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Journal Articles

Does fault activation affect the hydraulic disconnectivity of faults in mudstone?

Ono, Hirokazu; Takeda, Masaki; Ishii, Eiichi

Extended abstract of International Conference on Coupled Processes in Fractured Geological Media; Observation, Modeling, and Application (CouFrac 2020) (Internet), 4 Pages, 2020/11

JAEA Reports

Synthesis report on the R&D for the Horonobe Underground Research Laboratory; Project carried out during fiscal years 2015-2019

Nakayama, Masashi; Saiga, Atsushi; Kimura, Shun; Mochizuki, Akihito; Aoyagi, Kazuhei; Ono, Hirokazu; Miyakawa, Kazuya; Takeda, Masaki; Hayano, Akira; Matsuoka, Toshiyuki; et al.

JAEA-Research 2019-013, 276 Pages, 2020/03

JAEA-Research-2019-013.pdf:18.72MB

The Horonobe Underground Research Laboratory (URL) Project is being pursued by the Japan Atomic Energy Agency (JAEA) to enhance the reliability of relevant disposal technologies for geological disposal of High-level Radioactive Waste through investigations of the deep geological environment within the host sedimentary rock at Horonobe Town in Hokkaido, north Japan. The investigations will be conducted in three phases, namely "Phase 1: Surface based investigations", "Phase 2: Construction phase" (investigations during construction of the underground facilities) and "Phase 3: Operation phase" (research in the underground facilities). According to the research plan described in the 3rd Mid- and Long- term Plan of JAEA, "Near-field performance study", "Demonstration of repository design option", and "Verification of crustal-movement buffering capacity of sedimentary rocks" are important issues of the Horonobe URL Project, and schedule of future research and backfill plans of the project will be decided by the end of 2019 Fiscal Year. The present report summarizes the research and development activities of these 3 important issues carried out during 3rd Medium to Long-term Research Phase.

JAEA Reports

Data of tracer migration test and borehole investigations for fracture zone in the Wakkanai formation at Horonobe Underground Research Laboratory

Tsushima, Masahito*; Takeda, Masaki; Ono, Hirokazu

JAEA-Data/Code 2018-008, 78 Pages, 2018/10

JAEA-Data-Code-2018-008.pdf:6.73MB
JAEA-Data-Code-2018-008(errata).pdf:0.11MB
JAEA-Data-Code-2018-008-appendix(DVD-ROM).zip:263.67MB

Japan Atomic Energy Agency (JAEA) has been conducting "geoscientific study" and "research and development on geological disposal" in the Horonobe Underground Research Laboratory (URL). In-situ tracer migration test for fracture and matrix in the argillaceous rock, called for Wakkanai formation, has been conducted in the Horonobe URL project. This report summarizes data of borehole investigations and tracer migration test for fracture zone.

Journal Articles

Evaluating test conditions for in situ tracer migration test in fractured siliceous mudstone involving groundwater with dissolved gas

Takeda, Masaki; Ishii, Eiichi; Ono, Hirokazu; Kawate, Satoshi*

Genshiryoku Bakkuendo Kenkyu (CD-ROM), 25(1), p.3 - 14, 2018/06

Fault zones and excavation damaged zones have the potential to act as flow paths, and the characterization of solute transport in such zones in mudstones is important for the safe geological disposal of radioactive waste. However, few in situ tracer migration tests have been conducted on fractures in mudstones. The Japan Atomic Energy Agency has conducted in situ tracer migration experiments using uranine, for fractures in siliceous mudstone of the Wakkanai Formation. 18 experiments were conducted under various conditions An injection flow rate that is slightly higher than the pumping flow rate is ideal for tracer migration experiments involving injection and pumping, as conducted in this study. In situ tracer migration experiments involving injection and pumping conducted in a groundwater environment with dissolved gases allow empirical evaluation of the relationship of the tracer recovery ratio and the groundwater degassing with the injection and pumping flow rate ratio. This evaluation is effective for the design of experimental conditions that account for degassing and ensure high levels of tracer recovery.

