Description

The volume effects on EBS behaviour of new products formed as the result of a corrosion reaction on the surface of a solid. Corrosion products have a higher molar volume, even in the densest state, than the material being corroded.

Category

Category of FEP

Supercontainer EBS

Sub-category

Sub-category of FEP

Chemical processes

Ondraf Niras FEP Number

Ondraf Niras FEP Number

20

FEP Effects

Description of FEP Effects

Volume increase of corrosion products may compress the buffer and lead to mechanical stresses in the overpack that in turn may cause an even faster degradation. Alternatively, void space in the waste form may be filled with corrosion products, which may decrease the transport and release of radionuclides from the waste.

NEA TN2 IFEP Reference(s)

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

2.3.3.2 Material volume changes (waste package). 2.3.4.12 Impact of chemical processes on other processes (waste package). 3.2.4.11 Impact of chemical processes on other processes (GDF).