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Fujita, Tomoo; Tanai, Kenji; Nakayama, Masashi; Sawada, Sumiyuki*; Asano, Hidekazu*; Saito, Masahiko*; Yoshino, Osamu*; Kobayashi, Masato*
JAEA-Research 2014-031, 44 Pages, 2015/03
JAEA-Research-2014-031.pdf:16.11MB
Japan Atomic Energy Agency (JAEA) and Radioactive Waste Management Funding and Research Center (RWMC) concluded the letter of cooperation agreement on the research and development of radioactive waste disposal in April, 2005, and have been carrying out the collaboration work based on the agreement. JAEA have been carrying out the Horonobe Underground Research Laboratory (URL) Project which is intended for a sedimentary rock in the Horonobe town, Hokkaido, since 2001. In the project, geoscientific research and research and development on geological disposal technology are being promoted. Meanwhile, the government (the Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry) has been promoting construction of equipments for the full-scale demonstration of engineered barrier system (EBS) and operation technology for high-level radioactive waste (HLW) disposal since 2008, to enhance public's understanding to the geological disposal of HLW, e.g. using underground facility. RWMC received an order of the project in fiscal year 2012 (2011/2012) continuing since fiscal year 2008 (2008/2009). Since topics in this project are included in the Horonobe URL Project, JAEA carried out this project as collaboration work continuing since fiscal year 2008. This report summarizes the results of engineering technology carried out in this collaboration work in fiscal year 2013. In fiscal year 2013, emplacement tests using buffer material block for the vertical emplacement concept were carried out and visualization tests for water penetration in buffer material were carried out.
Nakatsuka, Noboru; Sato, Haruo; Tanai, Kenji; Nakayama, Masashi; Sawada, Sumiyuki*; Asano, Hidekazu*; Saito, Masahiko*; Yoshino, Osamu*; Tsukahara, Shigeki*; Hishioka, Sosuke*; et al.
JAEA-Research 2013-034, 70 Pages, 2014/01
JAEA-Research-2013-034.pdf:9.11MB
Japan Atomic Energy Agency (JAEA) and Radioactive Waste Management Funding and Research Center (RWMC) concluded the letter of cooperation agreement on the research and development of radioactive waste disposal in April, 2005, and have been carrying out the collaboration work based on the agreement. JAEA have been carrying out the Horonobe Underground Research Laboratory (URL) Project which is intended for a sedimentary rock in the Horonobe town, Hokkaido, since 2001. In the project, geoscientific research and research and development on geological disposal technology are being promoted. Meanwhile, the government (the Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry) has been promoting construction of equipments for the full-scale demonstration of engineered barrier system and operation technology for high-level radioactive waste (HLW) disposal since 2008, to enhance public's understanding to the geological disposal of HLW, e.g. using underground facility. RWMC received an order of the project in fiscal year 2012 (2011/2012) continuing since fiscal year 2008 (2008/2009). Since topics in this project are included in the Horonobe URL Project, JAEA carried out this project as collaboration work continuing in fiscal year 2008. This report summarizes the results of engineering technology carried out in this collaboration work in fiscal year 2012. In fiscal year 2012, part of the equipments for emplacement of buffer material was produced and visualization test for water penetration in buffer material were carried out.
Sawada, Sumiyuki*; Nakayama, Masashi; Ishikawa, Makoto
JAEA-Data/Code 2013-018, 25 Pages, 2013/12
JAEA-Data-Code-2013-018.pdf:3.18MB
JAEA-Data-Code-2013-018-appendix(CD-ROM).zip:105.32MB
The Horonobe Underground Research Laboratory (URL) Project has being pursued by the Japan Atomic Energy Agency (JAEA) to enhance the reliability of relevant investigations of the deep geological environment within the host sedimentary formations at Horonobe, northern Hokkaido. Horonobe URL will be excavated three shafts (Ventilation shaft, East shaft and West shaft) connected by three drifts (G.L -140m, G.L -250m and G.L -350m) at the time of completion. In the construction area, the sedimentary rock has spread. And the construction position is located in the stratum boundary of Koetoi formation and the Wakkanai formation. According to the investigation from the ground, existence of the fault with springwater and of the methane separated from groundwater was confirmed. From the viewpoint of the security under construction and the control of the amount of springwater from the URL, pre-grouting was carried out. This report summarizes the construction data of the pre-grouting acquired at the Ventilation Shaft.
