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Shibata, Masahiro; Sawada, Atsushi; Tachi, Yukio; Makino, Hitoshi; Wakasugi, Keiichiro; Mitsui, Seiichiro; Kitamura, Akira; Yoshikawa, Hideki; Oda, Chie; Ishidera, Takamitsu; et al.
JAEA-Research 2014-030, 457 Pages, 2015/03
JAEA and NUMO have conducted a collaborative research work which is designed to enhance the methodology of repository design and post-closure performance assessment in preliminary investigation stage. With regard to (1) study on rock suitability in terms of hydrology, based on some examples of developing method of hydro-geological structure model, acquired knowledge are arranged using the tree diagram, and model uncertainty and its influence on the evaluation items were discussed. With regard to (2) study on scenario development, the developed approach for "defining conditions" has been reevaluated and improved from practical viewpoints. In addition, the uncertainty evaluation for the effect of use of cementitious material, as well as glass dissolution model, was conducted with analytical evaluation. With regard to (3) study on setting radionuclide migration parameters, based on survey of precedent procedures, multiple-approach for distribution coefficient of rocks was established, and the adequacy of the approach was confirmed though its application to sedimentary rock and granitic rock. Besides, an approach for solubility setting was developed including the procedure of selection of solubility limiting solid phase. The adequacy of the approach was confirmed though its application to key radionuclides.
Shibata, Masahiro; Sawada, Atsushi; Tachi, Yukio; Hayano, Akira; Makino, Hitoshi; Wakasugi, Keiichiro; Mitsui, Seiichiro; Oda, Chie; Kitamura, Akira; Osawa, Hideaki; et al.
JAEA-Research 2013-037, 455 Pages, 2013/12
Following FY2011, JAEA and NUMO have conducted a collaborative research work which is designed to enhance the methodology of repository design and performance assessment in preliminary investigation stage. With regard to (1) study on rock suitability in terms of hydrology, the tree diagram of methodology of groundwater travel time has been extended for crystalline rock, in addition, tree diagram for sedimentary rock newly has been organized. With regard to (2) study on scenario development, the existing approach has been improved in terms of a practical task, and applied and tested for near field focusing on the buffer. In addition, the uncertainty of some important processes and its impact on safety functions are discussed though analysis. With regard to (3) study on setting radionuclide migration parameters, the approaches for parameter setting have been developed for sorption for rocks and solubility, and applied and tested through parameter setting exercises for key radionuclides.
Shibata, Masahiro; Sawada, Atsushi; Tachi, Yukio; Makino, Hitoshi; Hayano, Akira; Mitsui, Seiichiro; Taniguchi, Naoki; Oda, Chie; Kitamura, Akira; Osawa, Hideaki; et al.
JAEA-Research 2012-032, 298 Pages, 2012/09
JAEA and NUMO have conducted a collaborative research work which is designed to enhance the methodology of repository design and performance assessment in preliminary investigation phase. The topics and the conducted research are follows; (1) Study on selection of host rock: in terms of hydraulic properties, items for assessing rock property, and assessment methodology of groundwater travel time has been organized with interaction from site investigation. (2) Study on development of scenario: the existing approach has been embodied, in addition, the phenomenological understanding regarding dissolution of and nuclide release from vitrified waste, corrosion of the overpack, long-term performance of the buffer are summarized. (3) Study on setting nuclide migration parameters: the approach for parameter setting has been improved for sorption and diffusion coefficient of buffer/rock, and applied and tested for parameter setting of key radionuclides. (4) Study on ensuring quality of knowledge: framework for ensuring quality of knowledge has been studied and examined aimed at the likely disposal facility condition.
Goto, Junichi; Hama, Katsuhiro
JNC TN5510 2003-002, 18 Pages, 2003/10
The Horonobe Underground Research Laboratory Project is an investigation project which is planned over 20 years. The investigations are conducted in three phases: investigations from the surface (PhaseI), investigations during construction of the underground facility (Phases2) and investigations using the facility (Phase3). Taking into account the results from the Second Progress Report on Research and Development for the Geological Disposal of HLW in Japan, research and development goals for the Horonobe URL project were re-defined.
