Commentaries: Art. 69

When closing a deep geological repository, its owner must backfill all excavations of the repository and seal the sections relevant for long-term safety and security.
The closure project must describe the following aspects in particular:
1. the backfilling and sealing of the accesses to the disposal areas;
2. the transformation of the pilot section into a state suitable for long-term safety;
3. the backfilling and sealing of the accesses to the repository;
4. the assurance of long-term safety.
When closing the repository, the owner must in particular ensure:
1. that no inadmissible release of radionuclides takes place via the backfilled accesses;
2. that the separation of water-conducting rock layers existing prior to the construction of the deep geological repository is restored over the long-term;
3. that the marking of the deep geological repository is permanent.