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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.
Toyama, Shigeyuki*; Wakamatsu, Hisanori;
JNC TJ7440 2000-026, 910 Pages, 2000/08
JNC-TJ7440-2000-026.pdf:57.27MB
no abstracts in English
Toyama, Shigeyuki*; Wakamatsu, Hisanori; Okazaki, Hikoya
JNC TJ7440 2000-020, 21 Pages, 2000/03
JNC-TJ7440-2000-020.pdf:5.83MB
no abstracts in English
Toyama, Shigeyuki*; Wakamatsu, Hisanori; Okazaki, Hikoya
JNC TJ7440 2000-019, 17 Pages, 2000/03
JNC-TJ7440-2000-019.pdf:1.95MB
no abstracts in English
Toyama, Shigeyuki*; Wakamatsu, Hisanori; Okazaki, Hikoya
JNC TJ7440 2000-018, 55 Pages, 2000/03
JNC-TJ7440-2000-018.pdf:9.57MB
no abstracts in English
Toyama, Shigeyuki*; Wakamatsu, Hisanori; Okazaki, Hikoya
JNC TJ7440 99-031, 22 Pages, 1999/09
no abstracts in English
Toyama, Shigeyuki*; Wakamatsu, Hisanori; Okazaki, Hikoya
JNC TJ7440 99-020, 27 Pages, 1999/05
no abstracts in English
Yamanoi, Tadayo*; Wakamatsu, Hisanori; *;
JNC TJ7440 2000-001, 81 Pages, 1998/03
JNC-TJ7440-2000-001.pdf:10.42MB
no abstracts in English
Yamanoi, Tadayo*; Wakamatsu, Hisanori; *;
JNC TJ7440 2000-027, 140 Pages, 1997/10
JNC-TJ7440-2000-027.pdf:11.76MB
no abstracts in English
Yamanoi, Tadayo*; Sunami, Motoaki*; Wakamatsu, Hisanori; Okazaki, Hikoya; Takato, Toshikazu*
JNC TJ7440 2001-005, 272 Pages, 1996/03
JNC-TJ7440-2001-005.pdf:10.5MB
no abstracts in English
Yamanoi, Tadayo*; Goda, Toshiyuki*; Wakamatsu, Hisanori; Okazaki, Hikoya; Kambara, Masatoshi*
JNC TJ7440 2001-004, 258 Pages, 1995/03
JNC-TJ7440-2001-004.pdf:42.12MB
None
Nakano, Katsushi; Seo, Toshihiro; ; ; Ogata, Nobuhisa; Wakamatsu, Hisanori; Yanagizawa, Koichi
PNC TN7510 92-007, 27 Pages, 1992/07
None
Yanagizawa, Koichi; Imai, Hisashi; ; Wakamatsu, Hisanori; Umeda, Koji
PNC TN7410 92-019, 68 Pages, 1992/07
Groundwater flow was analysed in the two areas of different scale situated in central Japan, in order to estimate hydrological condition existing at the deep underground in Japan. For the analysis in the Central Japan area (300 
500km 10km deep), a hydrogeological model (a model expressing distribution of hydraulic conductivity) was built up with data from literature published so far. The model in the Tono area (8 7km 3km deep) which is a part of the Central Japan area, a hydrogeological model was built up with field data from the area studied. Based on these models, steady state three-dimensional groundwater flow under a saturated-unsaturated condition was calculated by means of FEM. The results are as follows: (1)In the Central Japan area, distribution of piezometric head harmonizes with topography in the area. (2)In the Tono area, distribution of piezometric head in the sub-surface part is governed by local topography, while that in the deeper part is governed by underlying regional topography. (3)In both areas, vertical variation of piezometric head is rather small without the shallow part, which indicates hydrostatic distribution. (4)Hydraulic gradient is less than 0.04 in the most part below GL-500m in both areas. (5)The results of the analysis in the Central Japan area show that types of distribution of hydraulic conductivity below EL-3,000m, of relationship between saturation ratio and pressure head, and of lateral boundary condition, do not remarkably affect the flow situation.
Yanagizawa, Koichi; ; Osawa, Hideaki; Wakamatsu, Hisanori; Umeda, Koji
PNC TN7410 92-015, 67 Pages, 1992/06
This report deals with the permeability of rock mass from the ground surface to 1,000 m deep in Japan. The purpose of this study is to obtain the fundamental data in order to analyse groundwater behavior. 552 data of permeability are collected from 18 kinds of technical papers. These data, which are mostly obtained by in-situ test, are analysed from the viewpoint of rock types (granitic rocks, gabbroic rocks, rhyolitic rocks, basaltic rocks, Neogene sedimentary rocks, Pre-Neogene sedimentary rocks, limestone, metamorphic rocks, Quaternary sediments, Quaternary volcanic rocks), depth and location. From this study, it is found that the permeability of rock mass in Japan are in the order of 10
cm/sec to 10
cm/sec. The mean hydraulic conductivity is on the order of 10
cm/sec in limestone, 10
cm/sec in Quaternary deposite, and 10
cm/sec in the other kind of rocks. Hereafter wider collection of data and analyses are recommended for the comprehensive evaluation of rock permeability in Japan.
Murata, Masatoshi*; Yasuno, Masamitsu*; Wakamatsu, Hisanori; *;
JNC TJ7440 2000-029, 158 Pages, 1991/07
JNC-TJ7440-2000-029.pdf:7.15MB
no abstracts in English
Yoshimura, Kimitaka*; Wakamatsu, Hisanori*; Ando, Kenichi*; Hashimoto, Shuji*; Yabuuchi, Satoshi; Shigeta, Naotaka
no journal, ,
no abstracts in English
Nagasawa, Hirokazu; Takeda, Seiji; Kimura, Hideo; Sakai, Ryutaro; Shiozaki, Isao*; Yamashita, Ryo*; Wakamatsu, Hisanori*; Ishibashi, Kazufusa*
no journal, ,
no abstracts in English