Nakatsuka, Noboru; Sato, Haruo; Tanai, Kenji; Sugita, Yutaka; Nakayama, Masashi; Sawada, Sumiyuki*; Niinuma, Hiroaki*; Asano, Hidekazu*; Saito, Masahiko*; Yoshino, Osamu*; et al.
JAEA-Research 2013-027, 34 Pages, 2013/11
JAEA-Research-2013-027.pdf:5.84MB
Japan Atomic Energy Agency (JAEA) and Radioactive Waste Management Funding and Research Center (RWMC) concluded the letter of cooperation agreement on the research and development of radioactive waste disposal in April, 2005, and have been carrying out the collaboration work based on the agreement. JAEA have been carrying out the Horonobe Underground Research Laboratory (URL) Project which is intended for a sedimentary rock in the Horonobe town, Hokkaido, since 2001. In the project, geoscientific research and research and development on geological disposal technology are being promoted. Meanwhile, the government (the Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry) has been promoting construction of equipments for the full-scale demonstration of engineered barrier system and operation technology for high-level radioactive waste (HLW) disposal since 2008, to enhance public's understanding to the geological disposal of HLW, e.g. using underground facility. RWMC received an order of the project in fiscal year 2010 (2010/2011) continuing since fiscal year 2008 (2008/2009). Since topics in this project are included in the Horonobe URL Project, JAEA carried out this project as collaboration work continuing in fiscal year 2008. This report summarizes the results of engineering technology carried out in this collaboration work in fiscal year 2011. In fiscal year 2011, part of the equipments for emplacement of buffer material was produced and visualization test for water penetration in buffer material were carried out.
Tokiwa, Tetsuya; Sawada, Sumiyuki; Ochiai, Shoji; Miyakawa, Kazuya
Dai-13-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (CD-ROM), p.1021 - 1025, 2013/01
In the Horonobe area of Japan, underground facilities have been excavated in soft sedimentary rocks in order to enhance the reliability of relevant technologies for geological disposal of high-level radioactive waste in Japan. Pre-excavation grouting was carried out at 250 to 380 m depth at the location of the planned Ventilation Shaft. After the grouting, the shaft was excavated from 250 to 350 m depth, and fracture mapping was carried out to understand the characteristics of water conductive fractures by focusing on the occurrence of injected grout. Fractures consist mainly of shear fractures, and extension fractures and faults are observed in the shaft. The faults are associated with fault rocks and high continuity. Grout was mainly observed in fractures located on the branching part from faults rather than the fault itself, and therefore high-permeability fractures are not the fault itself (fault core) but fractures located on the branching part in the damage zone of the fault.
Inagaki, Daisuke; Sawada, Sumiyuki; Tokiwa, Tetsuya; Tsusaka, Kimikazu; Amano, Yuki; Niinuma, Hiroaki*
JAEA-Data/Code 2012-019, 137 Pages, 2012/09
JAEA-Data-Code-2012-019.pdf:8.25MBJAEA-Data-Code-2012-019-appendix(DVD-ROM)-1.zip:1396.83MBJAEA-Data-Code-2012-019-appendix(DVD-ROM)-2.zip:876.34MBJAEA-Data-Code-2012-019-appendix(DVD-ROM)-3.zip:1053.87MBJAEA-Data-Code-2012-019-appendix(DVD-ROM)-4.zip:853.24MBJAEA-Data-Code-2012-019-appendix(DVD-ROM)-5.zip:657.5MB
In the Horonobe Underground Research Laboratory (URL) Project, construction of the ventilation shaft, the east shaft and the drifts has been conducted as a phase 2 research. In the research, observation of the lithofacies and fracture, and in-situ tests, simple elastic wave exploration, schmidt hammer test, equotip test, point load test are conducted in each face, and measuring instruments such as extensometer, rock-bolt axial force meter, shotcrete stress meter and tunnel lining concrete stress meter are installed in particular face. In addition, for the purpose of the validation of the results of predictive analysis, conducted in phase 1, about the amount of spring water during construction of underground facilities, data on the changes of amount of spring water and water quality is obtained. This report summarizes the measurements data acquired at the east shaft (GL-210 m - 250 m) and the 250 m Gallery.