JAEA Reports

Horonobe Underground Research Laboratory Project; Synthesis of Phase II (Construction Phase) investigations to a depth of 350m

Sato, Toshinori; Sasamoto, Hiroshi; Ishii, Eiichi; Matsuoka, Toshiyuki; Hayano, Akira; Miyakawa, Kazuya; Fujita, Tomoo*; Tanai, Kenji; Nakayama, Masashi; Takeda, Masaki; et al.

JAEA-Research 2016-025, 313 Pages, 2017/03

JAEA-Research-2016-025.pdf:45.1MB

The Horonobe Underground Research Laboratory (URL) Project is being pursued by the Japan Atomic Energy Agency (JAEA) to enhance the reliability of relevant disposal technologies through investigations of the deep geological environment within the host sedimentary formations at Horonobe, northern Hokkaido. This report summarizes the results of the Phase II investigations carried out from April 2005 to June 2014 to a depth of 350m. Integration of work from different disciplines into a "geosynthesis" ensures that the Phase II goals have been successfully achieved and identifies key issues that need to made to be addressed in the Phase II investigations Efforts are made to summarize as many lessons learnt from the Phase II investigations and other technical achievements as possible to form a "knowledge base" that will reinforce the technical basis for both implementation and the formulation of safety regulations.

Journal Articles

Cross-checking groundwater age by $$^{4}$$He and $$^{14}$$C dating in a granite, Tono area, central Japan

Hasegawa, Takuma*; Nakata, Kotaro*; Tomioka, Yuichi*; Goto, Kazuyuki*; Kashiwaya, Koki*; Hama, Katsuhiro; Iwatsuki, Teruki; Kunimaru, Takanori*; Takeda, Masaki

Geochimica et Cosmochimica Acta, 192, p.166 - 185, 2016/11

 Times Cited Count:9 Percentile:35.91(Geochemistry & Geophysics)

Groundwater dating was performed simultaneously by the $$^{4}$$He and $$^{14}$$C methods in granite of the Tono area in central Japan. Groundwater was sampled at 30 packed-off sections of six 1000-m boreholes. $$^{4}$$He concentrations increased and $$^{14}$$C concentrations decreased along a groundwater flow path on a topographic gradient. $$^{4}$$He ages were calculated by using the in situ $$^{4}$$He production rate derived from the porosity, density, and U and Th content of the rock, neglecting external flux. The linear relation between the $$^{4}$$He ages and the noncorrected $$^{14}$$C ages, except in the discharge area. Simultaneous measurements make it feasible to estimate the accumulation rate of $$^{4}$$He and initial dilution of $$^{14}$$C, which cannot be done with a single method. Cross-checking groundwater dating has the potential to provide more reliable groundwater ages.

JAEA Reports

Synthesized research report in the second mid-term research phase, Mizunami Underground Research Laboratory Project, Horonobe Underground Research Laboratory Project and Geo-stability Project (Translated document)

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).

JAEA Reports

Borehole investigations data sheet in Horonobe Underground Research Center (HDB-1 to HDB-11)

Ono, Hirokazu; Takeda, Masaki; Matsuoka, Toshiyuki

JAEA-Data/Code 2015-021, 52 Pages, 2016/01

JAEA-Data-Code-2015-021.pdf:18.94MB
JAEA-Data-Code-2015-021-1-1appendix(CD-ROM).zip:14.52MB
JAEA-Data-Code-2015-021-1-2-1appendix(CD-ROM).zip:217.31MB
JAEA-Data-Code-2015-021-1-2-2appendix(CD-ROM).zip:296.07MB
JAEA-Data-Code-2015-021-1-2-3appendix(CD-ROM).zip:191.06MB
JAEA-Data-Code-2015-021-1-3appendix(CD-ROM).zip:74.64MB
JAEA-Data-Code-2015-021-1-4appendix(CD-ROM).zip:195.28MB
JAEA-Data-Code-2015-021-2appendix(CD-ROM).zip:0.12MB

HDB-1 to HDB-11 were drilled at Hokushin Area of Horonobe Town, Teshio District, Hokkaido, Japan in order to investigate the characteristic of deep underground. This report summarize the results of the work carried out with the purpose of clarifying the geological, mechanical characteristics from the surface to the deeper part of this borehole.

