Description

Desaturation of EDZ occurs due to i) ventilation and degassing during the operational phase and ii) gas generation and suction exerted by bentonite during the post-closure phase. Resaturation of EDZ occurs due to the presence of a hydraulic gradient and due to gas dissolution. The duration of the desaturation and saturation periods may have significant effects on other safety-relevant processes (canister corrosion, waste dissolution, etc.).

OPA Category

Category as used in the OPA assessment

Bentonite-HR interface

OPA Number

Number as used in the OPA assessment

2.01

Waste Relevance

Classes of waste to which this FEP is relevant

SF/HLW

NEA V1 IFEP Reference(s)

Related IFEPs from the NEA V1 IFEP list from 1999

2.1.08, 2.2.01, 2.1.12