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JAEA Reports

Study on geological environment model using geostatistics method (Joint research)

Honda, Makoto*; Sakurai, Hideyuki*; Suzuki, Makoto*; Iwasa, Kengo*; Matsui, Hiroya

JAEA-Research 2008-038, 73 Pages, 2008/06

JAEA-Research-2008-038.pdf:18.44MB

The purpose of this study is to develop a geostatistical procedure for modeling on geological environments and to evaluate quantitative relationship between amount of geological information and reliability of the models using data sets obtained in surface-based investigation phase (Phase 1) of the Horonobe Underground Research Laboratory Project. This study is a joint research with Shimizu Corporation carried out in four years from FY2003 to FY2006. In the first three years, by using the data sets obtained by the geological investigations in each FY, three dimensional models of the resistivity, the chemical composition of groundwater and the hydraulic conductivity were built and undated by the geostatistical method developed in this study. The relationship between the amount of information and the reliability of the models were demonstrated as well through comparisons of the models at each step which corresponds to the investigation stage in each FY. In FY2006, as a summary of this study in the final FY, to confirm the validity of the present method, the above three models were compared with models built by a conventional method. Relationship between the procedure of geological survey and the reliability of the models were also studied by newly computing three sets of models based on fictitious investigation plans, their procedures are different form the actual one, and comparing these four models.

JAEA Reports

Study on geological environment model using geostatistics method (Joint research)

Honda, Makoto*; Suzuki, Makoto*; Sakurai, Hideyuki*; Iwasa, Kengo*; Matsui, Hiroya

JAEA-Research 2007-028, 91 Pages, 2007/04

JAEA-Research-2007-028.pdf:17.93MB

The purpose of this study is to develop the geostatistical procedure for modeling geological environments and to evaluate the quantitative relationship between the amount of information and the reliability of the model using the data sets obtained in Phase 1 of the Horonobe Underground Research Laboratory Project. In FY 2006 research, the data obtained from the deep boreholes which were executed in FY 2005 were newly used in addition to the data sets used in the previous study. And the hydrogeological models were built by using the same geostatistical procedure developed in the previous study. The relationship between the amount of information and the reliability of the model was demonstrated as well through a comparison of the models at each step which corresponds to the investigation stage in each FY. Furthermore, in the case of hydro-chemical model, the modeling procedure was applied to each dissolved principal component and their characteristics of distribution were clarified.

Journal Articles

Study on the improvement in reliability of hydrogeological model through progress of investigation; An Example of geostatistical hydraulic conductivity model

Honda, Makoto*; Suzuki, Makoto*; Sakurai, Hideyuki*; Iwasa, Kengo*; Matsui, Hiroya

Dai-41-Kai Jiban Kogaku Kenkyu Happyokai Happyo Koenshu, p.51 - 52, 2006/07

no abstracts in English

Journal Articles

Geostatistical modeling of hydrogeological environment using resistivity distribution measured by various methods

Honda, Makoto*; Sakurai, Hideyuki*; Iwasa, Kengo*; Suzuki, Makoto*; Matsui, Hiroya

Heisei-18 Nendo (2006 Nen) Shigen, Sozai Gakkai Shunki Taikai Koenshu (I) Shigen Hen, p.49 - 52, 2006/03

no abstracts in English

JAEA Reports

Study on geological environment model using geostatic method

Honda, Makoto*; Suzuki, Makoto*; Sakurai, Hideyuki*; Iwasa, Kengo*; Matsui, Hiroya

JNC-TY5400 2004-001, 255 Pages, 2004/03

JNC-TY5400-2004-001.pdf:51.46MB

None

JAEA Reports

H12: Project to establish the scientific and technical basis for HLW disposal in Japan, Supporting report 1: Geological environment in Japan

; ; Shimizu, Kazuhiko; Miyahara, Kaname; ; Hasegawa, Hiroshi; Iwasa, Kengo

JNC-TN1410 2000-002, 391 Pages, 2000/04

JNC-TN1410-2000-002.pdf:21.18MB

The geological environment has two main functions in terms of ensuring the safety of geological disposal. One relates to the fundamental long-term stability of the site and the other to the properties of the host rock formations and groundwater which facilitate the emplacement and functioning of the engineered barrier system (EBS) and the natural barrier function. With these functions in mind, the feasibility of selecting a geological environment in Japan, which is appropriate for geological disposal, is discussed, based on findings obtained from case studies and field measurements. (Methodology Long-term stability of the geological environment) Japan is located in a tectonically active belt that surrounds the Pacific Ocean. Volcanism, earthquakes and crystal movements are features of such active belts and are more significant in Japan than in most other countries. Therefore, important natural phenomena to be examined in Japan include fault movement, volcanic activity, uplift/d

