Management of Uncertainty in Safety Cases and the Role of Risk - Workshop Proceedings

The development of radioactive waste repositories involves consideration of how the waste and the
engineered barrier systems will evolve, as well as the interactions between these and, often relatively
complex, natural systems. The timescales that must be considered are much longer than the timescales
that can be studied in the laboratory or during site characterisation. These and other factors can lead to
various types of uncertainty (on scenarios, models and parameters) in the assessment of long-term,
post-closure performance of waste management facilities. This report includes a synthesis of the
plenary presentations and the discussions that took place at the workshop organised under the auspices
of the NEA Integration Group for the Safety Case (IGSC) on the “Management of Uncertainty in
Safety Cases and the Role of Risk”.