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JAEA Reports

Assessment of Heterogeneous Geological Environment Using Geostatistical Techniques; A Technical Report

Toida, Masaru*; Suyama, Yasuhiro*; Shiogama, Yukihiro*; Atsumi, Hiroyuki*; Abe, Yasunori*; Furuichi, Mitsuaki*

JNC TJ7410 2003-004, 351 Pages, 2003/02

JNC-TJ7410-2003-004.pdf:47.52MB

"Geoscientific research" at Tono are developing site investigation and assessment techniques in geological environment. One of their important themes is to establish rational methodology to reduce uncertainties associated with the understanding of geological environment, which often exhibits significant heterogeneity. Purpose of this study is to identify and evaluate uncertainties associated with the understanding of geological environment. Because it is useful to guide designing effective site investigation techniques to reduce the uncertainty. For this, a methodology of the uncertainty analysis concerning the heterogeneous geological environment has been developed. In this report the methodology has also been tested through an exercise attempted in Tono area to demonstrate its applicability. This report summarizes as follows: 1)The exercise shows that the methodology considered 'variability' and 'ignorance' can demonstrate its applicability at three-dimensional case. 2)The exercise shows that the methodology can identity and evaluate uncertainties concerning ground water flow associated with performance assessment. 3)Based on sensitivity analysis, it is possible for the methodology to support designs of the following stage investigations to reduce the uncertainties efficiently.

JAEA Reports

Study on synthesis of Geologocal Environment at Horonobe area; A Technical review

Toida, Masaru*; Suyama, Yasuhiro*; Shiogama, Yukihiro*; Atsumi, Hiroyuki*; Abe, Yasunori*; Furuichi, Mitsuaki*

JNC TJ5400 2003-003, 460 Pages, 2003/02

JNC-TJ5400-2003-003.pdf:81.56MB
JNC-TJ5400-2003-003(errata).pdf:0.08MB

In this study, through development of cnceptual models of geological environment based on those data, the flows from data collection to modeling, which have been constructed independently for each geological environment of geology / geological structure , hydrogeology, geochemistry of groundwater and rock mechanics , were synthesized , adn a systematic approach includeing process from investigation of geological environment to its modeling was established , which is expected to ensure objectivity and raceability of the design and safety assessment of a disposal system.

JAEA Reports

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.

JAEA Reports

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 2003-022, 213 Pages, 2003/01

JNC-TJ8400-2003-022.pdf:13.05MB

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.

JAEA Reports

None

Toida, Masaru*; Suyama, Yasuhiro*; Shiogama, Yukihiro*; *; *; Furuichi, Mitsuaki*

JNC TJ7440 2002-007, 269 Pages, 2002/03

JNC-TJ7440-2002-007.pdf:9.28MB

no abstracts in English

JAEA Reports

Full-scale demonstration of sealing technique in geological disposal, 2

Toida, Masaru*; Shiogama, Yukihiro*; Masumoto, Kazuhiko*; Suyama, Yasuhiro*; Abe, Yasunori*; Furuichi, Mitsuaki*; *

JNC TJ8400 2002-018, 159 Pages, 2002/02

JNC-TJ8400-2002-018.pdf:1.77MB

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, main and connecting tunnels and access tunnels) with an effective combination of engineered barriers such as buffers, backfilling materials, plugs and grout. It is necessary to ensure the long-term durability to isolate disposed wastes in the system. The results of the research works this year are as follows ; (1) Basic data could be measured in the tunnel sealing experiments at URL site for sealing performance as the result of seepage, swelling pressure, evaporation rate and tracer concentration in and around the plug with increase of chamber pressure. (2) The transport properties around the plug could be evaluated based on a comparison between the results of tracer test and numerical analysis. (3) The sealing concept of foreign countries could be reviewed to establish the Japanese sealing concept and to clarify the requirement for sealing technique. This work was performed by KAJIMA Corporation under contract with Japan Nuclear Cycle Development Agency.

JAEA Reports

Full-scale demonstration of Sealing Technique in Geological Disposal, 2

Toida, Masaru*; Shiogama, Yukihiro*; Masumoto, Kazuhiko*; Suyama, Yasuhiro*; Abe, Yasunori*; Furuichi, Mitsuaki*

JNC TJ8400 2002-017, 159 Pages, 2002/02

JNC-TJ8400-2002-017.pdf:60.88MB

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, main and connecting tunnels and access tunnels) with an effective combination of engineered barriers such as buffers, backfilling materials, plugs and grout. It is necessary to ensure the long-term durability to isolate disposed wastes in the system. The results of the research works this year are as follows ; (1) Basic data could be measured in the tunnel sealing experiments at URL site for sealing performance as the result of seepage, swelling pressure, evaporation rate and tracer concentration in and around the plug with increase of chamber pressure. (2) The transport properties around the plug could be evaluated based on a comparison between the results of tracer test and numerical analysis. (3) The sealing concept of foreign countries could be reviewed to establish the Japanese sealing concept and to clarify the requirement for sealing technique.

