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Takase, Hiroyasu*; Inagaki, Manabu*; Noguchi, Toshihide*; Shimaoka, Akiko*; Martin, A. J.*; Wakamatsu, Hisanori*; Takase, Kyoko*; Tabara, Michiko*; Matsui, Hiroya
JAEA-Research 2007-066, 215 Pages, 2007/08
JAEA-Research-2007-066-01.pdf:43.05MBJAEA-Research-2007-066-02.pdf:58.73MBJAEA-Research-2007-066-03.pdf:13.08MB
In this study a systematic approach to explicitly address type and size of uncertainties associated with safety assessment due mainly to incomplete knowledge on a spatially heterogeneous geological environment was developed. In this approach a wide range of model variations including the ones with relatively law plausibility are taken into account so that ambiguity remaining in the knowledge is illustrated, which is a distinctive feature of the approach compared with the conventional methodology where only a limited number of best plausible model variations are considered. The study also proposed an approach to assessing plausibility of each model variation based on multiple pieces of evidence by using evidential support logic (ESL). Furthermore the approach was applied to Horonobe area to demonstrate its applicability to the similar class of geological environment as an example.
Takase, Hiroyasu*; Noguchi, Toshihide*; Wakamatsu, Hisanori*; Martin, A. J.*; Yamada, Kazuhiro*; Takase, Kyoko*; Tabara, Michiko*
JNC TJ5400 2005-001, 200 Pages, 2005/03
JNC-TJ5400-2005-001.pdf:57.24MB
In the Horonobe deep geological formation research plan, in order to improve confidence in disposal technology and safety assessment methods, research is being done connected with disposal technology and safty assessment. This research concerns the geological environmental acquired during investigations from the surface to the deep sub-surface and the geological model constructed using these data.Inthe current study groundwater flow and mass transport analysis have been conducted taking into account uncertainties associated with the coceptual model for geological environment in Horonobe area that was constructed by using data acquired during the investigation from ground surface. In addition a number of scoping calculations were made to support planning of the in-situ experiments.
Okutsu, Kazuo*; Morikawa, Seiji*; Shimbo, Hiroshi*; Kuroyanagi, Mikio*; Sahara, Fumihiro*; Murakami, Takeshi*; Aoyama, Yuji*
JNC TJ8400 2005-013, 117 Pages, 2005/02
JNC-TJ8400-2005-013.pdf:3.24MB
To integrate the system for evaluation of long-term hydraulic condition in near field of TRU waste disposal, the engineered barrier, which consists of bentonite buffer and cementitious materials, was employed in the series of laboratory tests. On the bentonite buffer, with the aim of investigating of the effect of (i) interlayer cation in bentonite, (ii) content of siliceous sand and (iii) the ionic strength of ground water on its mechanical and hydraulic properties, series of laboratory tests were conducted. The same lot of bentonite was used in the series of tests to obtain consistent data. In addition, the swelling test of the laminated bentonite with caliumization front was conducted for verification of the proposed constitutive model. On cementitious materials, the altered specimen that produced immersing was investigated the water permeation and also characteristics. The hardened cement paste specimens with W/C=40 to 105% were immersed into deionized water and alteration behavior under diffusion condition was investigated.
Okutsu, Kazuo*; Morikawa, Seiji*; Shimbo, Hiroshi*; Kuroyanagi, Mikio*; Sahara, Fumihiro*; Murakami, Takeshi*; Aoyama, Yuji*
JNC TJ8400 2005-012, 272 Pages, 2005/02
JNC-TJ8400-2005-012.pdf:7.05MB
To integrate the system for evaluation of long-term hydraulic condition in near field of TRU waste disposal, the engineered barrier, which consists of bentonite buffer and cementitious materials, was employed in the series of laboratory tests.On the bentonite buffer, with the aim of investigating of the effect of (i)interlayer cation in bentonite, (ii)content of siliceous sand and (iii)the ionic strength of ground water on its mechanical and hydraulic properties, series of laboratory tests were conducted. The same lot of bentonite was used in the series of tests to obtain consistent data. In addition, the swelling test of the laminated bentonite with caliumization front was conducted for verification of the proposed constitutive model.On cementitious materials, the altered specimen that produced immersing was investigated the water permeation and also characteristics. The hardened cement paste specimens with W/C=40 to 105% were immersed into deionized water and alteration behavior under diffusion condition was investigated.
