Description

Transport of gas through the tunnel backfill, air during the resaturation phase and repository generated hydrogen gas in longer time perspectives.

SKB Number

SKB FEP Number

BfT05

Main Category

Main category for FEP

Internal process

System Component

System component to which the FEP applies

Backfill in tunnels

Handling

Explanation of how the FEP is treated

Intact canister - Resaturation/ "thermal" period. Buffer and backfill THM model. Intact canister - Long-term after saturation and "thermal" period. (Through dissolution). Failed canister - Resaturation/ "thermal" period. Neglected, since gas volumes (from buffer) assumed to be too low to reach backfill during this period. Failed canister - Long-term after saturation and "thermal" period. Neglected, pessimistically since transport would delay radioactive releases and decrease buffer pressure. The backfill would act as a sink for gas.

References

Bibliographic references to obtain more information

SR-Site Buffer, backfill and closure process report, TR-10-47, Section(s) 2.3.4, 4.2.3; SR-Site Main report, TR-11-01, Section(s) 7.4.4