JAEA Reports

None

Toida, Masaru*; Shiogama, Yukihiro*; Masumoto, Kazuhiko*; Suyama, Yasuhiro; Abe, Yasunori*; Furuichi, Mitsuaki*

JNC TJ7440 2001-015, 103 Pages, 2001/03

JNC-TJ7440-2001-015.pdf:3.74MB

no abstracts in English

JAEA Reports

Full-scale demonstration of sealing technique in geological disposal

Toida, Masaru*; Shiogama, Yukihiro*; Masumoto, Kazuhiko*; Suyama, Yasuhiro*; Abe, Yasunori*; Furuichi, Mitsuaki*

JNC TJ8400 2001-019, 68 Pages, 2001/02

JNC-TJ8400-2001-019.pdf:9.26MB

no abstracts in English

JAEA Reports

Full-scale demonstration of sealing technique in geological disposal

Toida, Masaru*; Shiogama, Yukihiro*; Masumoto, Kazuhiko*; Suyama, Yasuhiro*; Abe, Yasunori*; Furuichi, Mitsuaki*

JNC TJ8400 2001-018, 212 Pages, 2001/02

JNC-TJ8400-2001-018.pdf:35.39MB

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 udergroud potential passages (disposal pits, disposal tunnels, main and connectimg tunnels and access tunnels) with an effective combination of engineered barriers such as buffers, backfilling materials, plugs alld grout. It is necessary to ensure the long-term durability to isolate disposed wastes in the system. The results of the research works this year are as follows; (1)It could be estimated in the tunnel sealing experiments at URL site that seepage, swelling pressure and tracer concentration in the plug were changed with increase of pressure. (2)The transport properties around the plug could be evaluated based on a comparison between the results of tracer test and numerical analysis.

JAEA Reports

None

Toida, Masaru*; Shiogama, Yukihiro*; Atsumi, Hiroyuki; Masumoto, Kazuhiko*; *; Abe, Yasunori*; Furuichi, Mitsuaki*

JNC TJ7440 2000-006, 137 Pages, 2000/02

JNC-TJ7440-2000-006.pdf:3.55MB

no abstracts in English

JAEA Reports

A study of ground water flow in Japan

Hibiya, Keisuke*; *; Shiogama, Yukihiro*; *; Masumoto, Kazuhiko*; Furuichi, Mitsuaki*; Saegusa, Hiromitsu

JNC TN7400 99-004, 314 Pages, 1999/03

JNC-TN7400-99-004.pdf:11.06MB

In order to understand groundwater flow in Japan, it is important to know the hydraulic gradient and the sea / fresh-water boundaly. In particular, the hydraulic gradient is required to estimate very slow groundwater flow at depth. Also, the location of the sea / fresh-water boundary is required to characterize groundwater flow near the coast. In this study, we obtained the above-mentioned data from a number of published papers, and tried to find the suitable method to help evaluating the groundwater flow model.

JAEA Reports

Investigation on sealing in geological disposal (II)

*; Toida, Masaru*; Shiogama, Yukihiro*; *; 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.

JAEA Reports

None

*; Toida, Masaru*; Shiogama, Yukihiro*; *; *; Fukazawa, E.*; Tanaka, M.*

PNC TJ1100 98-004, 88 Pages, 1998/02

PNC-TJ1100-98-004.pdf:2.89MB

None

JAEA Reports

None

*; Toida, Masaru*; Shiogama, Yukihiro*; *; *; Fukazawa, E.*; Tanaka, M.*

PNC TJ1100 98-003, 204 Pages, 1998/02

PNC-TJ1100-98-003.pdf:9.91MB

None

JAEA Reports

None

Hibiya, Keisuke*; *; Shiogama, Yukihiro*; Fukazawa, E.*; Taira, K.*; Yamamoto, M.*; Okutsu, Kazuo*

PNC TJ1100 97-004, 60 Pages, 1997/02

PNC-TJ1100-97-004.pdf:2.52MB

None

JAEA Reports

None

Hibiya, Keisuke*; *; Shiogama, Yukihiro*; Masumoto, Kazuhiko*; Fukazawa, E.*; Taira, K.*; Yamamoto, M.*

PNC TJ1100 97-003, 120 Pages, 1997/02

PNC-TJ1100-97-003.pdf:6.62MB

None

JAEA Reports

None

Hibiya, Keisuke*; Toida, Masaru*; Shiogama, Yukihiro*; *; Masumoto, Kazuhiko*; Furuichi, Mitsuaki*

PNC TJ1100 96-002, 85 Pages, 1996/03

PNC-TJ1100-96-002.pdf:3.13MB

None

JAEA Reports

None

Hibiya, Keisuke*; Toida, Masaru*; Shiogama, Yukihiro*; *; Masumoto, Kazuhiko*; Furuichi, Mitsuaki*

PNC TJ1100 96-001, 290 Pages, 1996/03

PNC-TJ1100-96-001.pdf:36.9MB

None

JAEA Reports

None

Aoki, Kenji*; Hibiya, Keisuke*; Shiogama, Yukihiro*; Toida, Masaru*; Fukazawa, E.*; Okutsu, Kazuo*; *

PNC TJ1100 95-002, 195 Pages, 1995/03

PNC-TJ1100-95-002.pdf:16.41MB

None

23 (Records 1-20 displayed on this page)