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Journal Articles

Grimsel test site investigation phase IV; The Nagra-JAEA in situ study of safety relevant radionuclide retardation in fractured crystalline rock, 3; The RRP project final report

Alexander, W. R.*; Frieg, B.*; Ota, Kunio

Nagra NTB 00-07, 105 Pages, 2009/11

Nagra and JAEA worked together for nearly a decade on a Radionuclide Retardation Project (RRP) at Nagra's Grimsel Test Site in Switzerland with the main aim of enhancing the understanding of radionuclide transport/retardation in fractured rock. This report summarises the results of the final phase (1996-1998) of excavation project that is an integral part of RRP. It focuses on in situ characterisation of the shear zone structure and the behaviour of radionuclides that are relevant to repository post-closure safety, but are so strongly retarded by interaction with the shear zone rock that they are not expected to migrate through the dipole flow-field in experimentally reasonable time scales. The subsequent excavation of the experimental shear zone is detailed and the results of the laboratory analysis of the three-dimensional geological structure and of the distribution of injected radionuclides within the flow-field are presented.

Journal Articles

In situ radionuclide retardation in groundwater conducting systems; Overview of the research carried out at Nagra's Grimsel Test site, central Switzerland

Biggin, C.*; M$"o$ri, A.*; Alexander, W. R.*; Ota, Kunio; Frieg, B.*; Kickmaier, W.*; Mckinley, I. G.*

Environmental Radiochemical Analysis II, p.207 - 228, 2003/00

With increasing experience in the implementation of in-situ experiments, improved process understanding and more mature repository concepts, the experimental programmes at the Grimsel Test Site in Switzerland have gradually become more complex and more directly related to open questions defined by repository implementation organisations and regulatory bodies. To date, in situ radionuclide transport/retardation in fractured crystalline rocks have been studied, increasing in complexity from simple, non-sorbing to more chemically complex, strongly sorbing radionuclides. Currently, two ongoing in situ experiments at the GTS are investigating the in situ behaviour of radionuclides in the presence of clay colloids and the retardation of radionuclides under hyperalkaline conditions.

Journal Articles

Influence of the Mode of Matrix Porosity Determination on Matrix Diffusion Calculations; Laboratory Data Relevant to in Situ Conditions?

; Alexander, W. R.*; Frieg, B.*; Schild M*

Journal of Contaminant Hydrology, 61, p.131 - 145, 2002/00

 Times Cited Count:23 Percentile:50.32(Environmental Sciences)

None

Journal Articles

Development and testing of radionuclide transport models for fractured rock; Examples from the Nagra/JNC Radionuclide Migration Programme in the Grimsel Test Site, Switzerland

; W.R.Alexan*; W.Kickmaie*; Frieg, B.*; McKinl, I. G.*

Journal of Contaminant Hydrology, 47, p.335 - 348, 2001/00

 Times Cited Count:25 Percentile:58.06(Environmental Sciences)

None

Journal Articles

The Study of In Situ Radionuclide Retardation in the Geosphere: Examples from Nagra's Grimsel Test Site, Switzerland

; McKinl, I. G.*; Mori, A.*; Frieg, B.*; W.Kickmaie*

Proceedings of International Conference on Nuclear and Radiochemistry, 0 Pages, 2000/00

None

Journal Articles

The Assessment of radiounclide retardation in fractured crystallinerocks

; Frieg, B.*; McKinl, I. G.*

Proceedings of 21st International Symposium on the Scientific Basis for Nuclear Waste Management, 0 Pages, 1997/09

None

Journal Articles

The study of radiounclide retardation in fractured rock by means ofin situ resin impregnation

; Ch.Buhler*; P.Haag*; Frieg, B.*; W.R.Alexan*

Proceedings of 21st International Symposium on the Scientific Basis for Nuclear Waste Management, 0 Pages, 1997/09

None

Journal Articles

None

; Frieg, B.*; P.Bossart*

GEOTRAP Workshop(Proceedings), , 

None

Journal Articles

None

; Frieg, B.*; McKinl, I. G.*

Proceedings of Migration '97, , 

None

Oral presentation

Current status of development of next-generation Information Synthesis and Interpretation System (ISIS), 6; Development of expert system for quality management on hydraulic data obtained by means of borehole investigations

Osawa, Hideaki; Takeuchi, Shinji; Kunimaru, Takanori; Ota, Kunio; Frieg, B.*

no journal, , 

Hydraulic packer test (HT) has been carried out in the deep borehole investigations in the URL programs. Obtained results (transmissivity and flow model etc.) are used for the groundwater modeling/simulations etc. Therefore, quality of HT data and their analysis are crucial for ensuring reliability of the modeling/simulation results. Thus quality management system for the HT from data acquisition to data analysis has been established. The established system has been applied to the borehole investigations in the URL program and confirmed the appropriateness.

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