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JAEA Reports

Developing the soil moisture sensor using optical fiber technique (Joint research)

Komatsu, Mitsuru*; Nishigaki, Makoto*; Seno, Shoji*; Hirata, Yoichi*; Takenobu, Kazuyoshi*; Tagishi, Hirotaka*; Kunimaru, Takanori; Maekawa, Keisuke; Yamamoto, Yoichi; Toida, Masaru*; et al.

JAEA-Research 2012-001, 77 Pages, 2012/09

JAEA-Research-2012-001.pdf:4.85MB

This research focused on methods of estimating the amounts of groundwater recharge, which are normally required as upper boundary conditions in groundwater flow analyses, based on measurements of infiltrating water in the ground, to systematize the methods and establish systems which are stable and measurable on site over a long time. Regarding developing measurement systems, fiber-optic strain measurement methods that enable multiple-point and long-distance measurement were used for measuring three quantities: suction pressure, soil moisture and volumetric water content rate obtained by applying water absorption swelling material, and each measurement was discussed. The results showed that the fiber-optic soil aquameter has two types of practical application: one for measuring suction pressure (Type I), and the other for measuring volumetric water content rate obtained by applying water absorption swelling material (Type III). Furthermore, by using measurement instruments in actual fields, the validity of the two methods for estimating the rainfall infiltration capacities of shallow-layer soils, that is, estimating the capacities either directly by measurements of soil water or from unsaturated hydraulic conductivities, was confirmed.

Journal Articles

Numerical assessment of the influence of topographic and climatic perturbations on groundwater flow conditions

Saegusa, Hiromitsu; Yasue, Kenichi; Onoe, Hironori; Moriya, Toshifumi*; Nakano, Katsushi

Stability and Buffering Capacity of the Geosphere for Long-term Isolation of Radioactive Waste; Application to Crystalline Rock, p.257 - 267, 2009/03

In the study, simulations of landform development and groundwater flow have been carried out in the Tono area in order to provide a method to evaluate the effects of long term topographic and climatic changes on groundwater flow conditions. Results of the simulations show the influence of the topographic and climatic perturbations on hydraulic gradient and groundwater velocity. In particular, the influence on hydraulic gradient downstream of the faults normal to the major direction of groundwater flow is much smaller than in the area upstream of the faults. Through this study, it has been confirmed that the method of combining simulations of landform development with groundwater flow is useful for the evaluation of effects of topographic and climatic perturbations on groundwater flow conditions.

Journal Articles

Knowledge management; The Cornerstone of a 21st century safety case

Umeki, Hiroyuki; Osawa, Hideaki; Naito, Morimasa; Nakano, Katsushi; Makino, Hitoshi; McKinley, I. G.*

Proceedings of Safety Cases for Deep Geological Disposal of Radioactive Waste; Where do we stand ?, p.211 - 219, 2008/00

no abstracts in English

Journal Articles

Establishing priorities for HLW R&D in the 21$$^{st}$$ century

Umeki, Hiroyuki; Naito, Morimasa; Makino, Hitoshi; Osawa, Hideaki; Nakano, Katsushi; Miyamoto, Yoichi; McKinley, I. G.*

Proceedings of 15th International Conference on Nuclear Engineering (ICONE-15) (CD-ROM), 8 Pages, 2007/04

no abstracts in English

JAEA Reports

Basic approach to solute transport analysis utilizing information from surface-based investigations at two generic underground research laboratories

Maekawa, Keisuke; Sawada, Atsushi; Ota, Kunio; Kurikami, Hiroshi; Kunimaru, Takanori; Funaki, Hironori; Hama, Katsuhiro; Takeuchi, Shinji; Amano, Kenji; Saegusa, Hiromitsu; et al.

JAEA-Review 2007-011, 8 Pages, 2007/03

JAEA-Review-2007-011.pdf:0.66MB

In the current programme for research and development on the technical aspects of geological disposal, it is of significance to establish techniques for evaluating solute transport with a direct link to surface-based investigations through the processes of data interpretation, modelling and parameter designation within the immediate five years following the H17 Project. This report presents a basic approach to promoting multidisciplinary research activities involving field investigations and relevant solute transport analysis.

