Provision of Expert Support to STUK

Quintessa is providing expert support to the Finnish Radiation and Nuclear Safety Authority (STUK) for the review and assessment of the construction licence application for the Finnish KBS-3 repository for spent nuclear fuel which is planned to be constructed at Olkiluoto.


The support is provided in two areas: the first is the post-closure safety analysis of the disposal system, in particular the review of the analysis of radionuclide transport from the repository to the biosphere. The review includes the assessment of the methodology, models and data used, the results obtained and conclusions drawn, complementary considerations and uncertainties. The second area of support is the provision of an independent analysis of the long-term thermal-hydraulic-mechanical-chemical (THMC) evolution of the near field, in particular the buffer and backfill.  Quintessa’s QPAC and AMBER software tools will be used as part of the work.

Quintessa staff have undertaken an initial review of relevant documentation submitted as part of the construction licence application and have attended two workshops for STUK’s external experts.