JAEA Reports

Design of the HLW buffer

; Fujita, Tomo; Taniguchi, Wataru; Iwasa, Kengo; Hasegawa, Hiroshi

JNC-TN8400 99-096, 23 Pages, 1999/12

JNC-TN8400-99-096.pdf:2.01MB

The Japan Nuclear Cycle Development Institute (JNC) has prepared a second progress report (entitled H12) on research and development for geological disposal of high-level waste (HLW) in Japan. H12 report consist of a Project Overview Report and three Supporting Reports which cover the three major fields described in the AEC Guidelines: (1)evaluation of the geological environment, (2)repository design and engineering technology, (3)performance assessment. This report is prepared to explain background information of buffer design which is descried in Supporting Report 2 (Repository Design and Engineering Technology). In buffer design of H12 report, the design requirements of the buffer are assumed and the relationship between buffer thickness and density was shown corresponding design requirement as an area map. This report describes the background information such as the numerical formulations, assumptions, engineering judgement and so on.

JAEA Reports

Fundamental properties of geoenvironment for design study of repository

Taniguchi, Wataru; Hasegawa, Hiroshi; Iwasa, Kengo; Sato, Toshinori

JNC-TN8400 99-053, 66 Pages, 1999/11

JNC-TN8400-99-053.pdf:4.27MB

To develop appropriate designs, as well as the manufacture, installation and construction technologies for the engineered barrier system and disposal facilities, it is necessary to evaluate physical properties of the rock mass that relate to mechanical stability analysis, thermal analysis, and seismic analysis (hereinafter referred to as "mechanical properties", "thermal properties", and "dynamic properties"). Since H3 Report, these physical properties have been broadly collected from the open literature, including field measurement data, as well as in-situ data obtained in the Tono area and at the Kamaishi Mine, in order to obtain more reliable data and to promote understanding of the deep geological environment for the purpose of design. These collected data have been added to databases on rock properties developed in H3. Thus, this report contains the upgraded databases on rocks, which include the features from a wide range of geological environments in Japan. In this report, rock types are classified into groups that have equivalent properties from the viewpoint of engineering, based on these databases of rocks. Then, design values of physical properties for the classified rock groups are determined by considering the correlation between each physical property. To date, the mechanical properties and thermal properties have been generally treated separately from each other. Here, the mechanical properties and thermal properties are determined by applying relationships between effective porosity and both mechanical and thermal properties. For the mechanical properties and dynamic properties, depth dependence are also taken into consideration.

JAEA Reports

Thermal analysis in the near field for geological disposal of high-level radioactive waste; Establishment of the disposal tunnel spacing and waste package pitch on the 2nd progress report for the geological disposal of HLW in Japan

Taniguchi, Wataru; Iwasa, Kengo

JNC-TN8400 99-051, 129 Pages, 1999/11

JNC-TN8400-99-051.pdf:9.53MB

For the underground facility of the geological disposal of high-level radioactive waste (HLW), the space is needed to set the engineered barrier, and the set engineered barrier and rock-mass of near field are needed to satisfy some conditions or constraints for their performance. One of the conditions above mentioned is thermal condition arising from heat outputs of vitrified waste and initial temperature at the disposal depth. Hence, it is needed that the temperature of the engineered barrier and rock mass is less degree than the constraint temperature of each other. Therefore, the design of engineered barrier and underground facility is conducted so that the temperature of the engineered barrier and rock mass is less degree than the constraint temperature of each other. One of these design is establishment of the disposal tunnel spacing and waste package pitch. In this report, thermal analysis is conducted to establish the disposal tunnel spacing and waste package pitch to satisfy the constraint temperature in the near field. Also, other conditions or constraints for establishment of the disposal tunnel spacing and waste package pitch are investigated. Then, design of the disposal tunnel spacing and waste package pitch, considering these conditions or constraints, is conducted. For the near field configuration using the results of the design above mentioned, the temperature with time dependency is studied by analysis, and then the temperature variation due to the gaps, that will occur within the engineered barrier and between the engineered barrier and rock mass in setting engineered barrier in the disposal tunnel or pit, is studied. At last, the disposal depth variation is studied to satisfy the temperature constraint in the near field.

JAEA Reports

Study on construction technology for repository

Tanai, Kenji; Iwasa, Kengo; Hasegawa, Hiroshi; Miura, K.*; Okutsu, Kazuo*; Kobayashi, Masaaki*

