Internal nuclear safety oversight as part of organizational defence-in-depth – Lessons learned for the Nordic nuclear industry: Final report from the NKS-R INSOLE activity

The overall goal of the NKS-R INSOLE activity was to contribute to the development of internal independent nuclear safety oversight functions (INSO) at Nordic NPPs by applying a participatory approach. This final report describes the findings from the second and last year of implementing this activity. A normative framework for the INSO function implementation was developed, which contains four dimensions (system perspective, context, management and organizing, and outcome). Each dimension contains descriptions of best practices and at-risk approaches, which were identified based on the integration of theoretical and empirical research results. To concretize the research results, three tools were developed to facilitate the implementation of INSO function in practice. The three tools include maturity model for the INSO function, model of functional involvement, and role independence reflection tool. These tools aim to address the typical challenges associated with the implementation of the INSO function.