cooled fast reactor. In this presentation, outline of simulation method development is introduced.