JNC-TN8400 99-046, 177 Pages, 1999/11

JNC-TN8400-99-046.pdf:6.03MB

For the construction of underground facilities comprising access tunnels, connecting tunnels, main tunnels and disposal tunnels, a large number of tunnels will be excavated in deep rock formations. These excavations will extend hundreds kilometers in total length. Therefore, special attention must be paid, to transporting large volume of debris, ventilation, emergency escape routes in case of accident, and other factors. In addition, special attention must also paid to potential accidents which might in underground excavations, including unstable facing phenomena (such as collapse and swelling of facing at weak layer sections), spring water flow resulting collapse of rock, gas eruption, and rock burst. While considering these factors to be emphasized during the construction of geological disposal facilities, the investigation reviewed the existing working methods on individual construction technologies of access tunnels, main tunnels, connecting tunnels, disposal tunnels, and disposal pit, based on the recognition that the present state deals with a wide range of geological environments, and conducted investigation about the construction methods for each tunnel on the basis current technologies, and described the outline of these methods. Furthermore, for the items to be particulaly emphasized on site characterization koko and siting data such as ground pressure and spring water, the investigation reviewed the current countermeasure works, and made survey on the phenomena appeared during actual tunnel construction works and their countermeasres, and carried out a study on effectiveness of these countermeasures. This constructing of disposal site in deep geological formations is basically possible by applying, or confirming, current excavation technologies for tunnels and underground facilities, A systematic construction system combines separate technologies relating to construction, (excavation technology, tunnel support work method, etc.). Such systems ...

JAEA Reports

Investigations on repository layouts

Tanai, Kenji; Iwasa, Kengo; Hasegawa, Hiroshi; Goke, Mitsuo*; Horita, Masakuni*; Noda, Masaru*

JNC-TN8400 99-044, 140 Pages, 1999/11

JNC-TN8400-99-044.pdf:7.85MB

This report consists of three items: (1)Study of the repository configuration, (2)Study of the surface facilities configuration for construction, operation and buckfilling, (3)Planning schedule, In the repository configuration, the basic factors influencing the design of the repository configuration are presented, and the results of studies of various possible repository configurations are presented for both hard and soft rock systems. Here, the minimum conditions regarding geological environment required to guide design are assumed, because it is difficult to determine the repository configuration without considering specific conditions of a disposal site. In the surface facility configuration, it is illustrated based on the results of construction, operation, buckfilling studies for underground disposal facility and EIS report of CANADA. In the schedule, the overall schedule corresponding to the repository layout is outlined in link with the milestone of disposal schedule set forth in the government's basic policy. The assumptions and the basic conditions are summarized to examine the General Schedule from start of construction to closure of a repository. This summaly is based on the technologies to be used for construction, operation and closure of a repository. The basic national policies form the framework for this review of the general schedule.

JAEA Reports

None

; ; Shimizu, Kazuhiko; Miyahara, Kaname; ; Iwasa, Kengo

JNC-TN1400 99-021, 559 Pages, 1999/11

JNC-TN1400-99-021.pdf:29.06MB

None

JAEA Reports

The Draft second progress report on research and development of HLW disposal in Japan H12 project for assessment for feasibility of HLW disposal in Japan/Supporting report 1/Geological environment in Japan

; ; Shimizu, Kazuhiko; Miyahara, Kaname; ; Hasegawa, Hiroshi; Iwasa, Kengo

JNC-TN1400 99-011, 431 Pages, 1999/05

JNC-TN1400-99-011.pdf:22.83MB

The Japan Nuclear Cycle Development Institute (JNC) was established on 1st October 1998 as the successor to the Power Reactor and Nuclear Fuel Development Corporation (PNC). In this report, PNC and JNC are referred to collectively as JNC. JNC is now preparing a second progress report (entitled H12) on research and development (R&D) for geological disposal of high-level radioactive waste (HLW) in Japan. H12 documents progress made since the publication of the first progress report (H3) in 1992 and will be presented to the Japanese Government for assessment by the year 2000. The purpose of the work was specified in a report published in April 1997 by the Advisory Committee on Nuclear Fuel Cycle Backend Policy of the Atomic Energy Commission (AEC). This report of AEC entitled "Guidelines on Research and Development Relating to Geological Disposal of High-Level Radioactive Waste in Japan" (AEC Guidelines) specified that the primary objective of H12 is to Present an outline of "the technica

JAEA Reports

None

; ; Shimizu, Kazuhiko; Miyahara, Kaname; ; Hasegawa, Hiroshi; Iwasa, Kengo

JNC-TN1400 99-008, 656 Pages, 1999/04

JNC-TN1400-99-008.pdf:34.68MB

None

Oral presentation

Development of an integrated resistivity model based on a geostatistics and estimation of solute concentration of groundwater, 1; A Validity study of the integrated resistivity model

Honda, Makoto*; Sakurai, Hideyuki*; Suzuki, Makoto*; Hokari, Toshiyuki*; Iwasa, Kengo*; Matsui, Hiroya; Sugita, Yutaka; Sanada, Hiroyuki

no journal, , 

no abstracts in English

Oral presentation

Development of an integrated resistivity model based on a geostatistics and estimation of solute concentration of groundwater, 2; A Case study on relationship between reliability of the models and investigation planning

Sakurai, Hideyuki*; Honda, Makoto*; Suzuki, Makoto*; Hokari, Toshiyuki*; Iwasa, Kengo*; Matsui, Hiroya; Sugita, Yutaka; Sanada, Hiroyuki

no journal, , 

no abstracts in English

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