5.3. Safety assessment is the process of using appropriate methods to analyse systematically the risk associated with the facility, and the ability of the site and the design of the facility to meet safety requirements. A safety assessment for a geological disposal facility “has to include quantification of the overall level of performance, analysis of the associated uncertainties and comparison with the relevant design requirements and safety standards... Any significant deficiencies in scientific understanding, data or analysis that might affect the results presented also have to be identified in the safety assessment [1]” (see Appendix II on post-closure safety assessment).