NAGRA Opalinus Clay (…002 - Version 1
FEP 13.2.5 Colloid transport

Colloids are expected to be immobile in the backfilled and sealed tunnels and shafts due to the fine pore structure of the backfill material and the seals (filtration). Colloids may, however, be transported through any connected void spaces along the interface with the host rock and also through any connected fractures in the EDZ. The distance the colloids are transported depends on their stability and on a range of chemical and physical processes that may lead to filtration.