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JAEA Reports

Hydraulic and migration study of the shallow accessible groundwater in biosphere modeling for HLW disposal

Inagaki, Manabu; Kato, Tomoko; Yoshida, Hideji*; Oyamada, Kiyoshi*; Fukaya, Yukiko*; Suzuki, Yuji*; Oi, Takao

JAEA-Research 2007-029, 81 Pages, 2007/03

JAEA-Research-2007-029.pdf:10.88MB

The project of high-level radioactive waste disposal is in activity for the site selection of HLW disposal facility and the performance assessment should be more site-specific rather than site-generic, where the applicability of the achievement of site-generic study such as second progress report (H12) to the site specific is to be clarified. In the same way, it is necessary for biosphere assessment to incorporate the site specific condition to the model. The exposure pathway or concentration of the radio nuclides should be determined according to the site specific geological condition, for example. In this paper, following topics have been selected to start the study to reflect specific geological condition to the biosphere modeling. (1) The literature survey of international and national approaches and issues relating to the treatment of GBIs within biosphere assessments, (2) To develop methodology to estimate the release point of the deep groundwater to the shallow accessible groundwater. (3) To prepare information to estimate water balance this is, in turn, necessary to assess the dilution and/or dispersion of the radionuclides in the shallow accessible groundwater body.

JAEA Reports

Improvement of biosphere assessment methodology for performance assessment of geological disposal facility (II)

Miki, Takahito*; Yoshida, Hideji*; Ikeda, Takao*

JNC TJ8400 2002-010, 66 Pages, 2002/02

JNC-TJ8400-2002-010.pdf:1.45MB

This report contains results on study of Geosphere-Biosphere Interface (GBI), development of biosphere assessment model for gaseous and volatile radionuclides, review of biosphere assessment and research on safety indicators. Regarding study of Geosphere-Biosphere Interface (GBI), FEP database for the Geosphere-Biosphere Transitions Zone (GBTZ) were compiled. Furthermore, release scenarios were identified from the FEP database, and review of conservativeness and robustness of the conceptual and mathematical models developed previously by JNC were undertaken. Regarding development of biosphere assessment model for gaseous and volatile radionuclides, the conceptual and mathematical models were developed, and it was confirmed that the impact of the exposure pathway regarding gas release to flux-to-dose conversion factor is small. Regarding review of biosphere assessment data, the parameters which were used on JNC second progress report were reviewed and classified using the biosphere data protocol categories. Furthermore, the data for key parameter(important but poorly characterized parameters) were revised. Regarding research on safety indicator, some kinds of safety indicators, especially for the non-radioactive contaminant and for the non-human biota, are reviewed.

JAEA Reports

Improvement of biosphere assessment methodology for performance assessment of geological disposal facility (II)

Miki, Takahito*; Yoshida, Hideji*; Ikeda, Takao*

JNC TJ8400 2002-009, 338 Pages, 2002/02

JNC-TJ8400-2002-009.pdf:8.57MB

This report contains results on study of Geosphere-Biosphere Interface (GBI), development of biosphere assessment model for gaseous and volatile radionuclides, review of biosphere assessment and research on safety indicators. Regarding study of Geosphere-Biosphere Interface (GBI), FEP database for the Geosphere-Biosphere Transitions Zone (GBTZ) were compiled. Furthermore, release scenarios were identified from the FEP database, and review of conservativeness and robustness of the conceptual and mathematical models developed previously by JNC were undertaken. Regarding development of biosphere assessment model for gaseous and volatile radionuclides, the conceptual and mathematical models were developed, and it was confirmed that the impact of the exposure pathway regarding gas release to flux-to-dose conversion factor is small. Regarding review of biosphere assessment data, the parameters which were used on JNC second progress report were reviewed and classified using the biosphere data protocol categories. Furthermore, the data for key parameter(important but poorly characterized parameters) were revised. Regarding research on safety indicator, some kinds of safety indicators, especially for the non-radioactive contaminant and for the non-human biota, are reviewed.

JAEA Reports

JAEA Reports

Improvement of biosphere assessment methodology for performance assessment of geological disposal facility

Yoshida, Hideji*; Miki, Takahito*; *

JNC TJ8400 2001-001, 348 Pages, 2001/02

JNC-TJ8400-2001-001.pdf:10.54MB

This report contains discussions about development of biosphere assessment model for a solid release to a soil Geosphere-Biosphere Interface, refinement of methodology for the selection of parameter values and comparison of parameter values between H12 Report and other Japanese safety assessments. Regarding the development of biosphere assessment model for a solid release to a soil Geosphere-Biosphere Interface, it was confirmed that it can, with some relatively minor modifications, be applied directly to a liquid release to soil. Regarding the refinement of methodology for the selection of parameter values, the data methodology was simplified in which the effort is focused on selecting data for key uncertain parameter. The methodology can be simplified through the use of techniques such as the categorization of available data, the grouping of parameters, the application of stopping rules and the use of the question set and decision tree. Regarding comparison of parameter values between the JNC's second progress report and other Japanese safety assessments, it is recognized that some parameters values which were used in the JNC's second progress report were different from those which were used in other Japanese safety assessment. And it was confirmed that data source and assessment context is very important for the selection of parameter values.