JAEA Reports

Monitoring of groundwater inflow into research galleries in the Mizunami Underground Research Laboratory Project (MIU Project); From fiscal year 2004 to 2011

Sato, Seiji; Ogata, Nobuhisa; Takeuchi, Ryuji; Takeda, Masaki

JAEA-Data/Code 2013-020, 38 Pages, 2014/01

JAEA-Data-Code-2013-020.pdf:12.13MB
JAEA-Data-Code-2013-020-appendix(CD-ROM).zip:1.41MB

The MIU Project has three overlapping phases: Surface-based Investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III). The MIU Project has been ongoing the Phase II and started the Phase III in 2010 fiscal year. One of the Phase II goals, which is for the project goal, was set to develop and revise models of the geological environment using the investigation results obtained during underground facilities excavation, and to determine and assess changes in the geological environment in response to excavation. The groundwater inflow monitoring into shafts and research galleries has been continued to achieve the Phase II goals. This document presents the results of the groundwater inflow monitoring from fiscal year 2004 to 2011.

JAEA Reports

Annual data compilation of water balance observation in the Regional Hydrogeological Study Project (RHS Project); For the fiscal year 2011

Sato, Seiji; Ogata, Nobuhisa; Takeuchi, Ryuji; Takeda, Masaki

JAEA-Data/Code 2013-017, 24 Pages, 2013/12

JAEA-Data-Code-2013-017.pdf:2.73MB
JAEA-Data-Code-2013-017-appendix(CD-ROM).zip:28.79MB

The Tono Geoscientific Research Unit of Japan Atomic Energy Agency (JAEA) has carried out the subsurface water balance observation in order to estimate groundwater recharge rate for setting the upper boundary conditions on groundwater flow simulation and to obtain data for calibration of hydrogeological model. In the subsurface water balance observations, precipitation data and river flow rate have been observed in the Garaishi River and the Hiyoshi River watersheds. The missed data and data error in the monitoring data during the fiscal year 2011 were complemented or corrected, and these data were compiled in data set.

JAEA Reports

Annual data compilation of water balance observation in the Mizunami Underground Research Laboratory Project (MIU Project); For the fiscal year 2010 to 2011

Sato, Seiji; Ogata, Nobuhisa; Takeuchi, Ryuji; Takeda, Masaki

JAEA-Data/Code 2013-016, 50 Pages, 2013/12

JAEA-Data-Code-2013-016.pdf:7.85MB
JAEA-Data-Code-2013-016-appendix(DVD-ROM).zip:514.1MB

The Tono Geoscientific Research Unit of Japan Atomic Energy Agency (JAEA) has carried out the subsurface water balance observation in order to estimate groundwater recharge rate for setting the upper boundary conditions on groundwater flow simulation and to obtain data for calibration of hydrogeological model. In the subsurface water balance observations, meteorological data, river flow rate, groundwater level and soil moisture to estimate precipitation and evapotranspiration have been observed in the Shoba River watershed, the Shoba River model watershed and MIU Construction Site. After missed data and data error in the monitoring data from the fiscal year 2010 to 2011 were complemented or corrected, the data was compiled in data set. Furthermore the groundwater recharge rates in the Hazama River watershed were calculated using the river flow rate data obtained from the environment survey in the MIU construction work from Fiscal year 2003 to 2011.

JAEA Reports

Annual data compilation of water balance observation in the Regional Hydrogeological Study Project (RHS Project); For the fiscal year 2010

Sato, Seiji; Takeda, Masaki; Takeuchi, Ryuji

JAEA-Data/Code 2013-003, 19 Pages, 2013/06

JAEA-Data-Code-2013-003.pdf:2.36MB
JAEA-Data-Code-2013-003-appendix(CD-ROM).zip:15.46MB

The Tono Geoscientific Research Unit of Japan Atomic Energy Agency (JAEA) has carried out the subsurface water balance observation in order to estimate groundwater recharge rate for setting the upper boundary conditions on groundwater flow simulation and to obtain data for the calibration of the hydrogeological model. In the subsurface water balance observations, rainfall data and river flow rate have been observed in the Garaishi river and the Hiyoshi river watersheds. The missed data and data error in the monitoring data during the fiscal year 2010 were complemented or corrected, and these data were compiled in data set. Both of the observation data and compiled data are included into the data set, and the data set is recorded on CD-ROM.

