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Hama, Katsuhiro; Sasao, Eiji; Iwatsuki, Teruki; Onoe, Hironori; Sato, Toshinori; Fujita, Tomoo; Sasamoto, Hiroshi; Matsuoka, Toshiyuki; Takeda, Masaki; Aoyagi, Kazuhei; et al.
JAEA-Review 2016-014, 274 Pages, 2016/08
JAEA-Review-2016-014.pdf:44.45MB
We synthesized the research results from the Mizunami/Horonobe Underground Research Laboratories (URLs) and geo-stability projects in the second midterm research phase. This report can be used as a technical basis for the Nuclear Waste Management Organization of Japan/Regulator at each decision point from siting to beginning of disposal (Principal Investigation to Detailed Investigation Phase).
Saegusa, Hiromitsu; Mizuno, Takashi; Umeda, Koji; Yasue, Kenichi; Sasao, Eiji; Iwatsuki, Teruki; Kato, Tomoko; Kokubu, Yoko; Takeuchi, Ryuji; Matsuoka, Toshiyuki
no journal, ,
no abstracts in English
Matsuoka, Toshiyuki; Komatsu, Tetsuya; Yasue, Kenichi; Onoe, Hironori; Oyama, Takuya; Iwatsuki, Teruki; Sasao, Eiji; Umeda, Koji
no journal, ,
This paper summarized the current status of R&D activities with development of geological-evolutionary model in the Horonobe area, northern Hokkaido. This study has been carried out in the area of approx. 100 km 
30 km. Two stages, approx. 1 Ma and 0.33 Ma were selected for paleo-geological modeling based on geological history of several millions of years in and around the study area. 3D steady-state groundwater flow simulations and sensitivity analysis using these models were carried out. Long-term evolution of groundwater flow conditions caused by long-term geological phenomena was assessed using statistical analysis. From the results, the spatial distribution of long-term stability of groundwater flow conditions were estimated and important factors for assessment of long-term evolution of groundwater flow conditions were extracted. In addition, the results of groundwater flow simulation were analyzed from the viewpoint of geochemical environment within the groundwater.
Onoe, Hironori; Komatsu, Tetsuya; Yasue, Kenichi; Iwatsuki, Teruki; Takeuchi, Ryuji; Kato, Tomoko; Sasao, Eiji; Umeda, Koji
no journal, ,
This paper summarized the current status of R&D activities with development of geological-evolutionary model in the Tono area, Central Hokkaido. This study has been carried out in the area of approx. 20 km square. Four stages, approx. 3Ma, 1Ma, 0.45Ma and 0.14Ma were selected for paleo-geological modeling based on geological history of several millions of years in and around the study area. 3D steady-state groundwater flow simulations and sensitivity analysis using these models were carried out. Long-term evolution of groundwater flow conditions caused by long-term geological phenomena was assessed using statistical analysis. From the results, the spatial distribution of long-term stability of groundwater flow conditions were estimated and important factors for assessment of long-term evolution of groundwater flow conditions were extracted. In addition, the results of groundwater flow simulation were analyzed from the viewpoint of geochemical environment within the groundwater.
Yasue, Kenichi; Sasao, Eiji; Onoe, Hironori; Iwatsuki, Teruki; Kato, Tomoko; Takeuchi, Ryuji; Kokubu, Yoko; Asamori, Koichi; Umeda, Koji
no journal, ,
Geosphere stability project is being carried out by Japan Atomic Energy Agency in order to establish techniques for investigation, analysis and assessment of the long-term evolution of geological environments, taking into account long-term geological phenomena such as volcanism, faulting, uplift, denudation, climate change, and sea-level change. This project is being conducted under a contract with Agency of Natural Resources and Energy, part of Ministry of Economy, Trade and Industry of Japan as part of its R&D supporting program for developing technology of geological disposal of high-level radioactive waste. This project has the development of a numerical model "geological-evolutionary model" expressing a change of the geological environments and the development of "innovative elemental technique" that is elemental technology required for model construction.
