barrière naturelle

CONT: Les barrières naturelles comprennent les caractéristiques physiques et chimiques du milieu géologique du dépôt. Les composants principaux sont la roche encaissante (pluton), les roches avoisinantes autour de pluton et le réseau des eaux souterraines. La roche encaissante est une barrière matérielle contre l'intrusion et la migration des radionucléides.
CONT: Seules des barrières passives ou naturelles doivent être utilisées pour confiner les émanations d'un lieu fermé.

CONT: The natural barriers comprise the physical and chemical characteristics of the geological environment of the repository. The major components are the host rock (the pluton), the surrounding rocks (around the pluton) and the groundwater regime. The host rock is a physical barrier to intrusion and radionuclide migration.
CONT: Only passive or natural barriers are to be used to control releases from a closed-out site.
CONT: ... there has been a growth in knowledge about groundwater migration through bedrock which has resulted in a debate about how much emphasis should be placed on natural barriers in site selection, especially considering the effectiveness of engineered barriers that are now available. Their proponents argue that these barriers, unlike naturally occurring barriers, can be designed, constructed, tested and adjusted to suit the specific characteristics of the wastes which they are to contain and that they offer the potential for a greater degree of safety.