JAEA Reports

Horonobe Underground Research Laboratory project synthesis of phase I investigation 2001-2005 volume "Geological Disposal Research"

Fujita, Tomo; Taniguchi, Naoki; Matsui, Hiroya; Tanai, Kenji; Nishimura, Mayuka; Kobayashi, Yasushi; Hiramoto, Masayuki; Maekawa, Keisuke; Sawada, Atsushi; Makino, Hitoshi; et al.

JAEA-Research 2007-045, 140 Pages, 2007/03

JAEA-Research-2007-045-1.pdf:38.33MB
JAEA-Research-2007-045-2.pdf:44.62MB

This report summarizes the progress of research and development on geological disposal during the surface-based investigation phase (2001-2005) in the Horonobe Underground Research Laboratory project (HOR), of which aims are to apply the design methods of geological disposal and mass transport analysis to actual geological environments and derive future subjects based on the results. The design methods of geological disposal were reviewed based on the recent knowledge and the advertences were identified. Then the parameters for virtual design of engineered barrier system, backfill deposition hole and tunnel were set up based on actual geological conditions obtained from the surface-based investigations in HOR as an example of actual geological environment. The conceptual structure from site investigation and evaluation to mass transport analysis was represented as a work flow at first. Then following this work flow a series of procedures for mass transport analysis were carried out based on actual geological conditions obtained from the surface-based investigations in HOR to illustrate the functioning of the work flow and the applicability of this methodology. Consequently, knowledge that will help follow-up or future execution and planning activities was obtained.

Journal Articles

Study of the uncertainties in conceptual modeling for regional groundwater flow characterization

Ijiri, Yuji*; Saegusa, Hiromitsu; Sawada, Atsushi; Nakano, Katsushi; Ono, Makoto*

Chikasui Ryudo Kaiseki To Moderuka Ni Kansuru Shimpojium Happyo Rombunshu, p.67 - 76, 2007/01

no abstracts in English

JAEA Reports

Fundamental concept of knowledge management system for geological disposal technology

Umeki, Hiroyuki; Osawa, Hideaki; Naito, Morimasa; Nakano, Katsushi; Makino, Hitoshi

JAEA-Research 2006-078, 45 Pages, 2006/12

JAEA-Research-2006-078.pdf:5.75MB

Geological disposal technology is a multi-disciplinary field and needs a wide range of relevant information to develop its safety case. Knowledge is defined here in the very widest sense to include all of the information, both explicit and tacit, which underpins a repository project. Knowledge management covers all aspects of the development, integration, quality assurance, communication and maintenance/archiving of such knowledge - including data, information, understanding and experience. In order to ensure that required knowledge is accessible to all stakeholders, including the implementer, the regulator, political decision-makers and general public and that gaps can be identified and prioritised, it is important that knowledge base are structured in a clear and logical manner. In this report, the fundamental concept of the knowledge management system (KMS) for the Japanese high-level radioactive waste (HLW) disposal programme is discussed by illustrating characteristics of an ideal formal KMS and associated knowledge base which could be supported by sophisticated information technology tools, based on the knowledge vision described in the research report "H17: Development and management of the technical knowledge base for the geological disposal of HLW; Knowledge Management Report". In addition, a mid-term plan up to the fiscal year 2009 is discussed for development and installation of the KMS.

Journal Articles

Key R&D activities supporting disposal of radioactive waste; Responding to the challenges of the 21st century

Miyamoto, Yoichi; Umeki, Hiroyuki; Osawa, Hideaki; Naito, Morimasa; Nakano, Katsushi; Makino, Hitoshi; Shimizu, Kazuhiko; Seo, Toshihiro

Nuclear Engineering and Technology, 38(6), p.505 - 534, 2006/08

Ensuring sufficient supplies of clean, economic and acceptable energy is a critical global challenge for the 21st century. There seems little alternative to a greatly expanded role for nuclear power, but implementation of this option will depend on ensuring that all resulting wastes can be disposed of safely. Although there is a consensus on the fundamental feasibility of such disposal by experts in the field, concepts have to be developed to make them more practical to implement and, in particular, more acceptable to key stakeholders. By considering global trends and using illustrative examples from Japan, key areas for future R&D are identified and potential areas where the synergies of international collaboration would be beneficial are highlighted.

