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JAEA Reports

Horonobe Underground Research Laboratory project overview of the pilot borehole investigation of the ventilation shaft (PB-V01); Geological investigation

Funaki, Hironori; Tokiwa, Tetsuya; Ishii, Eiichi; Hatsuyama, Yoshihiro*; Matsuo, Shigeaki*; Tsuda, Kazuyasu*; Koizumi, Akira*; Ishikawa, Taiki*; Daijo, Yuichi*; Sugiyama, Kazutoshi*

JAEA-Data/Code 2008-013, 65 Pages, 2008/08

JAEA-Data-Code-2008-013.pdf:6.38MB

We conducted geological investigation of the pilot borehole of the ventilation shaft in Horonobe during October 2007 and March 2008. This report describes the field operations (core description, core photograph, and core sampling) and laboratory measurements (modal analysis and X-ray diffraction analysis), equipments as well as processing procedures, and shows the obtained results. The information obtained from this investigation will be reflected in spring water control plan on shaft excavation and additional plan of drainage treatment facilities.

Journal Articles

Three-dimensional distribution and hydrogeological properties of the Omagari fault in the Horonobe area, northern Hokkaido, Japan

Ishii, Eiichi; Yasue, Kenichi; Tanaka, Takenobu*; Tsukui, Rota; Matsuo, Koichi*; Sugiyama, Kazutoshi*; Matsuo, Shigeaki*

Chishitsugaku Zasshi, 112(5), p.301 - 314, 2006/05

Fault zones have significant influences on ground water flow. It is important to understand the characteristics of fault zones for hydrogeological modeling. We investigated the hydrogeological property and the geological structure of the fault in Neogene siliceous sedimentary rocks of northern Hokkaido, using geological mappings, reflection seismic surveys, and audio-frequency magneto telluric surveys. The result of description at a fault outcrop suggests that the Omagari Fault is a fault zone of about 120 m width that consists of mainly damage zone and that is a permeable structure without the strong anisotropy in permeability. In addition, the result of magneto telluric surveys shows high-resistivity zones having a flower structure, and one of the high-resistivity zones corresponds to the position of the Omagari fault inferred from the results of the reflection seismic surveys and of the borehole investigations. These high resistivity zones overlap with the low saline concentration zones, and the overlapping suggests the infiltration of the fresh water from the surface into the deeper part through the Omagari Fault as permeable structures. Based on these results and on study of the hydrogeological property, the geological structure, and petrological characteristics in and around the fault, it seems that the fault is a sinistral oblique-slip fault with eastside uplift sense that is formed after late Pliocene to early Pleistocene, but the possibility of the previous activity needs to research, and that the fault is over-stepping at the surface and is converging in deep underground like a flower structure shape.

Oral presentation

Studies on coupled behavior of the high-level radioactive waste repository

Sasamoto, Hiroshi; Sazarashi, Masami; Ishii, Tomoko*; Kato, Hiroyasu*; Sugiyama, Kazutoshi*

no journal, , 

Regarding to alteration of bentonite coexisting with iron material, laboratory experiments with different temperature and iron-bentonite (I/B) ratio and literature surveys for bentonite alteration in the natural system were conducted. As the results, the conditions which promote the alteration of smectite significantly were estimated approximately. Additionally, the important alteration products necessary for evaluation of smectite alteration were summarized by literature surveys. Such information will be useful for evaluation of smectite alteration considering the conditions of time and duration interested.

Oral presentation

Measurement technology of uranium quantity in uranium waste, 3; Evaluation of relative error and detection limit using simulated waste

Yokoyama, Kaoru; Sugitsue, Noritake; Suzuki, Yasuo*; Muroi, Masayuki*; Nakatsuka, Yoshiaki; Ishii, Kazuto*

no journal, , 

The computational technique using the $$gamma$$ ray of two energies emitted from $$^{238}$$U progeny nuclide ($$^{rm 234m}$$Pa) was developed to determine uranium quantity in heterogeneous waste. In this study, the relative error and detection limit evaluation results using the simulated wastes are reported.

Oral presentation

Development of method to measure elemental distributions of Cs and Rb in an ear of rice by micro-PIXE

Koshio, Shigeki*; Ito, Shun*; Ishii, Keizo*; Matsuyama, Shigeo*; Terakawa, Atsuki*; Sata, Daichi*; Toyama, Sho*; Kasahara, Kazuto*; Kubo, Ryosuke*; Koka, Masashi; et al.

no journal, , 

no abstracts in English

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