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Nakajima, Norihiro; Nishida, Akemi; Kawakami, Yoshiaki; Okada, Tatsuo*; Tsuruta, Osamu*; Sawa, Kazuhiro; Iigaki, Kazuhiko
Proceedings of 22nd International Conference on Nuclear Engineering (ICONE-22) (DVD-ROM), 9 Pages, 2014/07
Almost all industrial products are assembled from multiple parts. A nuclear facility is a large structure consisting of more than 10 million components. This paper discusses a method to analyze an assembly by gathering data on its component parts. Gathered data on component may identify ill conditioned meshes for connecting surfaces between components. These ill meshes are typified by nodal point disagreement in finite element discretization. A technique to resolve inconsistencies in data among the components is developed. By using this technique, structural analysis for an assembly can be carried out, and results can be obtained by the use of supercomputers, such as the K computer. Numerical results are discussed for components of the High Temperature Engineering Test Reactor.
Nakajima, Norihiro; Nishida, Akemi; Kawakami, Yoshiaki; Okada, Tatsuo; Tsuruta, Osamu; Sawa, Kazuhiro; Iigaki, Kazuhiko
Tabo Kikai, 42(5), p.332 - 338, 2014/05
K computer is one of the highest performance computers in the world. This paper discusses one of R&D issues in K computer national project. Industrial products are an artifact, which are assembly consisting of simple components more than at least two regardless of the big products and small products. In the nuclear industry, the facilities are large structures consisting of over 10 millions of components, since they are engaged with the highest technology and for safety sake. This paper introduces a method to analyze an assembly by gathering its components data. In the manner of gathering components data, it is raised many issues to concern among components. It is developed a technique to solve the inconsistent data among the components. By using this technique, a structural analysis for an assembly is done by using K computer. Numerical results are presented in the case of analysis for High Temperature engineering Test Reactor's components.
I deposition on the ground by airborne surveys at an early stage after the Fukushima Daiichi Nuclear Power Plant accidentTorii, Tatsuo; Sugita, Takeshi*; Okada, C. E.*; Reed, M. S.*; Blumenthal, D. J.*
Health Physics, 105(2), p.192 - 200, 2013/08
Times Cited Count：49 Percentile：96.53(Environmental Sciences)In March 2011 the second largest accidental release of radioactivity in history occurred at the Fukushima Daiichi Nuclear Power Plant following a magnitude 9.0 earthquake and subsequent tsunami. Teams from the US Department of Energy National Nuclear Security Administration Office of Emergency Response performed aerial surveys to provide initial maps of the dispersal of radioactive material in Japan. The initial results from the surveys did not report the concentration of iodine-131 (I). This work reports on analyses performed on the initial survey data by a joint Japan-US collaboration to determine I ground concentration. As a result of this analysis, although the analytical results show a high concentration of I northwest of the NPP, consistent with the previously reported radioactive cesium (
Cs and 
Cs) deposition, the I deposition shows a significant concentration south of the plant which is not represented in the radioactive cesium map.
Nishida, Akemi; Suzuki, Yoshio; Kawakami, Yoshiaki; Okada, Tatsuo; Nakajima, Norihiro
no journal, ,
A technique for their connection between parts in structural analysis method for assembly is introduced. The connection is carried out in both topologically and geometrically operation by using graph theory and rational B-spline interpolation. The smoothing of finite elements is proceed by the Laplacian operation for edges, area and vertex replacement.
Torii, Tatsuo; Sugita, Takeshi*; Okada, C.*; Reed, M. S.*; Blumenthal, D. J.*
no journal, ,
no abstracts in English
Nakajima, Norihiro; Nishida, Akemi; Kawakami, Yoshiaki; Okada, Tatsuo; Tsuruta, Osamu; Suzuki, Yoshio
no journal, ,
In a finite-element analysis for the assembling structure such as nuclear power generation facilities, a technique to promote efficiency of data making including the automatic finite element generation has been researched and developed because the input data became enormous. This report discusses a technique to analyze an assembly by accumulating components' data, which are discretized report.
Nakajima, Norihiro; Nishida, Akemi; Okada, Tatsuo; Kawakami, Yoshiaki; Tsuruta, Osamu
no journal, ,
The input data are complicated when a finite-element structural analysis is carried out for the assembly such as nuclear related facilities. A technique for the modelling assembling parts is suggested and experimented. In this report, finite element discretization was done by every parts by parts and performed an eigenvalue analysis for an assembly. The analysis approach was experimented by using the finite-element analysis for the assembly for a continuum models and an assembly.
-ray emitters including Cs, 1; Collaborative experiment by the committee on preparation of reference materials for radioactivity analysis of JSACYonezawa, Chushiro*; Kakita, Kazutoshi*; Takahashi, Takanori*; Aono, Tatsuo*; Maeda, Satoshi; Abe, Takaaki*; Arakawa, Fumihiro*; Kiho, Nobuharu*; Akiyama, Masakazu*; Muramatsu, Isamu*; et al.
no journal, ,
no abstracts in English
