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JAEA Reports

Study of hydrogeology in the Mizunami Underground Research Laboratory Project; Hydrogeological modeling and groundwater flow simulation based on data of hydraulic and geochemical impacts during the construction of the MIU facilities; FY 2009

Shimo, Michito*; Kumamoto, So*; Tsuyuguchi, Koji; Onoe, Hironori; Saegusa, Hiromitsu; Mizuno, Takashi; Oyama, Takuya

JAEA-Research 2012-043, 98 Pages, 2013/03

JAEA-Research-2012-043.pdf:26.71MB

One of the goals of the Mizunami Underground Research Laboratory (MIU) Project is to develop technical basis for investigation, analysis and evaluation technologies for understanding the deep underground geological environment in various scales. Understanding groundwater flow system is one of the important issues in the project, and to achieve this purpose, technologies for hydrogeological model and groundwater flow simulation technique, have to be established. As a result of this study, the significant hydrogeological structures around the MIU Construction Site were estimated. The inflow rate into the MIU facilities and hydraulic and geochemical impacts around the MIU Construction Site caused by the MIU facilities construction were predicted. The effect of pre-grouting to the MIU facilities was also confirmed.

JAEA Reports

Study on hydrogeology on Mizunami Underground Research Laboratory Project; Hydrogeological modeling and groundwater flow simulation based on data of hydraulic and geochemical impacts during the construction of the MIU facilities; FY2008

Shimo, Michito*; Kumamoto, So*; Kosaka, Hiroshi; Onoe, Hironori; Saegusa, Hiromitsu; Mizuno, Takashi; Oyama, Takuya

JAEA-Research 2012-004, 126 Pages, 2012/04

JAEA-Research-2012-004.pdf:14.3MB

One of the goals of Mizunami Underground Research Laboratory (MIU) Project is to develop technical basis for investigation, analysis and evaluation technologies for understanding deep underground geological environment in various scales. Understanding groundwater flow system is one of the important issues in the project, and to achieve this purpose, technologies for a hydrogeological model and the groundwater flow simulation technique, have to be established. In this study, hydrogeological modeling and groundwater flow simulations have been carried out in order to predict hydraulic and geochemical impacts around the MIU Construction Site and inflow rate into the MIU facilities. As a result of this study, the significant hydrogeological structures could be estimated. The inflow rate into the MIU facilities and hydraulic and geochemical impacts with the MIU facilities construction could be predicted. The effect of pre-grouting to the MIU facilities could be also confirmed.

JAEA Reports

Mizunami Underground Research Laboratory Project (Study on hydrogeology in crystalline fractured rock); Hydrogeological modeling and groundwater flow simulation based on data of hydraulic impacts during construction of the MIU facilities; FY2006 - 2007

Shimo, Michito*; Kumamoto, So*; Onoe, Hironori; Saegusa, Hiromitsu

JAEA-Research 2011-017, 132 Pages, 2011/09

JAEA-Research-2011-017.pdf:9.55MB

In this study, hydrogeological modeling and groundwater flow simulations on the Local scale area have been carried out in order to predict hydraulic impacts around the MIU Construction Site and inflow rate into the MIU facilities using the result of Surface-based Investigation phase (Phase 1), the data of hydraulic responses in monitoring boreholes, inflow rate into the MIU facilities and the result of pilot borehole investigation in Construction phase (Phase 2). As a result of this study, the significant hydrogeological structures around the MIU Construction Site could be estimated. The inflow rate into the MIU facilities and hydraulic impacts around the MIU Construction Site with the MIU facilities construction could be predicted. The effect of pre-grouting to the MIU facilities could be also confirmed.

JAEA Reports

Study on flow and mass transport through fractured sedimentary rocks (Joint research)

Shimo, Michito*; Kumamoto, So*; Ito, Akira*; Karasaki, Kenji*; Sawada, Atsushi; Oda, Yoshihiro; Sato, Hisashi

JAEA-Research 2010-040, 57 Pages, 2010/11

JAEA-Research-2010-040.pdf:5.12MB

In safety analysis of geological disposal of the high-level nuclear waste, it is important to evaluate appropriately the mass transport characteristics of the bedrock as the natural barrier. Especially, it has been found that the porosity of the rock matrix is high and fractured zones are developing and therefore the mass transport characteristics will be the mixture of those for porous media and the fractured media. In this work, we conducted, (1) a study on the method to mine out the rock block sample of tens of-centimeter to maximum 1 m scale, (2) a study on a method of the tracer test using a rock block sample and a series of scoping analysis. We also examined the uncertainty associated the hydrogeological model using a method combining a forward and inverse analysis, based on the various type of data sets obtained at Horonobe site, such as the temperature distribution and hydraulic head and salinity distribution.

