Description
Geochemical reactions due to changed redox conditions (atmospheric oxygen, redox front migration, etc.), pH plume (cement dissolution) etc. can lead to changes in porewater composition and in mineral composition (dissolution, secondary minerals) and can therefore change sorption and solubility properties for the radioelements. These effects are expected to be negligible beyond a few metres into the host rock from the tunnel walls.
OPA Category
Category as used in the OPA assessment
OPA host rock
OPA Number
Number as used in the OPA assessment
2.04
NEA V1 IFEP Reference(s)
Related IFEPs from the NEA V1 IFEP list from 1999
2.2.02, 2.2.08