Grimsel 2000 – Status of International Projects at the Grimsel Test Site (GTS)

2000 ◽  
Vol 663 ◽  
Author(s):  
W. Kickmaier ◽  
W. R. Alexander ◽  
S. Vomvoris ◽  
I.G. McKinley
Keyword(s):  
Performance Assessment ◽  
Test Site ◽  
Swiss Alps ◽  
Geological Environment ◽  
Grimsel Test Site ◽  
Fundamental Understanding ◽  
International Projects ◽  
Integrated Performance ◽  
Future Work ◽  
Integrated Performance Assessment

ABSTRACTDuring 17 years of cooperation, the Grimsel underground test site in the Swiss Alps has become established as a major center for study of the deep geological environment. The present Phase V of operation involves collaboration of 15 organizations from 9 countries.The 7 major projects currently running can be divided into 3 areas:- Confirmation of fundamental understanding and testing of models of processes identified to be significant in integrated performance assessment- Demonstration and optimization of site characterization technology- Demonstration of the technology for constructing and operating a deep repository in an efficient and quality assured manner.This sub-division of projects is somewhat simplistic as, wherever possible, large, long- running experiments are designed to achieve a number of goals. The paper will provide a summary of some projects running at Grimsel, an overview of the rationale behind the experimental concepts and a perspective on possible future work.

Grimsel Test Site - Phase VI: Review of Accomplishments and Next Generation of In-Situ Experiments Under Repository Relevant Boundary Conditions

2008 ◽  
Vol 1107 ◽  
Author(s):  
Ingo Blechschmidt ◽  
Stratis Vomvoris ◽  
Joerg Rueedi ◽  
Andrew James Martin
Keyword(s):  
Near Field ◽  
Planning Horizon ◽  
Test Site ◽  
Low Ph ◽  
Swiss Alps ◽  
In Situ Experiments ◽  
Grimsel Test Site ◽  
And Migration

AbstractThe Grimsel Test Site owned and operated by Nagra is located in the Swiss Alps (www.grimsel.com). The Sixth Phase of investigations was started in 2003 with a ten-year planning horizon. With the investigations and projects of Phase VI the focus has shifted more towards projects assessing perturbation effects of repository implementation and projects evaluating and demonstrating engineering and operational aspects of the repository system. More than 17 international partners participate in the various projects, which form the basic organisational “elements” of Phase VI. Scientific and engineering interaction among the different projects is ensured via an annual meeting and several experimental team meetings throughout the year. On-going projects include: evaluation of full-scale engineered systems under simulated heat production and long-term natural saturation (NF-Pro/FEBEX), gas migration through engineered barrier systems (GMT, finished this year), emplacement of a shotcrete low-pH plug (ESDRED/Module IV), testing and evaluation of standard monitoring techniques (TEM).Numerous in-situ experiments with inactive tracers and radionuclides were successfully carried out over the past few years at the Grimsel Test Site (GTS). For the GTS Phase VI, three major projects have been initiated to simulate the long-term behaviour of contamination plumes in the repository near-field and the surrounding host rock:•The CFM (Colloid Formation and Migration) project, which focuses on colloid generation and migration from a bentonite source doped with radionuclides•The LCS (Long-Term Cement Studies) project, which aims at improving the understanding of low-pH cement interaction effects in water conducting features•The LTD (Long-Term Diffusion) project, which aims at in-situ verification of long-term diffusion concepts for radionuclidesAs Phase VI approaches its mid-term point, what are the next steps planned? The accomplishments assessed to date and the opportunities with the on-going projects as well as new projects – currently under discussion – are presented herein

Modeling the Radionuclide Migration Experiments at Grimsel. What Have We Learned?

1997 ◽  
Vol 506 ◽  
Author(s):  
W. Heer ◽  
P.A. Smith
Keyword(s):  
Performance Assessment ◽  
Test Site ◽  
Radionuclide Migration ◽  
Consistent Description ◽  
Grimsel Test Site ◽  
Tracer Migration ◽  
High Degree

ABSTRACTFor several years, tracer migration experiments at Nagra's Grimsel Test Site have been performed with an exceptionally high degree of precision. A summary of the main findings obtained by modelling these experiments is presented, addressing, in particular the influence of sorption. A consistent description of tracer behaviour is achieved, giving confidence when applying broadly similar methodologies and models in geosphere performance assessment.

U, Th, Eu and colloid mobility in a granite fracture under near-natural flow conditions

2004 ◽  
Vol 92 (9-11) ◽  
Author(s):  
Thorsten Schäfer ◽  
Horst Geckeis ◽  
Muriel Bouby ◽  
Thomas Fanghänel
Keyword(s):  
Flow Velocity ◽  
Test Site ◽  
Swiss Alps ◽  
Flow Conditions ◽  
Grimsel Test Site ◽  
Natural Flow ◽  
Core Migration ◽  
Colloid Mobility

SummaryLaboratory core migration experiments were performed in a granite fracture from the Grimsel Test Site (GTS, central Swiss Alps). The flow velocity was varied (46 m yr

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