Okutsu, Kazuo*; Morikawa, Seiji*; Taguchi, Katsunori*; Kuroyanagi, Mikio*; Sahara, Fumihiro*; Takase, Hiroyasu*; Aoyama, Yuji*
JNC TJ8400 2003-087, 199 Pages, 2004/02
JNC-TJ8400-2003-087.pdf:4.82MB
The system development for evaluating the long-term alteration of hydraulic field in near field was examined. The "Evidential Support Logic" for ensuring the long-term stability of the repository was developed and evaluated. Furthermore, the developed chemical/mechanical alteration action analysis system was verified and improved. The system was coupled for the long-term alteration evaluation analysis.
Okutsu, Kazuo*; Morikawa, Seiji*; Taguchi, Katsunori*; Kuroyanagi, Mikio*; Sahara, Fumihiro*; Takase, Hiroyasu*; Aoyama, Yuji*
JNC TJ8400 2003-086, 426 Pages, 2004/02
JNC-TJ8400-2003-086.pdf:11.01MB
The system development for evaluating the long-term alteration of hydraulic field in near field was examined. The "Evidential Support Logic" for ensuring the long-term stability of the repository was developed and evaluated. Furthermore, the developed chemical/mechanical alteration analysis system was verified and improved. The system was coupled for the long-term alteration evaluation analysis.
Takase, Hiroyasu*; Metcalfe, R.*; Inagaki, Manabu*; Noguchi, Toshihide*; Aoyama, Yuji*; Takase, Kyoko*; Tabara, Michiko*
JNC TJ5400 2003-006, 264 Pages, 2004/02
JNC-TJ5400-2003-006(errata).pdf:0.08MBJNC-TJ5400-2003-006-1.pdf:83.88MBJNC-TJ5400-2003-006-2.pdf:15.97MB
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Aoyama, Yuji*; Takase, Hiroyasu*
JNC TJ8400 2003-001, 55 Pages, 2003/03
JNC-TJ8400-2003-001.pdf:1.52MB
A hydrodynamics analysis system for a precise crack model was developed using a cellular automata method and the applicability of the system was investigated. Since the Reynolds number of the target fluid is low, the lattice gas method, for which the computation cost is relatively small, was applied. As for the mesh, a four dimensional face-centered hyperbolic cube projecting onto the three dimensional space was used. The hydrodynamic and migration model was developed for the lattice gas method. The system was evaluated using Snow's law of hydrodynamics in a parallel plate. The system was also applied to a crack model based on LABROCK data. Several trial crack models were generated using fractal theory and the relationship between the configuration and hydrodynamics of a crack was investigated.
Okutsu, Kazuo*; Morikawa, Seiji*; Takamura, Hisashi*; Hane, Koji*; Tabei, Kazuto*; Sahara, Fumihiro*; Murakami, Takeshi*
JNC TJ8400 2003-050, 140 Pages, 2003/02
JNC-TJ8400-2003-050.pdf:3.13MB
The system development for evaluating long-term alteration of hydraulic field in Near Field was examined.
Okutsu, Kazuo*; Morikawa, Seiji*; Takamura, Hisashi*; Hane, Koji*; Tabei, Kazuto*; Sahara, Fumihiro*; Murakami, Takeshi*
JNC TJ8400 2003-049, 265 Pages, 2003/02
JNC-TJ8400-2003-049.pdf:7.88MB
The system development for evaluating long-term alteration of hydraulic field in Near Field was examined.