Kumazaki, Naoki; Koki, Ikeda; Goto, Junichi; Mukai, Kei; Iwatsuki, Teruki; Furue, Ryoji
JNC TN7400 2003-005, 112 Pages, 2003/08
The Shallow Borehole Investigations were one of the first programmes to be conducted at the MIU Construction Site, together with the reflection seismic survey and the re-investigation of borehole DH-2. The Shallow Borehole Investigation targeted the shallow part of the site, from the sedimentary cover rocks to the upper part of the granite. The main aims are understanding of initial groundwater flow and the groundwater chemistry, long term monitoring and to identify structural discontinuities in the sedimentary rocks and the weathered granite. From April to October 2002 four boreholes were drilled through the sedimentary sequence and the weathered granite section at the MIU Construction Site. Planned geological, hydrogeological and hydrochemical investigations were carried out. MP systems were installed in all boreholes by December 2002 and continuous monitoring of hydraulic head begun. Information on geology, hydrogeology and hydrochemistry of the sedimentary formation and the weathered granite was acquired. JNC's quality control procedures for borehole investigation programmes were employed. In addition, recommendations for future borehole investigation programmes, especially in sedimentary rocks, were given.
Goto, Junichi; Hama, Katsuhiro
JNC TN5510 2003-001, 19 Pages, 2003/08
The Horonobe Underground Research Laboratory Project is an investigation project which is planned over 20 years. The investigations are conducted in the three phases, investigations from surface (Phase 1), investigations during construction of the underground facility (Phase 2) and investigations using the facility (Phase 3). The 2003 fiscal year is the fourth year of the Phase 1 surface-based investigations.In the development of techniques to investigate the geological environment, geophysical, geological, surface hydrogeological and borehole investigations are carried out. Models of geological environment are constructed and revised based on the acquired data. In the development of monitoring techniques of the geological environment, long-term monitoring of groundwater pressure is continued in the previously equipped borehole. The long-term monitoring systems are also installed in the remaining boreholes, and measurement is subsequently started. Development of the remotely operated monitoring system (ACROSS) is continued. In the study on long-term stability of the geological environment, monitoring with seismographs, GPS and electromagnetic survey equipment is carried out. In the development of basis for engineering techniques in deep underground, basic design of the underground facility is defined. In the research and development on geological disposal, laboratory tests are continued on the transportation and emplacement equipment of engineered barrier, and on the reinforcement material to make detailed plans of the Phase 2 and 3 investigations. In the improvement of reliability on safety assessment methods, suitability of safety assessment methods is examined using the field and laboratory data. Design of the facility on the ground is defined, and development of the site for the underground laboratory is started. In the environmental survey, environmental monitoring is continued. Cooperation with domestic and overseas research institutes is proceeded.
Semba, Tsuyoshi; Osawa, Hideaki; ; Yabuuchi, Satoshi; Takeuchi, Shinji; Hama, Katsuhiro; Matsuoka, Toshiyuki
JNC TN7410 2002-007, 51 Pages, 2002/10
Tono Geoscience Center, Japan Nuclear Cycle Development Institute has been conducting a wide range of geoscientific research in order to build a firm scientific and technological basis for the research and development of geological disposal. One of the major components of the ongoing geoscientific research programme is the Regional Hydrogeological Study (RHS) project in the Tono region, central Japan. The main goal of the RHS project is to develop and demonstrate surface-based investigation methodologies to characterize geological environments on a regional scale in Japan. The RHS project was initiated in 1992. To date, remote sensing, geological mapping, airborne and ground geophysical investigations, and measurements in eleven deep boreholes have been carried out in the study area (c. 100 km). Groundwater chemistry and hydraulic head monitoring is under way in these boreholes. Important results that have been obtained from these investigations include various information concerning the heterogeneity of lithological, hydrogeological and geochemical, and evolution of the groundwater geochemistry. During fiscal year 2001, hydraulic testing and groundwater sampling were conducted in borehole DH-13 which was drilled during fiscal year 2000. High density electrical resitivity measurements were conducted on a lineament. Groundwater monitoring was continued in the existing boreholes. As a part of evaluation of data uncertainties for modeling and simulation, study was started with the purpose of setting of modeling and simulation area around MIU constructionsite. Development of investigation instruments were also continued.
