Analytical Assessment of Full-Scale Demonstration of Sealing Technique in Canadian Geological Disposal Facility

Toida, Masaru*; Sasakura, Takeshi*; Atsumi, Hiroyuki*; Suyama, Yasuhiro*; Kobayashi, Ichizo*; Kawabata, Junichi*; Ito, Keijiro*

JNC TJ8400 2003-088, 254 Pages, 2004/02

JNC-TJ8400-2003-088.pdf:9.59MB

To establish sealing technique suitable for geological environmental conditions of Japan, it is necessary to obtain data related with this sealing function through laboratory tests and in-situ tests. It also is necessary to put these data to practical use and to establish the estimating method of the sealing technique. Tunnnel sealing experiment, which has been carried out as a joint research between JNC and AECL at URL of AECL Canada, is arriving the final stage and fundamental data relating with the sealing function has almost obtained. This report deals with the total data processing and interpretation of the sealing test, as well as the numerical analysis and interpretation on tracer test results. Concrete plans for the disassembling and sampling of clay and concrete plugs, which is important for the evaluation of function of the sealing system, is also discussed.

Full-scale Demonstration of Sealing Technique in Geological Disposal(III)

Toida, Masaru*; Shiogama, Yukihiro*; Atsumi, Hiroyuki*; Suyama, Yasuhiro*; Kawabata, Junichi*; Ito, Keijiro*; Okutsu, Kazuo*

JNC TJ8400 2003-023, 60 Pages, 2003/01

JNC-TJ8400-2003-023.pdf:2.48MB

To establish sealing technique suitable for geological environmental conditions of Japan, it is necessary to obtain data related with this sealing function through laboratory tests and in-situ tests. It also is necessary to put these data to practical use and to establish the estimating method of the sealing technique. This report deals with the sealing function tests under heating condition of supplying water, following the pressurized tests of supplying water at the AECL in Canada until last year. These test results are reported here together with the data, interpretation and analysis of tracer test results. Information arrangement for the establishment of estimation method of sealing function is also performed.

Polarization transfer in the O() reaction at forward angles and structure of the spin-dipole resonances

Kawabata, Takahiro*; Ishikawa, Takatsugu*; Ito, M.*; Nakamura, M.*; Sakaguchi, Harutaka*; Takeda, H.*; Taki, T.*; Uchida, Makoto*; Yasuda, Yusuke*; Yosoi, Masaru*; et al.

Physical Review C, 65(6), p.064316_1 - 064316_12, 2002/06

https://doi.org/10.1103/PhysRevC.65.064316

no abstracts in English

Investigation on sealing in geological disposal (II)

*; Toida, Masaru*; Shiogama, Yukihiro*; Yasui, Shingo*; Kawabata, Junichi*; *; Tanaka, M.*

JNC TJ8400 99-055, 199 Pages, 1999/02

JNC-TJ8400-99-055.pdf:51.74MB

For the geological disposal of high level radioactive wastes, after placement of the wastes, it is necessary to close off (to be called "sealing" hereafter) the underground potential passages (disposal pits, disposal tunnels, liaison tunnel and construction tunnels) with an effective combination of engineered barriers such as buffers, backfilling materials, plugs and grout. It is necessary to ensure the long-term liability to isolate disposed wastes in the system. The results of the research works this year are as follows ; (1)To determine the deformation properties of unsaturated sand-bentonite mixture three cyclic triaxial tests were carried out. (2)The objectives are to discuss the design of tunnel sealing experiments at URL site. The results of research are about (a)instrumentation and monitoring, (b)tracer experiment.

Solute transport analysis using discrete fracture network model, 2

Atsumi, Hiroyuki*; Nakajima, Makoto*; Seno, Shoji*; Masumoto, Kazuhiko*; Kawabata, Junichi*; Onoe, Hironori; Kunimaru, Takanori; Sawada, Atsushi; Saegusa, Hiromitsu; Watanabe, Kunio*

no journal, , 

Solute transport conceptual models for crystalline rock environment is developed in the Mizunami Underground Research Laboratory (MIU) project conducted by Japan Atomic Energy Agency (JAEA) in order to construct scientific and technological basis for geological disposal of High-level Radioactive Waste (HLW). In this study, groundwater flow analysis and solute transport analysis are conducted to analyze factors in the solute transport behavior using hydro-geological model composed of channel network.

Study on characterization of mass transportation using discrete fracture network model, 2; Model development taking into account consistency among geological and hydrogeological parameters

Masumoto, Kazuhiko*; Atsumi, Hiroyuki*; Iwano, Keita*; Nakajima, Makoto*; Seno, Shoji*; Kawabata, Junichi*; Saegusa, Hiromitsu; Onoe, Hironori; Sawada, Atsushi

no journal, , 

no abstracts in English

Study on characterization of mass transportation using discrete fracture network model, 4; Amount of data from borehole investigations for model development

Atsumi, Hiroyuki*; Nakajima, Makoto*; Iwano, Keita*; Masumoto, Kazuhiko*; Seno, Shoji*; Kawabata, Junichi*; Ishibashi, Masayuki; Sasao, Eiji; Hosoya, Shinichi*

no journal, , 

no abstracts in English