Nakayama, Masashi; Sawada, Sumiyuki; Sato, Haruo; Sugita, Yutaka
JAEA-Research 2012-023, 65 Pages, 2012/08
JAEA-Research-2012-023.pdf:13.17MB
In Japan, any high-level radioactive waste repository is to be constructed at over 300m depth below surface. Tunnel support is used for safety during the construction and operation, and shotcrete and concrete lining are used as the tunnel support. Concrete is a composite material comprised of aggregate, cement and various additives. Low alkaline cement has been developed for the long term stability of the barrier systems whose performance could be negatively affected by highly alkaline conditions arising due to cement used in a repository. Japan Atomic Energy Agency (JAEA) has developed a low alkaline cement, named as HFSC (Highly fly-ash contained silicafume cement), containing over 60wt% of silica-fume (SF) and coal ash (FA). JAEA is presently constructing an underground research laboratory (URL) at Horonobe for research and development in the geosciences and repository engineering technology. HFSC was used experimentally as the shotcrete material in construction of part of the 140m deep gallery in Horonobe URL in 2010. The objective of this experiment was to assess the performance of HFSC shotcrete in terms of mechanics, workability, durability, and so on. HFSC used in this experiment is composed of 40wt% OPC (Ordinary Portland Cement), 20wt% SF, and 40wt% FA. This composition was determined based on mechanical testing of various mixes of the above components. Because of the low OPC content, the strength of HFSC tends to be lower than that of OPC in normal concrete. The total length of tunnel constructed using HFSC shotcrete is about 53m. The workability of HFSC shotcrete was confirmed by this experimental construction. In this report, we present detailed results of the 
construction test.
Nakayama, Masashi; Sawada, Sumiyuki
JAEA-Review 2012-023, 24 Pages, 2012/06
JAEA-Review-2012-023.pdf:15.83MB
As part of the research and development program on geological disposal of high-level radioactive waste (HLW), the Horonobe Underground Research Center, a division of the Japan Atomic Energy Agency (JAEA), is implementing the Horonobe Underground Research Laboratory Project (Horonobe URL Project) with the aim at investigating sedimentary rock formations. According to the research plan described in the 2nd Midterm Plan of JAEA, geological investigations are to be carried out during the drilling of a shaft down to around 350 m depth, while research and development in the areas of engineering technology and safety assessment are to be promoted by collaboration with other research organizations. The results of the R&D activities will be systematized as a "knowledge base" that supports a wide range of arguments related to the safety of geological disposal. The Horonobe URL Project is planned to extend over a period of about 20 years. The investigations will be conducted in three phases, namely "Phase 1: Surface-based investigations", "Phase 2: Construction phase" (investigations during construction of the underground facilities) and "Phase 3: Operation phase" (research in the underground facilities). This report summarizes the investigation program for the 2012 fiscal year (2012/2013). In the 2012 fiscal year, investigations in "geoscientific research", including "development of techniques for investigating the geological environment", "development of engineering techniques for use in the deep underground environment" and "studies on the long-term stability of the geological environment", are continuously carried out. Investigations in "research and development on geological disposal technology", including "improving the reliability of disposal technologies" and "enhancement of safety assessment methodologies", are also continuously carried out.
Nakayama, Masashi; Sawada, Sumiyuki; Sugita, Yutaka
JAEA-Review 2011-033, 80 Pages, 2011/09
JAEA-Review-2011-033.pdf:13.93MB
The Horonobe Underground Research Laboratory Project is planned to extend over a period 20 years. The investigations will be conducted in three phases, namely "Phase 1: Surface-based investigations", "Phase 2: Construction Phase" (investigations during construction of the underground facilities) and "Phase 3: Operation phase" (research in the underground facilities). This report summarizes the results of the investigations for the 2010 fiscal year (2010/2011). The investigations, which are composed of "Geoscientific research" and "R&D on geological disposal technology", were carried out according to "Horonobe Underground Research Laboratory Project Investigation Program for the 2010 fiscal year". The results of these investigations, along with the results which were obtained in other departments of Japan Atomic Energy Agency (JAEA), are properly offered to the implementations and the safety regulations. For the sake of this, JAEA has proceeded with the project in collaboration with experts from domestic and overseas research organisations.