; Ikeda, Koki; Kumazaki, Naoki; Mukai, Kei; Iwatsuki, Teruki; Hama, Katsuhiro
JNC TN7400 2002-005, 58 Pages, 2002/07
he MIU project has been conducted at the Shobasama site since 1997. JNC decided to shift the construction site for the underground research laboratory to the Mizunami city's property at Togari/Yamanouchi in 2001. The contract to lease the land was signed in January of 2002, and the investigations from surface have now started. In the revised general plan for the geoscientific research programme of the MIU project (JNC, 2002), investigations are conducted in three phases, Phase 1 surface-based investigations, Phase 2 during excavation of shafts and experimental tunnels and Phase 3 the underground operations. Overall objectives of the project are: To develop basic techniques to investigate, analyse and evaluate the deep geological environment, and To develop basic engineering techniques for use in the deep underground. Objectives of phase 1, surface-based investigations are: To construct a geological model based on the investigation from surface and understand the deep geological environment before excavation of the shaft and experimental drifts, To develop the detailed design and construction plan of the shaft and experimental drifts, and To develop scientific plans for Phase 2, investigations during excavation of the shaft and experimental drifts. In the MIU project and the Regional Hydrogeological Study(RHS), a large surface-based study surrounding the MIU, three scales of investigation are employed They are: Regional scale(several 10km square), Local scale(several km square), and Block scale(several 100m square). Investigations in the MIU project are, for the most part, perfomed at the block scale while those in the Regional Hydrogeological Study (RHS) project are performed at the regional and local scales. The Phase 1 surface-based investigations are planned for completion by the end of 2004, while excavation of the main shaft is planned to start within the fiscal year of 2003. The Shallow Borehole Investigations are one of the first programmes, together with the
Ota, Kunio; Nakano, Katsushi; Metcalfe, R.; Ikeda, Koki; ; Amano, Kenji; Takeuchi, Shinji; Hama, Katsuhiro; Matsui, Hiroya
JNC TN7410 99-007, 44 Pages, 1999/08
Nakano, Katsushi; Hama, Katsuhiro; ; ; ; Sato, Toshinori;
JNC TN7400 2000-002, 41 Pages, 1999/06
None
Nakano, Katsushi; Hama, Katsuhiro; ; ; ; Sato, Toshinori;
JNC TN7400 2000-001, 61 Pages, 1999/06
None
*; *; *; Sugo, Takanobu; *; *
Macromolecules, 30(13), p.3888 - 3891, 1997/00
Times Cited Count:50 Percentile:86.05(Polymer Science)no abstracts in English
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JAERI-M 5388, 64 Pages, 1973/09
no abstracts in English
Hayano, Akira; Sawada, Atsushi; Goto, Junichi*; Ishii, Eiichi*; Moriya, Toshifumi*; Inagaki, Manabu*; Kubota, Shigeru*; Ebashi, Takeshi*
no journal, ,
Detailed Investigation Areas have to be selected with focusing on suitability of the host rock in the siting process for high-level radioactive waste disposal in Japan. The suitability of the host rock is evaluated in terms of the preferable disposal condition such as thermal, hydraulic, mechanical and geochemical condition, and the feasibility of the geological disposal project relevant to volumetric capacity of host rock and economics, based on the site model. However, due to a limited number of surveys at relatively early stage of the investigation, the lack of understanding of geological environment at the site causes an uncertainty of the site model. It is essential to clarify an association the important factors relevant to safety assessment (SA) and a repository design (Design) with the information obtained by the site investigation through the site model. In this study, the methodology not only for defining evaluation factors relevant to SA in term of hydrogeology, but also for visualizing the methods to evaluate the factors through the site model is organized into a tree diagram. A method to evaluate groundwater travel time which is one of evaluation factors in granitic rock is organized into a first version of the tree diagram.
Sawada, Atsushi; Hayano, Akira; Goto, Junichi*; Inagaki, Manabu*
no journal, ,
no abstracts in English
Shibata, Masahiro; Sawada, Atsushi; Tachi, Yukio; Inagaki, Manabu*; Kurosawa, Susumu*; Goto, Junichi*; Shibutani, Sanae*
no journal, ,
no abstracts in English
Sawada, Atsushi; Hayano, Akira; Goto, Junichi*; Inagaki, Manabu*
no journal, ,
no abstracts in English