JAEA Reports

Annual data compilation of water balance observation in the Mizunami Underground Research Laboratory Project (MIU Project); From the fiscal year 2009

Takeda, Masaki; Takeuchi, Ryuji

JAEA-Data/Code 2012-016, 39 Pages, 2012/09

JAEA-Data-Code-2012-016.pdf:6.55MB
JAEA-Data-Code-2012-016-appendix(CD-ROM)-1.zip:76.62MB
JAEA-Data-Code-2012-016-appendix(CD-ROM)-2.zip:68.95MB

At the Tono Geoscientific Research Unit, the subsurface water balance observation has been carried out in order to estimate groundwater recharge rate for setting the upper boundary conditions on groundwater flow simulation and to obtain data for the calibration of the hydrogeological model. In the subsurface water balance observations, meteorological data, river flow rate, groundwater level and soil moisture to estimate precipitation and evapotranspiration have been observed in the Shoba river area, the Shoba river model area and MIU Construction Site. After missed data and data error in the monitoring data from the fiscal year 2009 were complemented or corrected, the data was compiled in data set. Both of the observation data and compiled data are included in the data set, and the data set is recorded on DVD-ROM.

JAEA Reports

Annual data compilation of water balance observation in the Regional Hydrogeological Study Project (RHS Project); For the fiscal year 2009

Takeda, Masaki; Takeuchi, Ryuji

JAEA-Data/Code 2012-015, 19 Pages, 2012/09

JAEA-Data-Code-2012-015.pdf:4.79MB
JAEA-Data-Code-2012-015-appendix(CD-ROM).zip:9.7MB

At the Tono Geoscientific Research Unit, the subsurface water balance observation has been carried out in order to estimate groundwater recharge rate for setting the upper boundary conditions on groundwater flow simulation and to obtain data for the calibration of the hydrogeological model. In the subsurface water balance observations, rainfall data and river flow rate have been observed in the Garaishi river area and the Hiyoshi river area. The missed data and data error in the monitoring data from the fiscal year 2009 were complemented or corrected, and these data were compiled in data set. Both of the observation data and compiled data are included in the data set, and the data set is recorded on DVD-ROM.

JAEA Reports

Mizunami Underground Research Laboratory Project, Annual report for fiscal year 2010

Kunimaru, Takanori; Mikake, Shinichiro; Nishio, Kazuhisa; Tsuruta, Tadahiko; Matsuoka, Toshiyuki; Ishibashi, Masayuki; Ueno, Takashi; Tokuyasu, Shingo; Daimaru, Shuji; Takeuchi, Ryuji; et al.

JAEA-Review 2012-020, 178 Pages, 2012/06

JAEA-Review-2012-020.pdf:33.16MB

Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) is pursuing a geoscientific research and development project namely the Mizunami Underground Research Laboratory (MIU) Project in crystalline rock environment in order to construct scientific and technological basis for geological disposal of High-level Radioactive Waste (HLW). The MIU Project has three overlapping phases: Surface-based Investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III). The MIU Project has been ongoing the Phase II. And Phase III started in 2010 fiscal year. This report shows the results of the investigation, construction and collaboration studies in fiscal year 2010, as a part of the Phase II based on the MIU Master Plan updated in 2002.

JAEA Reports

Mizunami Underground Research Laboratory Project; Results of the borehole investigations to understand the geological environment in and around the Main-shaft fault

Tsuruta, Tadahiko; Takeda, Masaki; Ueno, Takashi; Daimaru, Shuji; Tokuyasu, Shingo; Onoe, Hironori; Shingu, Shinya; Ishibashi, Masayuki; Takeuchi, Ryuji; Matsuoka, Toshiyuki; et al.