JAEA Reports

None

Makino, Hitoshi; Sawada, Atsushi; Maekawa, Keisuke; Shibata, Masahiro; Sasamoto, Hiroshi; Yoshikawa, Hideki; Wakasugi, Keiichiro; Koo, Shigeru*; Hama, Katsuhiro; Kurikami, Hiroshi; et al.

JNC TN1400 2005-021, 148 Pages, 2005/09

JNC-TN1400-2005-021.pdf:22.58MB

None

JAEA Reports

Working Program for MIZ-1 Borehole Investigations

Nakano, Katsushi; ; Takeuchi, Shinji; ; ; ;

JNC TN7400 2002-008, 77 Pages, 2003/03

JNC-TN7400-2002-008.pdf:82.29MB

JAEA Reports

None

Osawa, Hideaki; Nakano, Katsushi;

JNC TN7410 2002-008, 37 Pages, 2002/12

JNC-TN7410-2002-008.pdf:1.45MB

None

JAEA Reports

None

Osawa, Hideaki; Nakano, Katsushi; Takeuchi, Shinji; ; ; Sato, Toshinori;

JNC TN7410 2002-005, 38 Pages, 2002/07

JNC-TN7410-2002-005.pdf:1.29MB

JAEA Reports

An Overviwe of the MIU-4 Borehole Investigations during Phase III

Kumazaki, Naoki; ; Nakano, Katsushi; ; ; Takeuchi, Shinji;

JNC TN7400 2002-002, 44 Pages, 2002/04

JNC-TN7400-2002-002.pdf:2.13MB

Surface-based investigations are now being carried out at the MIU site. Drilling of the MIU-4 borehole, one of the planned surface-based investigations in the MIU project, was commenced in June 2000. The main aims of the MIU-4 borehole investigations are to address the key issues (eg hydrochemistry, 3-D rock mechanics, geometry of steeply dipping water-conducting fractures, etc) remaining after the previous borehole investigations and to continue the development of appropriate, comprehensive techniques for assessing the deep subsurface. The borehole was dfilled from the centre of the MIU site in a north-easterly direction; the inclination and planned drilling length is 30$$^{circ}$$ from the vertical and 790m respectively. During MIU-4 Phase III (from july to October 2000), the borehole was drilled through the entire weathered section of the basement granite (from 88.65 to 134.47m along the borehole) at the MIU site. Planned geological, hydrogeological, hydrochemical, and additional investigations were carried out. High-quality information on geology, hydrogeology and hydrochemistry of the weathered granite was acquired and consequently this advanced the understanding of the geological environment at the MIU site. The techniques and QA/QC procedures adopted to the MIU-4 Phase I/II investigations proved to be effective for the current borehole investigations. In addition, a couple of recommendations for the remaining MIU-4 Phases and future borehole investigation programmes were given.

Journal Articles

Mizunami Underground Research Laboratory In Japan Pre-Excavation Site Characterization and Influence on Design Concepts

McCrank; ; Koide, Kaoru; ; ; Nakano, Katsushi

International Conference on Radioactive Waste Management and Environmental Remediation, 0 Pages, 2001/12

The Mizunami Underground Research Laboratory will be constructed by Japan Nuclear Cycle Development Institute in Gifu Prefecture, central Japan. This paper outlines the Phase I, surface based investigations curently underway, the site knowledge developed and the influence on the current conceptual design.

Journal Articles

Mizunami Underground Research Laboratory In Japan; Pre-Excavation Site Characterization and Influence on Design Concepts

McCrank; ; Koide, Kaoru; ; ; Nakano, Katsushi

The 8th International Conference on Radioactive Waste Management and Environmental Remediation, 0 Pages, 2001/12

The Mizunami Underground Research Laboratory will be constructed by Japan Nuclear Cycle Development Institute in Gifu Prefecture, central Japan. This paper outlines the Phase I, surface based investigations currently underway, the site knowledge developed and the influence on the current conceptual design.

