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Sugita, Kenichiro*
JNC TJ7400 2005-002, 177 Pages, 2005/03
JNC-TJ7400-2005-002.pdf:2.14MBJNC-TJ7400-2005-002(errata).pdf:0.08MB
This report describes the development of a method for the classification of geochemical data quality. The project had four tasks: (1)review of quality information; (2)development of Evidence Support Logic (ESL) models; (3)development of rules for choosing parameter values; (4)classification of existing data. These process models have been applied to data from boreholes KNA-6, DH-7, DH-12, MIU-4, DH-2, MSB-2, MSB-4, MIZ-1 and DH-15. The process models provide a visualisation of data quality judgements that may be appraised rapidly. The models can be revised readily as and when additional quality information becomes available, or to reflect the differing opinions of different experts concerning data quality.
Sugita, Kenichiro*; Dershowitz, W.*
JNC TJ8440 2005-011, 376 Pages, 2005/01
JNC-TJ8440-2005-011.pdf:16.46MB
During Heisei-16, Golder Associates provided support for JNC Tokai through discrete fracture network data analysis and simulation of the Mizunami Underground Research Laboratory (MIU), participation in Task 6 of the 
sp
Task Force on Modeling of Groundwater Flow and Transport, and development of methodologies for analysis of repository site characterization strategies and safety assessment. MIU support during H-16 involved updating the H-15 FracMan discrete fracture network (DFN) models for the MIU shaft region, and developing improved simulation procedures. Updates to the conceptual model included incorporation of "Step2" (2004) versions of the deterministic structures, and revision of background fractures to be consistent with conductive structure data from the DH-2 borehole. Golder developed improved simulation procedures for these models through the use of hybrid discrete fracture network (DFN), equivalent porous medium (EPM), and nested DFN/EPM approaches. For each of these models, procedures were documented for the entire modeling process including model implementation, MMP simulation, and shaft grouting simulation. Golder supported JNC participation in Task 6AB, 6D and 6E of the sp Task Force on Modeling of Groundwater Flow and Transport during H-16. For Task 6AB, Golder developed a new technique to evaluate the role of grout in performance assessment time-scale transport. For Task 6D, Golder submitted a report of H-15 simulations to SKB. For Task 6E, Golder carried out safety assessment time-scale simulations at the block scale, using the Laplace Transform Galerkin method. During H-16, Golder supported JNC's Total System Performance Assessment (TSPA) strategy by developing technologies for the analysis of the use site characterization data in safety assessment. This approach will aid in the understanding of the use of site characterization to progressively reduce site characterization uncertainty.
Sugita, Kenichiro*; Takase, Hiroyasu*
JNC TJ7440 2005-080, 105 Pages, 2004/03
JNC-TJ7440-2005-080.PDF:3.41MB
no abstracts in English
Sugita, Kenichiro*; Dershowitz, W. S.*
JNC TJ7400 2005-060, 73 Pages, 2004/03
JNC-TJ7400-2005-060.PDF:2.48MB
None
Mitsubishi Corporation*
JNC TJ7400 2005-049, 22 Pages, 2004/03
JNC-TJ7400-2005-049.pdf:0.56MB
This study develops an approach that can be used to interpret redox conditions in paleo-groundwaters based on the trace-element content of late-stage fracture calcites. Ranges in total concentrations of selected cations in groundwaters coexisting with calcite are first calculated using analytical data on mineral chemistry and experimentally determined partition coefficients for co-precipitation of the cations in calcite.
Metcalfe, R.*; Savage, D.*; Bath, A. H.*; Walker, C.*
JNC TJ7400 2004-013, 148 Pages, 2004/03
JNC-TJ7400-2004-013.pdf:6.11MB
This report describes calculations of the solubilities of elements that are relevant to Performance Assessment in the groundwaters of the Tono area.
Sugita, Kenichiro*; Dershowitz, W.*
JNC TJ8440 2004-010, 287 Pages, 2004/01
JNC-TJ8440-2004-010.pdf:44.13MB
During Heisei-15, Golder Associates provided support for JNC Tokai through discrete fracture network data analysis and simulation of the MIU Underground Rock Laboratory, participation in Task 6 of the Aspo Task Force on Modelling of Groundwater Flow and Transport, and development of methodologies for analysis of repository site characterization strategies and safety assessment.
Yoshizoe, Makoto*; Dershowitz, W.*
JNC TJ7430 2005-005, 249 Pages, 2003/03
JNC-TJ7430-2005-005.PDF:6.43MB
None
Arthur, R. C,*
JNC TJ7400 2003-007, 52 Pages, 2003/03
JNC-TJ7400-2003-007.pdf:2.53MB
In this research, the following three items have been considered for the purpose of construction of the geochemical model which can express the chemical reaction in groundwater correctly. Evaluation of the quality of the previous analytical data in the Tono region, Grasp of the chemical character of groundwaters, Consideration about the influence between Eh, pH and CO2(g) parameter, and which the change has.
Metcalfe, R.*
JNC TJ7400 2003-006, , 2003/03
JNC-TJ7400-2003-006.pdf:2.58MB
This report describes 36Cl studies which were undertaken during the H14 financial year. 6 groundwater samples were collected for 36Cl analysis. The results of this study suggest that 36Cl data could potentially be useful for interpreting groundwater origins and flow paths.
