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14MI51 Boreholes)Kuroiwa, Hiroshi*; Kawamoto, Koji; Yamada, Nobuto; Sasao, Eiji
JAEA-Data/Code 2015-003, 108 Pages, 2015/06
JAEA-Data-Code-2015-003.pdf:10.4MBJAEA-Data-Code-2015-003(errata).pdf:1.51MB
JAEA-Data-Code-2015-003-appendix(CD-ROM).zip:1150.87MB
Japan Atomic Energy Agency (JAEA) is performing the Mizunami Underground Research Laboratory (MIU) Project, which is a scientific study of the deep geological environment as a basis of research and development for geological disposal of high level radioactive wastes (HLW), in order to establish comprehensive techniques for the investigation, analysis and assessment of the deep geological environment in the crystalline rock. The MIU Project has three overlapping phases, Surface-based investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III). This report compiles the data of results from borehole investigations which has been carried out in the research gallery in the fiscal year from 2012 to 2014. These data include results of core observation, geophysical logging, and so on.
Kawamoto, Koji; Kuroiwa, Hiroshi; Yamada, Nobuto; Onuki, Kenji; Omori, Kazuaki; Takeuchi, Ryuji; Ogata, Nobuhisa; Omori, Masaki; Watanabe, Kazuhiko
JAEA-Technology 2014-011, 92 Pages, 2014/07
JAEA-Technology-2014-011.pdf:24.65MBJAEA-Technology-2014-011-appendix(DVD).zip:331.54MB
This document summarizes the data of pilot boreholes (12MI32) in the -500m Access/Research Gallery-South. The geological, hydraulic and geochemical data were obtained. In addition, groundwater monitoring system was installed to observe the groundwater pressure in initial condition and change during the excavation of gallery. The results of investigation, biotite granite with medium to coarse-grained equigranular texture are characterized. Rock mass classification is B from CM class. Minor fault with fault breccia are observed around 48.90mabh. However, S200_13 fault and IF_SB3_13_3 fault (that were presumed by an original model) were not observed. Density of fracture is large in the section of 40.00 to 80.00mabh. Water inflow was a maximum of 600 L/min in 78.83mabh. Permeability ranges from 2.0E-9 to 1.5E-08m/sec at the zone with low inflow, from 1.1E-05 to 1.6E-05m/sec at the zone with high inflow, respectively. Groundwater chemistry is rich in Na and Cl ion.
Tsuyuguchi, Koji; Kuroiwa, Hiroshi; Kawamoto, Koji; Yamada, Nobuto; Onuki, Kenji; Iwatsuki, Teruki; Takeuchi, Ryuji; Ogata, Nobuhisa; Suto, Masahiro; Mikake, Shinichiro
JAEA-Technology 2013-044, 89 Pages, 2014/02
JAEA-Technology-2013-044.pdf:11.09MBJAEA-Technology-2013-044-appendix(CD-ROM).zip:316.8MB
This document summarizes the data of pilot boreholes (12MI27, 12MI33) in the -500m Access/Research Gallery-North. The geological, hydraulic and geochemical data were obtained. In addition, groundwater monitoring system was installed in closure test gallery for the flooding test in phase III research. The results of investigation, biotite granite with medium to coarse-grained equigranular texture are characterized. Rock mass classification is B from CH class. Minor fault with fault gouge that was not presumed by an original model are observed in 12MI33. Density of fracture in 12MI27 near the Main-shaft fault tends to be compared to 12MI33. Water inflow in both boreholes is less. Permeability ranges from 4.8E-10 to 6.1E-09m/sec at the zone without alteration and with low inflow, from 1.1E-07 to 2.7E-07m/sec at the zone without alteration and with high inflow, respectively. Groundwater chemistry is rich in Na and Cl ion.
Murai, Yuichi*; Oiwa, Hiroshi; Sasaki, Toshio*; Kondo, Masahiko; Yoshikawa, Shinji; Yamamoto, Fujio*
Measurement Science and Technology, 16(7), p.1459 - 1468, 2005/07
Times Cited Count：31 Percentile：81.42(Engineering, Multidisciplinary)Air-water two-phase flow in a helically coiled tube is investigated using backlight imaging tomography to elucidate the effect of centrifugal acceleration on phase distribution and interfacial structure. Superficial velocities up to 6m/s in 20mm-diameter tube are tested. We focused on a slug flow regime in which centrifugal acceleration dominates the flow. The interfacial structure is visualized in six directions using a set of originally designed mirror-mounted water jackets. A temporal expansion image is made from line-sampled images, and is used to reconstruct phase distribution through a linear backward projection algorithm. The present topography measurement showed various new features of gas-liquid two-phase flow in a helically coiled tube, such as a wall-covering effect in the case of high superficial velocity.
