Optimisation and BAT are important regulatory (societal) tools for ensuring an attitude of doing as good as reasonably possible, i.e. important supplements to the quantitative yardsticks dose and risk. Critical BAT and optimisation considerations may become an important part of the decision basis and should consequently be presented in an understandable way to the decision makers. Examples of remaining issues in developing the concepts of BAT and optimisation for geological disposal include: 1. How best to report on optimisation and BAT considerations in a safety case/licence application? 2. How to strike an appropriate balance between weight given to BAT/optimisation versus risk and dose calculations for different time periods? This is particularly relevant for situations where the calculated risks and doses are close to the regulatory targets. 3. How to define available technique or technique that can reasonably be developed?
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