The Concept of Optimisation for Geological Disposal of Radioactive Waste: A Concise Review of National and International Guidance and Relevant Observations

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The present document summarizes and reviews the concepts relevant to the optimisation of geological disposal systems as they are outlined in national and international guidance as well as in the work of NEA groups. The document also presents a set of key observations and questions regarding the basic concepts relating to optimisation, especially as relates to the long term. Overall, the study shows that when dealing with the concept of optimisation, there exists ample scope to clarify concepts, facts and possibilities and to ensure that regulatory guidance is sufficiently precise and implementable. The intention is that the present document serve as a basis for discussion within and beyond NEA groups.