Description

Concerns the formation of open channels or gaps in the crushed rock backfill in the central area by inflowing groundwater and the erosion of fine particles along the so created pipes.

SKB Number

SKB FEP Number

CA06

Main Category

Main category for FEP

Internal process

System Component

System component to which the FEP applies

Central area

Handling

Explanation of how the FEP is treated

Intact canister, Resaturation/ "thermal" period: Piping in the crushed rock cannot be excluded. However, the central area is always assumed to be a part of the repository with high hydraulic conductivity. Intact canister, Long-term after saturation and "thermal" period: Piping in the crushed rock cannot be excluded. However, the central area is always assumed to be a part of the repository with high hydraulic conductivity.

References

Bibliographic references to obtain more information

SR-Site Buffer, backfill and closure process report, TR-10-47, Section(s) 2.5.3, 6.2.4