[en] Development of repository systems for three different waste types, arising at the Olkiluoto nuclear power plant, is in active active stage in accordance with the schedule set in the policy decision made by the Finnish Government in 1983. A repository for low- and intermediate-level operating waste (VLJ-repository) should be in operation by the end of 1992. Excavation works at Olkiluoto were started in April 1988. The plans include co-location of a repository for decommissioning wastes. A repository development programme for spent fuel is proceeding, too. At the end of 1985 technical plans including safety assessment for deep disposal in cyrstalline bedrock were presented and screening of candidate areas for site investigations was reported. The field investigations are going on at five sites and will be finalized by the end of 1992. In addition, technical plans will be updated and a comprehensive safety assessment will be performed taking into account the investigation sites. In the repository systems development safety and performance assessments have been widely used, the objects ranging from concept feasibility, repository design, and optimization of technical barriers to licencing of construction. The analyses and the ways to present their results are discussed. 9 refs., 5 figs