Sugita, Kenichiro*; Dershowitz, W.*
JNC TJ8440 2003-005, 512 Pages, 2003/01
JNC-TJ8440-2003-005.pdf:45.53MB
During Heisei-14, Golder Associates provided support for JNC Tokai through data analysis and simulation of the MIU Underground Rock Laboratory, participation in Task 6 of the Aspo Task Force on Modelling of Groundwater Flow and Transport, and analysis of repository safety assessment technologies including cell networks for evaluation of the disturbed rock zone (DRZ) and total systems performance assessment (TSPA).
Mitsubishi Corporation*
JNC TJ7420 2005-116, 85 Pages, 2002/03
JNC-TJ7420-2005-116.PDF:7.21MB
The Tsukiyoshi fault intersections in the boreholes MIU-2, MIU-3 and MIU-4 were investigated. As a result, a structural atlas graphic has been prepared for each holes. In addition, the data for MIU-4 have been interpreted to produce a further borehole graphic, which divides the Toki Granite and the Tsukiyoshi Fault into a series of discrete hydrogeological domains based on a combined consideration of the lithology, mineralogical evidence for groundwater movement and alteration characteristics, as well as the structural domain interpretation. The additional observations recorded from MIU-2 and MIU-4 have also enabled the relative history of faulting and fracture mineralisation to be refined further. Seven broad fracturing events can now be distinguished. The distribution of features considered to represent potentially flowing features has been systematically recorded from MIU-2 and MIU-4. This study now distinguishes two types of features.
Yoshizoe, Makoto*; Dershowitz, W.*
JNC TJ8440 2002-005, 221 Pages, 2002/02
JNC-TJ8440-2002-005.pdf:204.14MB
The Japanese nuclear waste management program made significant advances during Heisei-13. Golder Associates provided support for these efforts through research support to the MIU Underground Rock Laboratory and the Aspo Task Force on Modeling of Groundwater Flow and Transport. Golder Associates also assisted JNC in development of approaches for analysis and modeling of the rock of the nearfield disturbed rock zone on repository safety using the GoldSim repository safety assessment system. Major achievements during Heisei-13 included: ・ initial integrated discrete fracture network/continuum model for the MIU site ・ integration of site characterization and performance assessment approaches (Aspo Task 6) ・ GoldSim cell network model for the very near field repository rock Technical information about Golder Associates HY-13 support to JNC/Tokai is provided in the appendices to this report.
Mitsubishi Corporation*
JNC TJ7440 2005-058, 18 Pages, 2001/03
JNC-TJ7440-2005-058.pdf:7.27MB
The Tsukiyoshi fault intersections in the boreholes MIU-2, MIU-3 and MIU-4 were investigated. As a result, a structural atlas graphic has been prepared for each holes. In addition, the data for MIU-4 have been interpreted to produce a further borehole graphic, which divides the Toki Granite and the Tsukiyoshi Fault into a series of discrete hydrogeological domains based on a combined consideration of the lithology, mineralogical evidence for groundwater movement and alteration characteristics, as well as the structural domain interpretation. The additional observations recorded from MIU-2 and MIU-4 have also enabled the relative history of faulting and fracture mineralisation to be refined further. Seven broad fracturing events can now be distinguished. The distribution of features considered to represent potentially flowing features has been systematically recorded from MIU-2 and MIU-4. This study now distinguishes two types.
Mitsubishi Corporation*
JNC TJ7420 2005-115, 190 Pages, 2001/03
JNC-TJ7420-2005-115.PDF:9.85MB
The fault rock intersection associated with the Tsukiyoshi Fault intersections in boreholes MIU-3 and 99SI-08 has been investigated. Seventy-one separate fault intersections have been recorded between between 498-879 m in MIU-3. The complex layered assemblage of fault rock types within each of the fault intervals are considered to represent deformation within different strain domains, rather than faultrocks formed under different episodes of movement. The fault rocks associated with either the Tsukiyoshi Fault or inferred to be related to the Shizuki Fault appear to have the same history of movement and mineralisation. Five broad phases of fracture movement and mineralisation can be differentiated. In the granite, the fault rock intervals are closely associated with intervals of altered granitic host rock. The fault movements have produced envelopes of intense microfracture networks of the adjacent rock mass. This encouraged alteration to take place by enhancing the access by the palaeogroundwaters to the rock mass. The microfractured host rocks contain significant interconnected porosity in the microfractures, and also major secondary porosity resulting from the dissolution of calcic plagioclase. Thus the zones of altered host rock may provide a guide to the distribution more porous (and presumably more permeable) rock mass. Two major intervals of faulting and fracturing have been identified in the Tertiary sequence (assumed to be Akeyo Formation) penetrated by borehole 99SI-08. On the basis of the structural and petrological relationships it has been possible to define a sequence of diagenetic and fracturing events.
Yoshizoe, Makoto*
JNC TJ7410 2001-002, 327 Pages, 2001/03
JNC-TJ7410-2001-002.pdf:8.85MB
no abstracts in English
Yoshizoe, Makoto*; WILLIAM.S DERSHO*
JNC TJ8440 2001-001, 116 Pages, 2001/02
JNC-TJ8440-2001-001.pdf:1.68MB
None