JAEA-Technology 2012-001, 134 Pages, 2012/03

JAEA-Technology-2012-001.pdf:41.2MB
JAEA-Technology-2012-001(errata).pdf:0.44MB
JAEA-Technology-2012-001-appendix(CD-ROM).pdf:6.37MB

Tono Geoscientific Research Unit of Japan Atomic Energy Agency (JAEA) is performing the Mizunami Underground Research Laboratory (MIU) project in order to establish comprehensive techniques for the investigation, analysis and assessment of the deep geological environment in fractured crystalline rock. The borehole investigations (two boreholes; 10MI22 borehole and 10MI23 borehole) have been carried out to obtain information on geological, hydrological and hydrochemical characteristics in and around the Main-shaft fault. These investigations provided that features of fracture and alteration on rock mass in and around the Main-shaft fault. Hydrological and hydrochemical properties based on the geological features were also obtained.

JAEA Reports

Annual data compilation of the water balance observation in the Mizunami Underground Research Laboratory Project (MIU Project); From the fiscal year 2008

Takeda, Masaki; Sato, Atsuya*; Takeuchi, Ryuji

JAEA-Data/Code 2011-007, 38 Pages, 2012/02

JAEA-Data-Code-2011-007.pdf:3.15MB
JAEA-Data-Code-2011-007-appendix(CD-ROM)-1.zip:79.71MB
JAEA-Data-Code-2011-007-appendix(CD-ROM)-2.zip:67.65MB

At the Tono Geoscientific Research Unit, the subsurface water balance observation has been carried out in order to estimate groundwater recharge rate for setting the upper boundary conditions on groundwater flow simulation and to obtain data for the calibration of the hydrogeological model. In the water balance observations, precipitation metrological data for the estimation of evapotranspiration, river flow rate, and groundwater table and soil moisture have been observed in the Sheba river area, the Sheba river model area and MIU Construction Site. After missed data and data error in the monitoring data from the fiscal year 2008 were complemented or corrected, the data was compiled in data set. Both of the observation data and compiled data are included in the data set, and the data set is recorded on DVD-ROM.

JAEA Reports

Annual data compilation of the water balance observation in the regional hydrogeological study project (RHS Project); For the fiscal year 2008

Takeda, Masaki; Sato, Atsuya*; Takeuchi, Ryuji

JAEA-Data/Code 2011-006, 21 Pages, 2012/02

JAEA-Data-Code-2011-006.pdf:2.98MB
JAEA-Data-Code-2011-006-appendix(CD-ROM).zip:22.23MB

At the Tono Geoscientific Research Unit, the subsurface water balance observation has been carried out in order to estimate groundwater recharge rate for setting the upper boundary conditions on groundwater flow simulation and to obtain data for the calibration of the hydrogeological model. In the water balance observations, precipitation metrological data for the estimation of river flow rate, and groundwater table have been observed in the Garaishi river area and the Hiyoshi river area. The missed data and data error in the monitoring data from the fiscal year 2008 were complemented or corrected the data was compiled in data set. Both of the observation data and compiled data are included in the data set, and the data set is recorded on DVD-ROM.

Journal Articles

Hydrogeological characterization based on long term groundwater pressure monitoring

Daimaru, Shuji; Takeuchi, Ryuji; Takeda, Masaki; Ishibashi, Masayuki

Proceedings of 13th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2010) (CD-ROM), p.149 - 158, 2010/10

no abstracts in English

JAEA Reports

Study on hydrogeology on the Mizunami Underground Research Laboratory Project annual report for fiscal year 2008

Takeuchi, Ryuji; Saegusa, Hiromitsu; Oyama, Takuya; Keya, Hiromichi; Sato, Atsuya; Kosaka, Hiroshi; Takeda, Masaki; Daimaru, Shuji; Takeuchi, Shinji

JAEA-Research 2010-018, 133 Pages, 2010/08

JAEA-Research-2010-018.pdf:28.5MB

The Mizunami Underground Laboratory Project is a comprehensive research project investigating the deep underground environment within crystalline rock. The project goals of the project from surface-based investigation phase (Phase I) through to operation phase (Phase III) are: to establish techniques for investigation, analysis and assessment of the deep geological environment, and to develop a range of engineering for deep underground application. Currently, the project is under the construction phase (Phase II). One of the Phase II goals, which is for the project goal, was set to develop and revise models of the geological environment using the investigation results obtained during excavation, and determine and assess changes in the geological environment in response to excavation. This document presents the overview of results of the research and development on "hydrogeology" performed in fiscal year 2008, with regard to the Phase II goal.

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