CHANGES IN BARRIER RETENTION CAPABILITY
Over the disposal time of 1 Mio years the barriers may change their retention capability.
After the loss of canister integrity the redundancy of the multi-barrier system is thus lost after a relatively short time, but creeping and compacting in the host rock (salt, clay) can delay the transport of dangerous fission products.
Yet to strike the problem at it roots:
The retention capability of the waste package should be considered as a central problem with top priority!