JAEA Reports

None

Ikeda, Takao*; Yoshida, Hideji*

JNC TJ7400 2001-004, 170 Pages, 2001/02

JNC-TJ7400-2001-004.pdf:5.18MB

no abstracts in English

JAEA Reports

Improvement of biosphere model for performance assessment of geological disposal system (III)

Ikeda, Takao*; Yoshida, Hideji*; Miki, Takahito*

JNC TJ8400 2000-046, 264 Pages, 2000/02

JNC-TJ8400-2000-046.pdf:6.73MB

This report contains discussions about methodology for the selection of parameter values, stochastic approach for the biosphere assessment and biosphere modelling for marine discharge case are described. Regarding the methodology for the selection of parameter values, important aspects for the data selection were discussed, and data selection protocol was developed. Regarding the stochastic approach for the biosphere assessment, it is confirmed that Straightforward Monte Carlo Method and Latin Hypercube Sampling Method are the most adequate based on a literature survey. Then stochastic assessment by using biosphere model that was developed in the second progress report was carried out to check the sensitivity of parameter values. Finally, availability of several kind of assessment models for marine discharge case were discussed. It was confirmed that Multiple Compartment Model was the most applicable. Assessment using Multiple Compartment Model was carried out. The results were compared with those derived by numerical model. As a result, the difference between two models were small enough.

JAEA Reports

None

Ikeda, Takao*; Yoshida, Hideji*; Miki, Takahito*

JNC TJ8400 2000-045, 134 Pages, 2000/02

JNC-TJ8400-2000-045.pdf:4.12MB

None

JAEA Reports

None

Ikeda, Takao*; Yoshida, Hideji*

JNC TJ7400 2000-006, 159 Pages, 2000/02

JNC-TJ7400-2000-006.pdf:4.81MB

no abstracts in English

JAEA Reports

None

Ikeda, Takao*; Yoshida, Hideji*

JNC TJ8400 99-036, 227 Pages, 1999/02

JNC-TJ8400-99-036.pdf:8.93MB

None

JAEA Reports

Improvement of biosphere model for performance assessment of geological disposal system (II)

Ikeda, Takao*; Yoshida, Hideji*

JNC TJ8400 99-035, 557 Pages, 1999/02

JNC-TJ8400-99-035.pdf:14.57MB

In the safety assessment of the high level radioactive waste (HLW) disposal system, it is inevitable to evaluate the radiological effects to human in the biosphere. This is because the biosphere is a field through which repository-derived radionuclides would migrate by several processes and those radionuclides would finally have an effect to human. The Japan Nuclear Cycle Development Institute (JNC) has so far developed the robust and comprehensive model / analytical code and surveyed the relevant data applicable to the assessment of several kinds of biosphere condition based on the survey and review of the "Reference Biosphere Methodology" developed and enhanced in the International Programme on Biosphere Model validation Study (BIOMOVS) and the International Programme on on Biosphere Modelling and Assessment Methods (BIOMASS). In the study of the last year, the biosphere model developed so far has been revised and refined, and using this new model the migration and accumulation of radionuclides and those effects to human has been evaluated, in order to reflect the results to the H12 assessment for HLW disposal in Japan. Thus this study, a specific reference biosphere has been developed using an approach, which is consistent with the above mentioned reference biosphere methodology. For FY97 consideration was given to groundwater release to a deep well. For FY98 consideration is being given to groundwater releases to river and inter-tidal geosphere-biosphere interfaces. The key sequential stages of the approach are listed below. (1)Development of the assessment context. (river and inter-tidal zone) (2)Description of the biosphere system. (3)Identification and initial screening of Features, Events and Processes (FEPs). (4)Identification of FEP relationships and development of conceptual model. (5)Specification of mathematical model and associated parameters values. (6)Implementation of analyses.

JAEA Reports

None

Ikeda, Takao*; Yoshida, Hideji*

JNC TJ7440 99-011, 108 Pages, 1999/02

JNC-TJ7440-99-011.pdf:6.97MB

no abstracts in English

JAEA Reports

None

Ikeda, Takao*; Yoshida, Hideji*

PNC TJ1281 98-002, 123 Pages, 1998/02

PNC-TJ1281-98-002.pdf:5.58MB

None

JAEA Reports

None

Ikeda, Takao*; Yoshida, Hideji*

PNC TJ1281 98-001, 376 Pages, 1998/02

PNC-TJ1281-98-001.pdf:14.57MB

None

JAEA Reports

None

Ikeda, Takao*; Yoshida, Hideji*

PNC TJ7281 97-001, 104 Pages, 1997/03

PNC-TJ7281-97-001.pdf:7.01MB

None

JAEA Reports

None

Ikeda, Takao*; Yoshida, Hideji*

PNC TJ1281 97-001, 98 Pages, 1997/03

PNC-TJ1281-97-001.pdf:3.5MB

None

16 (Records 1-16 displayed on this page)
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