JAEA Reports

The current status of geoscientific research database system

Yoshida, Yuichi*; Nakano, Katsushi; ; Shiga, Takahiro*; Saegusa, Hiromitsu

JNC TN7410 2002-003, 42 Pages, 2001/09

JNC-TN7410-2002-003.pdf:1.36MB

Tono Geoscience Center (TGC), Japan Nuclear Cycle Development Institute has been conducting the Mizunami Underground Research Laboratory Project and Regional Hydrogeological Study in the Tono region, central Japan, as a part of a geoscientific study of the deep geological environment. TGC has developed the geoscientific research database since 1996 in order to manage and utilize efficiently data which has been acquired by these projects. The aims of development of geoscientific research database system are summarized as follows; (1)To manage high quality data for a long term (2)To simplify for retrieval and getting data (3)To share data among the researchers of various fields. (4)To guarantee quality of data by charging of the condition at the time of data acquisition and the information on data analysis process. (5)To publish the data for third party effectively As a prototype, TGC introduced the commercial database system, called G★BASE which was developed by Geothermal Energy Research & Development Co,, Ltd. The advantage of the database system is to be able to manage various types of geoscientific information and visualize them. Since the function for charging the data and retrieval of the data are designed individually in the database system, the database system can be improved simply for installing and managing unexpected type of data. Taking advantage of these features, TGC has been improving the geoscientific research database system to install and manage properly the data from various types of field investigations. TGC is also investigating the RAW DATABASE for handling the measured raw data and the SITE DATABASE for charging the site condition at the time of data acquisition. In the future, these database systems are going to be combined as the geoscientitic research database system.

Journal Articles

None

Nakano, Katsushi; Osawa, Hideaki

Saikuru Kiko Giho, (12), p.91 - 106, 2001/09

None

JAEA Reports

None

Osawa, Hideaki; Nakano, Katsushi; ; Takeda, Seietsu

JNC TN7410 2001-013, 54 Pages, 2001/06

JNC-TN7410-2001-013.pdf:3.52MB

JAEA Reports

Mizunami underground research laboratory project results from 1996-1999 period

Nakano, Katsushi; Takeuchi, Shinji; ; ; ; ;

JNC TN7400 2001-001, 206 Pages, 2001/03

JNC-TN7400-2001-001.pdf:2.54MB

Tono Geoscience Center (TGC), Japan Nuclear Cycle Development Institute (JNC) 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 Mizunami Underground Research Laboratory (MIU) project in the Tono region, central Japan. The R&D work of the MIU project has the following main goals: (1)Develop comprehensive investigation techniques for the geological environment. (2)Acquire data on the deep geological environment. (3)Develop a range of engineering techniques for deep underground application. The development of the MIU will occur in three overlapping phases over a 20-year life cycle: Phase One: Surface-based Investigations, began in 1996; Phase Two: Construction and Phase Three: Operations, have not started. The MIU site has been investigated by geological, geophysical, hydrogeological, hydrochemical and rock mechanical surveys on the surface and in the boreholes. To date, ground geophysics and investigation in three 1,000m-deep boreholes have been carried out. The hydro monitoring equipment has set up. Based on the information, modelling work on the geological, hydrogeological and rock mechanical conditions at the MIU site has been conducted. The groundwater simulation has been carried out in order to confirm the usefuless of the hydrogeological modelling methodology. Technical knowledge and experience have been accumulated, which allow application of the methodologies and techniques to characterize the deep geological environment in crystalline rock. The results from these R&D activities were used as prime inputs for the H12 report that JNC submitted to the Japanese Government in 1999. Results from such R&D are also acknowledged by other geoscientific studies in general. JNC will synthesize the results from R&D activities to provide a scientific and ...

51 (Records 1-20 displayed on this page)