Tokuyasu, Kayoko; Yasue, Kenichi; Komatsu, Tetsuya; Tamura, Itoko; Horiuchi, Yasuharu
no journal, ,
We have carried out the research and development of provenance analysis techniques to elucidate the mountain-building stage using quartz ESR signals in sediments. The R&D was conducted using the Tokai Formation including Toki Sand and Gravel Formation distributed over the Tono area. In the northern part of the area, bedrocks consist of sedimentary rocks, Nohi Rhyolite and Sanyo Granite, whereas consist of Ryoke Granites in the southern part. Samples of sediments were taken from the quarry located between the Tsukechi River and Atera fault. Basement rock samples were also taken in and around the quarry. Outcrop observation indicates that the provenance of sediments changed between the lower and upper parts. Quartz grains for ESR measurements were extracted from all samples. As a result, granitic rocks of Sanyo belt were not exposed to the drainage basin during the deposition of the lower part between 3.9 and 2.0 Ma, then the granitic rocks were exposed during the deposition of upper part after about 2.0 Ma. We conclude that it is possible to estimate the sediment provenance using ESR properties.
Tokuyasu, Kayoko; Yasue, Kenichi; Komatsu, Tetsuya; Tamura, Itoko; Horiuchi, Yasuharu
no journal, ,
We have carried out the research and development of provenance analysis techniques to elucidate the mountain-building stage using quartz ESR signals in sediments. The R&D was conducted using the Tokai Formation including Toki Sand and Gravel Formation distributed over the Tono area. In the northern part of the area, bedrocks consist of sedimentary rocks, Nohi Rhyolite and Sanyo Granite, whereas consist of Ryoke Granites in the southern part. Samples of sediments were taken from the quarry located between the Tsukechi River and Atera fault. Basement rock samples were also taken in and around the quarry. Outcrop observation indicates that the provenance of sediments changed between the lower and upper parts. Quartz grains for ESR measurements were extracted from all samples. As a result, granitic rocks of Sanyo belt were not exposed to the drainage basin during the deposition of the lower part between 3.9 and 2.0 Ma, then the granitic rocks were exposed during the deposition of upper part after about 2.0 Ma. We conclude that it is possible to estimate the sediment provenance using ESR properties.
Ishimaru, Tsuneari; Yasue, Kenichi*; Onoe, Hironori; Matsuoka, Toshiyuki; Komatsu, Tetsuya; Iwatsuki, Teruki; Takeuchi, Ryuji; Kato, Tomoko; Sasao, Eiji
no journal, ,
JAEA have been developing the Geological-Evolutionary Models (GEMs) taking into account of long-term change of the geological environment in order to evaluate the geosphere stability. The purpose of the GEMs is to establish modeling techniques, which can express a long-term change of the geological environments. In addition, this project has the R&D such as the methodology for verification and an uncertainty estimate of the models, and the visualization technology of the model. In this R&D, FEP (Features, Events and Processes) analysis and scenario development for geological-evolutionary modeling of mountain area and plain area have been carried out. Paleo-hydrogeological model were constructed in consideration for long-term geological environments such as topography, geology and surficial environment, and spatial distribution of long-term stability of groundwater flow.
Onoe, Hironori; Matsuoka, Toshiyuki; Komatsu, Tetsuya; Yasue, Kenichi*; Iwatsuki, Teruki; Takeuchi, Ryuji; Kato, Tomoko; Sasao, Eiji
no journal, ,
JAEA have been developing the Geological-Evolutionary Models (GEMs) taking into account of long-term change of the geological environment in order to evaluate the geosphere stability. This paper summarized the current status of Research and development activities with analysis on effects of uncertainties of GEMs for evaluation of long-term variability of groundwater flow conditions.
Yokoyama, Tatsunori; Mitsuguchi, Takehiro; Sueoka, Shigeru
no journal, ,
In recent years, it has become possible to carry out high-precision microscale age dating of geological samples using developed micro-analytical techniques such as SIMS, LA-ICP-MS, etc. Application of LA-ICP-MS-based microscale U-Pb dating is extending from U-rich heavy minerals such as zircon, apatite and monazite to U-depleted minerals such as calcite. This kind of method enables age determination of several types of mineral grains occurring within rock bodies, and thereby reveals chronological changes in chemical composition of source materials from which the minerals were crystallized, with some cases in which thermal history of the crystal formation system can be reconstructed. For research and development of geological disposal techniques for high-level radioactive wastes, we develop and facilitate geochronological dating techniques for evaluation of long-term stability in geological environments, at Tono Geoscience Center, Japan Atomic Energy Agency. In our presentation, we introduce the current status of our development for research on long-term stability of geological environments, U-Pb dating of calcite, U-Pb dating of young zircon and trace element analysis by using LA-ICP-MS.