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JAEA Reports

Assessment of heterogeneous geological environment at Tono -Japanese fiscal year 2004- (Contract research)

Toida, Masaru*; Suyama, Yasuhiro*; Mori, Takayuki*; Inaba, Takeshi*; Sasakura, Takeshi*; Atsumi, Hiroyuki*; Masumoto, Kazuhiko*; Kobayashi, Ichizo*; Iwano, Keita*; Furuichi, Mitsuaki*; et al.

JAEA-Research 2007-065, 210 Pages, 2007/09

JAEA-Research-2007-065-1.pdf:28.82MB
JAEA-Research-2007-065-2.pdf:42.37MB
JAEA-Research-2007-065-3.pdf:24.46MB
JAEA-Research-2007-065-4.pdf:48.78MB

"Geoscientific research" at the Tono Area is developing site investigation, characterization and assessment techniques for understanding of geological environment. Their important goals are to establish a methodology for analyzing uncertainties in heterogeneous geological environment and to develop investigation techniques for efficiently reducing the uncertainties. The current study proposes a new approach where all the possible options in the models and data-sets, which cannot be excluded in the light of the evidences available, are identified. This approach enables uncertainties associated with the understanding at a given stage of the site characterization to be made explicitly using an uncertainty analysis technique based on Fuzzy geostatistics. This approach supports the design of the following investigation stage and reduces the uncertainties efficiently. In FY H16 the technique has been tested through geological modelling and groundwater analyses with Tono Area case based on current knowledge, to demonstrate its applicability and to compile the knowledge / information required to describe the H17 report. This report can be summarized as follows: (1) The knowledge / information required to describe the heterogeneous characteristics was compiled and connected to uncertainties associated with the characterization of a geological environment using a synthesis diagram. (2) Methodologies for assignment and screening of parameters were developed by using Evidential Support Logic (ESL). (3) Applicability of the techniques could be confirmed with Tono Area case. (4) This report proposed a new methodology that integrates the technique into JAEA ordinary technique to good advantage in the geoscientific research project.

JAEA Reports

Assessment of Heterogeneous Geological Environment at Tono; A Technical Report

Toida, Masaru*; Suyama, Yasuhiro*; Inaba, Takeshi*; Sasakura, Takeshi*; Atsumi, Hiroyuki*; Tanaka, Toshiyuki*; Kobayashi, Ichizo*; Iwano, Keita*; Furuichi, Mitsuaki*

JNC TJ7400 2004-017, 521 Pages, 2004/02

JNC-TJ7400-2004-017.pdf:96.64MB

"Geoscientific research" at Tono is developing site investigation, characterization and assessment techniques for understanding of geological environment. Their important themes are to establish a methodology for analyzing uncertainties in heterogeneous geological environment and to develop investigation techniques for reducing the uncertainties efficiently. The current study proposes a new approach where all the possible options in the models and data-sets that cannot be excluded in the light of the evidence available is identified. This approach enables uncertainties associated with the understanding at a given stage of the site characterization to be made explicitly using an uncertainty analysis technique based on Fuzzy geostatistics. This, in turn, supports the design of the following investigation stage to reduce the uncertainties efficiently. In this report the technique has been tested through geological modelling and groundwater analysis with Tono area case based on current knouledge, to demonstrate its applicability. This report summarizes as follows: (1)It is possible to quantify the uncertainties with Tono area case based on current knouledge using the technique. (2)Based on sensitivity analyses, it is possible to support designs of the following investigation stage to reduce the uncertainties efficiently. (3)The methodology of the technique has been developed with Tono area case. (4)The above could evaluate its applicability and propose further issues for synthesis of the methodology.

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

Feasibility study on construction of Horonobe URL

Kubota, Shigeru*; *; Noda, Masaru*; Furuichi, Mitsuaki*; *

JNC TJ1400 2002-003, 1053 Pages, 2003/02

JNC-TJ1400-2002-003.pdf:55.13MB

none

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

Investigation on sealing technique in geological disposal

Furuichi, Mitsuaki*; Toida, Masaru*; Masumoto, Kazuhiko*

JNC TJ8400 2000-021, 196 Pages, 2000/02

JNC-TJ8400-2000-021.pdf:23.23MB

For the geological disposal of high level radioactive wastes, after placement of tbe 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)The objectives are to discuss the design of tunnel sealing experiments at URL site. The results of research were about (a)tracer experiment and numerical analysis (b)evaporation measurement (c)presentation at the coordination meeting (2)The discussion was about the equipment of inclined compaction methods and bearing capacity of rock against pressures for the concrete plugs.

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

Backfilling of the underground facilities on a disposal site

Sugita, Yutaka; Fujita, Tomo; Tanai, Kenji; Hasegawa, Hiroshi; Furuichi, Mitsuaki*; Okutsu, Kazuo*; Miura, K.*

JNC TN8400 99-039, 58 Pages, 1999/11

JNC-TN8400-99-039.pdf:3.19MB

Regarding disposal techniques of high-level radioactive waste (HLW), the HLW is vitrified and then stored for cooling for a period of 30 to 50 years. After cooling, the HLW is isolated in the deep underground. The concept of geological disposal is based on the requirement to enclose the HLW in the deep underground for the long-term durability of the human's environmental safety. Backfilling of a repository is a unique activity on the geological disposal. If underground tunnels excavated to construct the repository are left, they may have significant influences on the barrier performance of an entire repository, such as: the mechanical stability of a tunnel may be damaged by rock stresses and a tunnel may provide a fast pathway for ground water flow. Therefore, the underground facilities are expected to be backfilled with a backfilling material after emplacement of the HLW and a buffer material. The material for the backfilling of the underground facilities is backfilling material. In this report, bentonite-aggregate mixture is considered, as one of the candidate materials for the backfilling material. Aggregate imitates the muck that is generated during construction phase of the underground facilities. The combination of backfilling, plugging and grouting is considered in some underground situations. Plug is composed of concrete material or clay-based one. Grouting material is concrete material or clay-based one, too. In this report, the concept of the backfilling, mechanical and hydrological characteristics of the bentonite-aggregate mixture, the function, work methods and a schedule of the backfilling materials, plugging and grouting are considered, and items of quality control for the bentonite-aggregate mixture, concrete material and grouting are listed.

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

None

Fukazawa, E.*; Tanaka, M.*; Yamamoto, H.*; Taira, K.*; Yamamoto, M.*; Okutsu, Kazuo*; Hane, Koji*; Aoyagi, Takayoshi*; Morikawa, Seiji*; Furuichi, Mitsuaki*

PNC TJ1100 98-007, 60 Pages, 1998/02

PNC-TJ1100-98-007.pdf:4.47MB

None

JAEA Reports

None

Fukazawa, E.*; Tanaka, M.*; Yamamoto, H.*; Taira, K.*; Yamamoto, M.*; Okutsu, Kazuo*; Hane, Koji*; Aoyagi, Takayoshi*; Morikawa, Seiji*; Furuichi, Mitsuaki*

PNC TJ1100 98-006, 415 Pages, 1998/02

PNC-TJ1100-98-006.pdf:17.61MB

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

A Study on the long-range dynamic phenomena of engineered barieer for transuranic radioactive waste isolation system

Abe, H.*; Fukazawa, E.*; Taira, K.*; Tanaka, Toshiyuki*; Shimizu, Y.*; Okutsu, Kazuo*; Shiozaki, N.*; Furuichi, Mitsuaki*

PNC TJ1100 95-004, 114 Pages, 1995/03

PNC-TJ1100-95-004.pdf:3.51MB

None

27 (Records 1-20 displayed on this page)