Phase I of the LTD project runs from 2005 until 2008. During this time,four main experiments are being carried out in situ at the GTS.
The monopole experiment | |
Aims: | To study matrix diffusion in undisturbed rock matrix and compare results of in situ, laboratory and modelling studies. |
Overview: | ![]() |
Outcomes: | Computer models for matrix diffusion will be verified via in situ testing. |
The in situ porosity experiment | |
Aims: | To study changes in porosity around a fracture system, to determine the extent of connected pore space in the matrix and to compare in situ and lab derived porosity values. See also the Pore Space Geometry (PSG) experiment. |
Overview: |
Investigate links between hydraulic testing, lab-derived diffusion co-efficients and porosity changes at increasing depths from a shear zone. |
Outcomes: | Development of field characterisation techniques, derive correction factors for lab-based porosity determinations. |
Natural Tracer Study | |
Aims: | To find evidence of long term diffusion to support the in situ derived data. |
Overview: | ![]() |
Outcomes: | Techniques and understanding will be developed and evaluated to provide high quality data for PA calculations on the extend of matrix diffusion. |
Diffusion Process Study | |
Aims: | Locate and quantify Cs-137 concentrations in the rock matrix and examine structural and mineralogical associations. |
Overview: | ![]() |
Outcomes: | Provide further evidence for matrix diffusion. |
Long Term Diffusion project (LTD) Experiment