Table 1 Compilation and assessment of natural analogues (NA) for the geological barrier
From: Natural analogues for containment-providing barriers for a HLW repository in salt
Nr. | Aspect/FEP/study | Applicability in safety case (key information) | Status Site | Status NA | Confidence Building |
|---|---|---|---|---|---|
1 | Occurrence of salt domes | Long-term stability of salt domes | ++ | + | οο |
2 | Neotectonic conditions | Occurrence of earthquakes and magmatic events | ++ | – | οο |
3 | Analysis of the salt flow | Uplift rates | ++ | + | οο |
4 | Thickness and composition of the cap rock | Subrosion rates | ++ | + | ο |
5 | Behaviour of competent salt formations | Possible water pathways | + | + | ο |
6 | Br- (and Rb)-distribution in salt formations | Interaction between formation and external solutions | ++ | ++ | ο |
7 | Chemical and isotope composition of fluid inclusions | Interaction between formation and external solutions and gases | ++ | ++ | ο |
8 | Openings from salt mining | Behaviour of salt at disposal level | ● | + | ο |
9 | Basalt intrusions | Behaviour of salt at high temperatures | – | ++ | οο |
10 | Basalt intrusions | Sealing of fissures | – | ++ | ο |
11 | Kryogenic fractures | Occurrences of fractures formed by salt contraction during cooling | - | + | ο |