Description

The displacement by gas pressure of porewater containing dissolved radionuclides, or the transport of radionuclides as volatile species with GDF-generated gases.

Category

Category of FEP

Supercontainer EBS

Sub-category

Sub-category of FEP

Hydraulic processes

Ondraf Niras FEP Number

Ondraf Niras FEP Number

46

FEP Effects

Description of FEP Effects

During gas breakthrough, water will be displaced by the gas phase. Depending on the timing of gas breakthrough, dissolved radionuclides and contaminants could be driven through the disposal system and, ultimately, out of the clay faster than by the normally expected diffusive transport of these radionuclides and contaminants.

Reference(s)

References Relevant to FEP

RD&D Plan , section 4.2.2.5

NEA TN2 IFEP Reference(s)

Related IFEPs from the NEA TN2 List of Proposed IFEP Revisions [NEA/RWM/R(2013)8]

2.5.3 Gas-mediated transport (waste package). 3.2.7.7 Gas-induced dilation (GDF). 3.3.3 Gas-mediated transport (GDF).