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

Tracer tests in fractured rocks with a new fluorescent dye—pyrene-1,3,6,8-tetra sulphonic acid (PTS) / Tests de traçage en roches fracturées avec un nouveau produit fluorescent—l'acide pyrène 1.3.6.8 tétra sulfonique (PTS)

“…4) results either from a depth stratification (e.g. Zuber, 1974) or from channelling (Moreno et al, 1993;Smith et al, 2001). Within the present study too few data exist to perform a quantitative interpretation of two flow paths.…”

“…The second test was carried out at the Grimsel Test Site (GTS), which is the NAGRA (National Cooperative for the Disposal of Radioactive Waste) underground rock laboratory in the Swiss Alps (Haslital, Berner Oberland). NAGRA has been operating the GTS laboratory over the last 20 years to develop concepts of secure radioactive waste disposal (Frick et al, 1992;Smith et al, 2001).…”

Model analysis of the colloid and radionuclide retardation experiment at the Grimsel Test Site

“…1. A dipole flow field was established between two boreholes separated by a linear distance of 2.23 m. The test shear zone was characterized for the CRR experiments as well as for other experimental tracer migration experiments [18][19][20][21].…”

Contaminant transport in a fracture with spatially variable aperture in the presence of monodisperse and polydisperse colloids

“…While numerous parameter and discretization modifications could be applied to this work to more closely approximate a natural site, for example the colloid and contaminant retardation experiments of Grimsel (Smith et al 2001), the purpose of this research is to demonstrate the utility of particle tracking modeling when applied to colloid and contaminant co-transport. Although reasonable parameter values have been employed for the model simulations presented in this work, no attempt was made to match them to a particular field site.…”