JAEA Reports

Study on flow and mass transport through fractured sedimentary rocks, 3

Shimo, Michito*; Kumamoto, So*; Ito, Akira*; Karasaki, Kenji*; Sawada, Atsushi; Oda, Yoshihiro; Sato, Hisashi

JAEA-Research 2009-060, 70 Pages, 2010/03

JAEA-Research-2009-060.pdf:14.26MB

It is important for safety assessment of HLW geological disposal to evaluate groundwater flow and mass transport in deep underground appropriately. Though it is considered that the mass transport in sedimentary rock occurs in pores between grains mainly, fractures of sedimentary rock can be main paths. In this study the following three tasks were carried out: (1) laboratory hydraulic and tracer experiments using the rock cores of Wakkanai formation, (2) a study on the tracer test and sampling technique for the larger scale, (3) a study on the reduction technique of uncertainty of the hydrogeological models using data from surface-based investigation. On the block scale tracer test technique, the sampling technique using wire saw and tracer test technique using block samples were suggested. As for the reduction technique of uncertainty of the hydrogeological model, availability of the information other than pressure data, such as the temperature and salinity and all, were presented.

Journal Articles

Uncertainty reduction of hydrologic models using data from surface-based investigation

Karasaki, Kenji*; Ito, Kazumasa*; Wu, Y.*; Shimo, Michito*; Sawada, Atsushi; Maekawa, Keisuke; Hatanaka, Koichiro

Proceedings of TOUGH Symposium 2009 (Internet), 9 Pages, 2009/09

JAEA Reports

Study on flow and mass transport through fractured sedimentary rocks, 2

Shimo, Michito*; Kumamoto, So*; Karasaki, Kenji*; Sato, Hisashi; Sawada, Atsushi

JAEA-Research 2008-101, 70 Pages, 2009/03

JAEA-Research-2008-101.pdf:7.03MB

It is important for safety assessment of HLW geological disposal to evaluate groundwater flow and mass transport in deep underground. The fractures might dominate flow and transport even though it is soft sedimentary rocks. In this study the following three tasks were carried out. Firstly, non-sorbing tracer experiments were carried out. The obtained breakthrough curve was interpreted and mass transport parameters, such as longitudinal dispersivity, matrix diffusion coefficient, transport aperture, were obtained. Secondary, several cases mass transport simulations using single fracture model that the hydraulic aperture, transport aperture, and porosity is different were performed to study on the influence that a difference of the aperture and porosity gives a mass transport in the fractured sedimentary rocks. Finally, groundwater flow was simulated to estimate the flow direction and recharge from the surface using the temperature distribution data obtained in Horonobe boreholes.

Journal Articles

Hydrogeological modelling with inflow volume and pressure response during groundwater recovery and discharge in shaft

Kumamoto, So*; Shimo, Michito*; Saegusa, Hiromitsu; Oyama, Takuya

Dai-38-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.281 - 286, 2009/01

The Mizunami Underground Research Laboratory is being constructed by Japan Atomic Energy Agency in the Cretaceous Toki Granite in the Tono area, Central Japan. During construction, the information needed for testing and revising the hydrogeological model has been obtained. During shaft excavation, pumping of groundwater from the shaft has to be halted and the water level in shaft was recovered for the improvement of facility for treatment of discharged groundwater. This period was divided into three major phases, such as excavation, recovery and discharging phases, and hydraulic behavior in the phases was considered as a large-scale pumping test. In this study, model testing and calibration using the data of inflow volume and hydraulic behavior observed in these three phases have been carried out.

Journal Articles

Evaluation of uncertainties originating from the different modeling approaches applied to analyze regional groundwater flow in the Tono area of Japan

Ijiri, Yuji*; Saegusa, Hiromitsu; Sawada, Atsushi; Ono, Makoto*; Watanabe, Kunio*; Karasaki, Kenji*; Doughty, C.*; Shimo, Michito*; Fumimura, Kenichi*

Journal of Contaminant Hydrology, 103(3-4), p.168 - 181, 2009/01

 Times Cited Count:7 Percentile:27.71(Environmental Sciences)

Qualitative evaluation of the effects of uncertainties originating from scenario development, conceptual models, and parameter values is an important subject in the area of safety assessment for high-level nuclear waste disposal. In this study, regional-scale groundwater flow analyses for the Tono area, Japan were conducted using three continuous models which were designed to handle heterogeneous porous media. We evaluated the simulation results to quantitatively analyze uncertainties originating from conceptual models. We found that uncertainties originating from conceptual models (1) greatly depend on boundary conditions and hydrological structures to be modeled, which are assigned by modelers, and (2) are larger than uncertainties originating from the variance in realizations of the Monte Carlo method in stochastic modeling.

