Table 2 Compilation and assessment of natural analogues (NA) for geotechnical barriers
From: Natural analogues for containment-providing barriers for a HLW repository in salt
Nr. | Aspect/FEP/study | Applicability in safety case (key information) | Status NA | Confidence Building |
|---|---|---|---|---|
1 | Investigations of bulkhead drift | Reduction of the permeability of an EDZ around drift sealing | + | ο |
2 | Basalt intrusions | Long-term behaviour of basaltic gravel | ++ | οο |
3 | Chemical and mineralogical composition of natural clays | Impact of high temperatures on clay minerals | ++ | ο |
4 | Properties of natural salt clays in salt | Long-term behaviour of clays as sealing material | + | ο |
5 | Corrosion of historical concrete buildings | Long-term behaviour of cementitious materials | ++ | ο |
6 | Bentonites in saline environment | Long-term behaviour of bentonite as sealing material | + | ο |
7 | Compacted backfill material from old drifts in salt mines | Compaction of crushed salt over long time scales | ● | ο |