Description

A mixture having particles of one component, with diameters in the nanometre to micrometre size, suspended in a continuous phase of another component; the particles suspended in such a mixture are also called colloids. This FEP includes the occurrence of pseudo-colloids within the EBS. Colloids are present in groundwaters and may also be produced during degradation of the wastes or EBS materials. Colloids may form stable dispersions in porewaters. The formation and stability of colloids depend on their composition and the prevailing chemical conditions.

Category

Category of FEP

Supercontainer EBS

Sub-category

Sub-category of FEP

Chemical processes

Ondraf Niras FEP Number

Ondraf Niras FEP Number

26

FEP Effects

Description of FEP Effects

Colloids act as sorbing surfaces for radionuclides and are potentially mobile under in situ conditions. The overall impact can be a quicker radionuclide transport through the EBS, compared to transport in a dissolved form by diffusion.

Reference(s)

References Relevant to FEP

RD&D Plan , section 3.3.9.3

NEA TN2 IFEP Reference(s)

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

2.3.4.10 Colloid formation (waste package). 2.4.1.7 Colloids. 3.2.4.9 Colloid formation (GDF).