Oiwa, Hiroshi; Murai, Yuichi*; Sasaki, Toshio*; Yoshikawa, Shinji; Yamamoto, Fujio*
Proceedings of 4th World Congress on Industrial Process Tomography, Vol.1, p.428 - 433, 2005/00
We carried out reflection seismic and multi-offset VSP surveys at JNC Shobasama-site to develop the investigation technique in the granite area, and evaluated the applicability of these geophysical methods. As the result of this study, we consider that a) It is possible to infer the existence of the lower angle fracture zone in the granite by eflection seismic survey and b) Multi-offset VSP supplements the result of reflection seismic survey and it is possible to infer the distribution of the fracture zone in deeper area in the granite.
Murai, Yuichi*; Yamamoto, Fujio*; Ishikawa, Masaaki*; Sakai, Kosuke*; Oiwa, Hiroshi*; Toda, Shinichi; Yoshikawa, Shinji; Tamayama, Kiyoshi
JNC TY4400 2003-006, 75 Pages, 2003/06
JNC-TY4400-2003-006.pdf:12.95MB
None
Oiwa, Hiroshi
no journal, ,
no abstracts in English
Oiwa, Hiroshi; Murai, Yuichi*; Yoshikawa, Shinji
no journal, ,
Helically coiled type steam generator is used in Fast Breeder Reactor "Monju". The characteristics of this steam generator is affected by the centrifugal acceleration due to curvature of the heat transfer tube. The centrifugal acceleration forces the liquid phase to the wall of the tube. This phenomenon suppresses the rapid boiling that may induce the hydrodynamic oscillation. In this study, the effect of centrifugal acceleration and inlet conditions of the fluid is investigated by experiment using backlight imaging tomography and numerical simulation using CIP-level set method. We focused on a slug flow regime in which centrifugal acceleration dominates the flow. The present study showed two types of the centrifugal acceleration effects. One is the effect that holds the liquid phase near the tube wall, and another is the liquid-covering effect on the wall by secondary flow.
Oiwa, Hiroshi
no journal, ,
no abstracts in English
Oiwa, Hiroshi; Yoshikawa, Shinji
no journal, ,
Helically coiled heat transfer tubes are used in the steam generator of Fast Breeder Reactor "Monju". The characteristics of this steam generator is affected by the centrifugal acceleration due to curvature of the heat transfer tube. The centrifugal acceleration forces the liquid phase to the wall of the tube. This phenomenon suppresses the rapid boiling that may induce the hydrodynamic oscillation. In this study, the effect of centrifugal acceleration and inlet conditions of the fluid is investigated by numerical simulation using CIP-level set method. We focused on the slug flow regime in which centrifugal acceleration dominates the flow. The present study showed two types of the centrifugal acceleration effects. One is the effect that holds the liquid phase near the tube wall, and another is the liquid-covering effect on the wall by secondary flow.
Ishibashi, Masayuki; Kawamoto, Koji; Kuboshima, Koji; Kuroiwa, Hiroshi; Sasao, Eiji; Tsuruta, Tadahiko; Matsuoka, Toshiyuki
no journal, ,
no abstracts in English
Iwatsuki, Teruki; Sato, Toshinori; Takeuchi, Ryuji; Onoe, Hironori; Onuki, Kenji; Saegusa, Hiromitsu; Hasegawa, Takashi; Kuroiwa, Hiroshi; Tsuyuguchi, Koji; Ikeda, Koki; et al.
no journal, ,
Closure experiment of gallery of MIU is planned to understand the recovery process of geological environments after the closure. Flooding test gallery and monitoring boreholes are designed at 500 m access gallery to observe recovery of water pressure, chemistry around cement and burial materials, rock stress. Evaluation of numerical analysis methods on hydraulic, chemical and mechanical change will be conducted based on the results of upcoming closure experiment.
Sasao, Eiji; Yamada, Nobuto; Kuroiwa, Hiroshi; Kuboshima, Koji; Kawamoto, Koji; Ishibashi, Masayuki; Tsuruta, Tadahiko; Matsuoka, Toshiyuki; Murakami, Hiroaki
no journal, ,
no abstracts in English