Journal Articles

Hydrogeological characterization for estimation of hydraulic responses due to construction of the Mizunami Underground Research Laboratory

Saegusa, Hiromitsu; Shimo, Michito*; Kumamoto, So*; Onoe, Hironori; Takeuchi, Ryuji; Takeuchi, Shinji; Oyama, Takuya

Proceedings of 36th International Association of Hydrogeologists Congress 2008 (IAH 2008) (CD-ROM), 10 Pages, 2008/10

One of the main goals of the Mizunami Underground Research Laboratory project is to establish comprehensive techniques for investigation, analysis, and assessment of the deep geological environment. Hydrogeological investigations using a stepwise manner have been carried out to obtain information on important properties. Hydrogeological modeling and groundwater flow simulations, which is for estimations of volume of inflow into underground tunnels and impact of construction of underground facilities on water table and hydraulic pressure, have been carried out by synthesizing these investigation results. From the study, the uncertainty of the hydrogeological model was evaluated and the main issues for further investigations were identified. Also, hydrogeological modeling and groundwater flow simulation using the data of hydraulic responses due to shaft sinking have been carried out in order to test/revise the models constructed in Phase I. These results are introduced in this paper.

JAEA Reports

Study on flow and mass transport through fractured sedimentary rocks (Contract research)

Shimo, Michito*; Kumamoto, So*; Karasaki, Kenji*; Sawada, Atsushi; Maekawa, Keisuke; Sato, Hisashi

JAEA-Research 2008-029, 95 Pages, 2008/03

JAEA-Research-2008-029.pdf:4.51MB

It is important for safety assessment of HLW geological disposal to evaluate groundwater flow and mass transport in deep underground accurately. The objective of this study is to expand the data of flow and mass transport properties in fractured sedimentary rocks, and to estimate these properties in larger scale rocks, such as in situ test scale, using the results of the laboratory tests and the borehole investigations. This study was carried out under the following three tasks: (1) laboratory hydraulic and tracer experiments using the rock specimens of Koetoi formation obtained at underground research facility under construction in the Horonobe area, (2) a numerical study on the influence that a difference of the groundwater flow velocity in the fractures gives a mass transport in the fractured sedimentary rocks, (3) a numerical study on the contributing factors to groundwater flow such as effect of low permeability layers.

JAEA Reports

Study on flow and mass transport through fractured soft sedimentary rocks (Contract research)

Shimo, Michito*; Kumamoto, So*; Maekawa, Keisuke

JAEA-Research 2007-016, 141 Pages, 2007/03

JAEA-Research-2007-016.pdf:20.36MB

It is important for safety assessment of HLW geological disposal to evaluate groundwater flow and mass transport in deep underground accurately. Though it is considered that the mass transport in sedimentary rock occurs in pores between grains mainly, fractures of sedimentary rock can be main paths. The objective of this study is to establish a conceptual model for flow and mass transport in fractured soft sedimentary rock. In previous study, a series of laboratory hydraulic and tracer tests and numerical analyses were carried out using sedimentary rock specimens obtained from Koetoi and Wakkanai formation. Single natural fractured cores and rock block specimen were used for the tests and analyses. The results indicated that the matrix diffusion played an important role for mass transport in the fractured soft sedimentary rocks. In this study, the following two tasks were carried out: (1) laboratory hydraulic and tracer experiments of rock cores of koetoi and Wakkanai formation obtained at HDB-9, HDB-10 and HDB-11 boreholes and a rock block specimen, Wakkanai formation, obtained at an outcrop in the Horonobe area, (2) a numerical study on the conceptual model of flow and mass transport through fractured soft sedimentary rocks. Non-sorbing tracer experiments using naturally fractured cores and rock block specimens were carried out. Potassium iodide was used as a tracer. The obtained breakthrough curves were interpreted and fitted by using a numerical simulator, and mass transport parameters, such as longitudinal dispersivity, matrix diffusion coefficient, transport aperture, were obtained. Mass transport simulations using a fracture network model, a continuum model and a double porosity model were performed to study the applicability of continuum model and double porosity model for transport in fractured sedimentary rock.

