Posiva Oy is in charge of executing in Olkiluoto the final disposal of the spent nuclear fuel generated by its owners, TVO at its power plant in Olkiluoto and Fortum at its power plant in Loviisa.
Excavation of the vehicle access tunnels leading to the final disposal facility, technical rooms and excavation of the central tunnel for the integrated systems test have been completed in 2018. The full-scale in-situ system test (FISST) was commenced in ONKALO at the end of June and the backfilling is already completed. The aim of the FISST is to demonstrate that safe final disposal concept can be implemented as designed by Posiva. The test is monitored for several years.
The Radiation and Nuclear Safety Authority has surveyed and approved the excavation works of the main encapsulation building. The contractor for the encapsulation building has been selected and planning preparations for the executive phase is commenced. The second phase of the HVAC works in the ventilation building is completed and installation of electrical and automation systems is in progress. Preparations of strengthening of personnel shaft are ongoing. Raise boring of the canister shaft has been started.
Suppliers of the main encapsulation building equipment have been selected, and the design phase of the main equipment has progressed according to plan. In addition, the decision to construct the encapsulation building is under preparation.
Production processes, subcontracting chain and cost estimates of Posiva have been specified. Based on these elaborations Posiva has decided to implement industrialization procedures that aim to simplify both the processes and the manufacturing of components.
At the end of March, Posiva’s owners submitted the Nuclear Waste Management Annual Report for 2017 to the MEAE. In addition, Posiva’s owners have submitted every three years planned Nuclear Waste Management program to the MEAE in September 2018.
Concept and cost optimization phase of Posiva’s final disposal project has been continued in 2018.