5.10. The safety case for the operational period of a geological disposal facility should address all aspects of operation relevant to radiation exposure, including waste emplacement, any underground construction work carried out during emplacement and backfilling, sealing and closing of the facility. If it is intended that the facility could remain open for a long period after the conclusion of waste emplacement, the safety case for the operational period should include consideration of the refurbishment and replacement of equipment that would be necessary in this period. It might also be necessary to show that waste could be retrieved safely while the facility is open.