Journal Articles

Predictive analysis of groundwater flow due to the excavation of Horonobe URL

Kumamoto, So*; Shimo, Michito*; Kurikami, Hiroshi

Chikasui Ryudo Kaiseki To Moderuka Ni Kansuru Shimpojium Happyo Rombunshu, p.43 - 50, 2007/01

no abstracts in English

Journal Articles

Calibration of groundwater flow model with result of cross-hole hydraulic test

Kumamoto, So*; Shimo, Michito*; Saegusa, Hiromitsu; Onoe, Hironori

Dai-36-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.287 - 292, 2007/01

no abstracts in English

Journal Articles

Hydrogeological model in Horonobe Underground Research Laboratory project

Kurikami, Hiroshi; Kunimaru, Takanori; Yabuuchi, Satoshi; Seno, Shoji; Shimo, Michito*; Kumamoto, So*

Proceedings of 2nd International Conference on Coupled T-H-M-C Processes in Geo-systems; Fundamentals, Modeling, Experiments and Applications (GeoProc 2006), p.584 - 589, 2006/05

no abstracts in English

Journal Articles

Long-term simulation of ambient groundwater chemistry at Horonobe underground research laboratory, Japan; Application of coupled hydro-geochemical model

Yamamoto, Hajime*; Kunimaru, Takanori; Kurikami, Hiroshi; Shimo, Michito*; Xu, T.*

Proceedings of 2nd International Conference on Coupled T-H-M-C Processes in Geo-systems; Fundamentals, Modeling, Experiments and Applications (GeoProc 2006), p.382 - 387, 2006/05

no abstracts in English

Journal Articles

Groundwater flow modelling for prediction of hydraulic changes during URL construction and investigation planning based on the modelling

Saegusa, Hiromitsu; Shimo, Michito*; Fumimura, Kenichi*; Takeuchi, Shinji; Onoe, Hironori

Nihon Chikasui Gakkai 2006-Nen Shuki Koenkai Koen Yoshi, p.258 - 263, 2006/00

no abstracts in English

JAEA Reports

Data aquisition for hydrology and mass transport properties of sedimentary rocks in subsurface layer

Shimo, Michito*; Kumamoto, So*

JNC TJ5410 2005-003, 40 Pages, 2005/03

JNC-TJ5410-2005-003.pdf:2.27MB

The objective of this study is to understand hydraulic and mass transeport properties of sedimentary rock at shallow depth. A series of laboratory hydraulic and tracer tests using sedimentary rock specimens in subsurface layer obtained from shallow boreholes. The obtained hydraulic conductivities varied between 8.5 10-10 - 2.0 10-9m/s. The effective diffusion coeficients obtained from the through diffusion test were 1.5 10-10 - 3.5 10-10m/s

JAEA Reports

Modeling study on geological environment at Horonobe URL site

Shimo, Michito*; Yamamoto, Hajime*; Kumamoto, So*; Fujiwara, Yasushi*; Ono, Makoto*

JNC TJ5400 2004-004, 120 Pages, 2005/02

JNC-TJ5400-2004-004.pdf:78.08MB
JNC-TJ5400-2004-004(errata).pdf:0.08MB

The Horonobe underground research project has been carried out by Japan Nuclear Cycle Development Institute to study the geological environment of sedimentary rocks in deep underground. The objectives of this study are to develop a geological environment model, which incorporate current findings and latest data obtained through the geological, geophysical, and borehole investigations at Horonobe site, and to predict the hydrological and geochemical impacts caused by the URL shaft excavation to the surrounding area.

JAEA Reports

HDB-8 Borehole Investigations in the Horonobe Underground Research Program

Yamamoto, Takuya*; Shimo, Michito*; Fujiwara, Yasushi*; Hattori, Hiromichi*; Nago, Makito*; Tadokoro, Teruo*; Nakagaki, Shinichi*

JNC TJ5400 2005-006, 795 Pages, 2004/03

JNC-TJ5400-2005-006.pdf:96.75MB
JNC-TJ5400-2005-006(errata).pdf:0.08MB

HDB-8 (470 m deep Borehole) was drilled at Hokushin Area of Horonobe Town, Teshio District, Hokkaido, Japan in order to investigate the characteristic of deep underground.

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