Description
Oxidising water flowing into the ramp or shaft from near the surface may have an adverse effect on radionuclide retention, due to oxidation of the host rock and backfill. Flow rates are expected to be low and pyrite and organic matter in the host rock will buffer the Eh. The pH value will not significantly decrease because Opalinus Clay and the backfill material are well buffered by their calcite content.
OPA Category
Category as used in the OPA assessment
Tunnels and shafts
OPA Number
Number as used in the OPA assessment
4.02
NEA V1 IFEP Reference(s)
Related IFEPs from the NEA V1 IFEP list from 1999
1.1.02, 2.1.09, 2.2.08