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Onoe, Hironori; Takeuchi, Ryuji
JAEA-Data/Code 2020-010, 112 Pages, 2020/10
JAEA-Data-Code-2020-010.pdf:6.22MB
JAEA-Data-Code-2020-010-appendix1(DVD-ROM).zip:169.12MBJAEA-Data-Code-2020-010-appendix2(DVD-ROM).zip:338.45MBJAEA-Data-Code-2020-010-appendix3(DVD-ROM).zip:448.05MB
The Mizunami Underground Research Laboratory (MIU) Project has three overlapping phases: Surface-based Investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III), the project is being carried out under the Phase III. The main goals of the MIU Project from Phase I to Phase III are: to establish techniques for investigation, analysis and assessment of the deep geological environment, and to develop a base of engineering for deep underground application. One of the Phase III goals is to construct geological environment models and grasp deep geological changes when expanding the research gallery by research and investigations using research galleries. The long term hydro-pressure monitoring has been continued to achieve the Phase III goals. Furthermore, these monitoring were ceased at the end of FY2019 due to the completion of the MIU project. This report describes the results of the long term hydro-pressure monitoring from April 2017 to March 2020.
Onoe, Hironori; Takeuchi, Ryuji
JAEA-Data/Code 2020-008, 41 Pages, 2020/08
JAEA-Data-Code-2020-008.pdf:3.14MBJAEA-Data-Code-2020-008-appendix(CD-ROM).zip:93.51MB
Japan Atomic Energy Agency (JAEA) has been conducting a wide range of geoscientific research in order to build scientific and technological basis for geological disposal of nuclear wastes. This study aims to establish comprehensive techniques for the investigation, analysis and assessment of the deep geological environment in fractured crystalline rock. The Regional Hydrogeological Study (RHS) project is a one of the geoscientific research program at Tono Geoscience Center. This project started since April 1992 and main investigations were finished to FY2004. Since FY2005, hydrogeological and hydrochemical monitoring have been continued using the existing monitoring system. Furthermore, these monitoring were ceased at the end of FY2019 due to the completion of the RHS project. This report describes the results of the long term hydro-pressure monitoring for FY2019.
Keya, Hiromichi; Takeuchi, Ryuji; Iwatsuki, Teruki
JAEA-Data/Code 2018-020, 58 Pages, 2019/03
JAEA-Data-Code-2018-020.pdf:3.19MBJAEA-Data-Code-2018-020-appendix1(CD-ROM).zip:203.36MBJAEA-Data-Code-2018-020-appendix2(CD-ROM).zip:168.01MB
A wide range of geoscientific research aims to establish comprehensive techniques for the investigation, analysis and assessment of the deep geological environment in fractured crystalline rock. The Regional Hydrogeological Study (RHS) project is a one of the geoscientific research program at Tono Geoscience Center. This project started since April 1992 and main investigations were finished to March 2004. Since 2005, hydrogeological and hydrochemical monitoring have been continued using the existing monitoring system. This report describes the results of the long term hydro-pressure monitoring from April 2015 to March 2017.
Keya, Hiromichi; Takeuchi, Ryuji; Iwatsuki, Teruki
JAEA-Data/Code 2018-019, 107 Pages, 2019/03
JAEA-Data-Code-2018-019.pdf:11.01MBJAEA-Data-Code-2018-019-appendix1(DVD-ROM).zip:419.48MBJAEA-Data-Code-2018-019-appendix2(DVD-ROM).zip:374.0MBJAEA-Data-Code-2018-019-appendix3(DVD-ROM).zip:312.2MB
The MIU Project has three overlapping phases: Surface-based Investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III), the project is being carried out under the Phase III. The main goals of the MIU Project from Phase I to Phase III are: to establish techniques for investigation, analysis and assessment of the deep geological environment, and to develop a base of engineering for deep underground application. One of the Phase III goals is to construct geological environment models and grasp deep geological changes when expanding the research gallery by research and investigations using research galleries. The long term hydro-pressure monitoring has been continued to achieve the Phase III goals. This report describes the results of the long term hydro-pressure monitoring from April 2015 to March 2017.
Mezawa, Tetsuya; Mochizuki, Akihito; Miyakawa, Kazuya; Sasamoto, Hiroshi
JAEA-Data/Code 2017-010, 63 Pages, 2017/06
JAEA-Data-Code-2017-010.pdf:9.66MBJAEA-Data-Code-2017-010-appendix(CD-ROM).zip:5.08MB
Japan Atomic Energy Agency (JAEA) has been conducting "geoscientific study" and "research and development on geological disposal" in the Horonobe Underground Research Laboratory (URL) for safe geological disposal of high-level radioactive waste. Geochemical parameters of groundwater pressure, pH, and oxidation-reduction potential in the deep groundwater has been continuously monitored by the monitoring system which was developed in the Horonobe URL Project. This report presents the data of groundwater pressure which have been obtained by the monitoring system installed at the 140 m and 350 m gallery. The data obtained until March 31, 2016 was summarized along with related information such as the specifications of boreholes and the excavation of the URL.
; ; Koide, Kaoru; Yanagizawa, Koichi
PNC TN7410 95-012, 65 Pages, 1995/05
An extensive study program has been carried out by PNC to estimate hydrogeological characteristics of deep underground in Japan. As a part of this program, groundwater flow analyses in Hokkaido were conducted. For the analyses of Hokkaido area (500 km 
400 km 10 km deep), a hydrogeological model representing topography, distribution of hydraulic conductivity was developed on the strength of information available from open literature. By the use of this model, steady state three-dimensional groundwater flow under a saturated-unsaturated condition was calculated by means of finite element method. The results are as follows : (1)Distribution of piezometric head corresponds with topography in the study area. (2)Piezometric head distribution is hydrostatic below E.L.-1000 m in the study area. (3)Hydraulic gradient in the study area is less than 0.04 below E.L. -500 m. (4)Difference of boundary conditions at the shore side this model does not affect the result of the analyses.
Horita, M.*; Furuichi, Mitsuaki*; Ito, K.*; Sudo, Ken*
PNC TJ7449 91-001VOL2, 406 Pages, 1991/05
PNC-TJ7449-91-001VOL2.pdf:11.33MB
no abstracts in English
Horita, M.*; Furuichi, Mitsuaki*; Ito, K.*; Sudo, Ken*
PNC TJ7449 91-001VOL1, 406 Pages, 1991/05
PNC-TJ7449-91-001VOL1.pdf:3.51MB
no abstracts in English
Suemitsu, Akinobu*; Masumoto, Kiyoshi*; Onoe, Hironori
no journal, ,
no abstracts in English
Takayasu, Kentaro; Keya, Hiromichi; Onoe, Hironori; Takeuchi, Ryuji
no journal, ,
The reflood test which fills the part of the tunnel of depth 500m with groundwater is being put into effect for the purpose of exemplification of the recovery ability of the geological environment in the bedrock which was disturbed by construction and operation of large-scale underground facilities, and development of observation and evaluation technique of geological environment recovery at The Mizunami Underground Research Laboratory (MIU). Water pressure observation devices were installed in the tunnel and in each observation section in the surrounding bedrock, and groundwater pressure change in this test was observed. Similarity of water pressure change between the tunnel and each observation section was considered by arranging observed water pressure change data as derivative plots and focusing their shapes.
Onoe, Hironori; Takayasu, Kentaro; Hayashida, Kazuki; Takeuchi, Ryuji; Iwatsuki, Teruki
no journal, ,
no abstracts in English