Nakayama, Masashi; Sawada, Sumiyuki; Sugita, Yutaka
JAEA-Review 2011-021, 27 Pages, 2011/06
JAEA-Review-2011-021.pdf:4.16MB
As part of the research and development program on geological disposal of high-level radioactive waste (HLW), the Horonobe Underground Research Center, a division of the Japan Atomic Energy Agency (JAEA), is implementing the Horonobe Underground Research Laboratory Project (Horonobe URL Project) with the aim at investigating sedimentary rock formations. According to the research plan described in the 2nd Midterm Plan of JAEA, geological investigations are to be carried out during the drilling of a shaft down to around 350m depth, while research and development in the areas of engineering technology and safety assessment are to be promoted by collaboration with other research organizations. The results of the R&D activities will be systematized as a "knowledge base" that supports a wide range of arguments related to the safety of geological disposal. The Horonobe URL Project is planned to extend over a period of 20 years. The investigations will be conducted in three phases, namely "Phase 1: Surface-based investigations", "Phase 2: Construction phase"(investigations during construction of the underground facilities)" and "Phase 3: Operation phase (research in the underground facilities)". This report summarizes the investigation program for the 2011 fiscal year (2011/2012). In the 2011 fiscal year, investigations in "geoscientific research", including "development of techniques for investigating the geological environment", "development of engineering techniques for use in the deep underground environment" and "studies on the long-term stability of the geological environment", are continuously carried out. Investigations in "research and development on geological disposal technology", including "improving the reliability of disposal technologies" and "enhancement of safety assessment methodologies", are also continuously carried out.
Inagaki, Daisuke; Ishii, Eiichi; Niinuma, Hiroaki; Sanada, Hiroyuki; Tsusaka, Kimikazu; Sano, Michiaki*; Sawada, Sumiyuki
JAEA-Data/Code 2010-027, 151 Pages, 2011/02
JAEA-Data-Code-2010-027.pdf:9.75MB
In the Horonobe Underground Research Laboratory (URL) Project, construction of the ventilation shaft, the east shaft and the drifts has been conducted as a phase 2 research. In the research, observation of the lithofacies and fracture, and in-situ tests, simple elastic wave exploration, schmidt hammer test, equotip test, point load test are conducted in each face, and measuring instruments such as extensometer, rock-bolt axial force meter, shotcrete stress meter and tunnel lining concrete stress meter are installed in particular face. In addition, for the purpose of the validation of the results of predictive analysis, conducted in phase 1, about the amount of spring water during construction of underground facilities, data on the changes of amount of spring water and water quality is obtained. This report summarizes the measurements data acquired at the east shaft (GL-140 m - 210 m) and the 140 m drift.
Kikuchi, Hirohito; Tanai, Kenji; Sawada, Sumiyuki; Maekawa, Keisuke
no journal, ,
no abstracts in English
Shirase, Mitsuyasu*; Niunoya, Sumio*; Sawada, Sumiyuki; Nakayama, Masashi; Tanai, Kenji; Matsuzaki, Tatsuji
no journal, ,
no abstracts in English
Sawada, Sumiyuki; Nakayama, Masashi; Tanai, Kenji; Matsuzaki, Tatsuji; Motoshima, Takayuki*; Jo, Mayumi*
no journal, ,
no abstracts in English
Nakayama, Masashi; Sawada, Sumiyuki; Tanai, Kenji; Sugita, Yutaka; Matsuzaki, Tatsuji; Jo, Mayumi*
no journal, ,
no abstracts in English
Sawada, Sumiyuki; Nakayama, Masashi; Tanai, Kenji; Morikawa, Yoshito*; Jo, Mayumi*
no journal, ,
no abstracts in English
Sawada, Sumiyuki; Tokiwa, Tetsuya; Kumagai, Seiya; Minamide, Masashi*
no journal, ,
Underground facilities have been excavated in soft sedimentary rocks in the Horonobe area, Hokkaido, Japan. Spring water induced by excavation is a major issue, and therefore it is need to implement the spring water control by pre-grouting before the excavation for the efficient and safety excavation. The flow point needed to inject the grouting had been calculated by using borehole investigation data (e.g., core observations and Fluid Electric Conductivity Logging), and boring for pre-grouting was carried out. As a result, calculated flow points are identical with actual flow points. Therefore, it is quite likely to assess and predict the flow points by focusing on borehole investigation data.
Nakayama, Masashi; Sawada, Sumiyuki; Tanai, Kenji; Sugita, Yutaka
no journal, ,
The experiment for verification of performance of engineered barrier system in Horonobe Underground Research Laboratory, which located Horonobe, Japan, is planning. This presentation will be report about over view of the project.