2.4. As national programmes for radioactive waste disposal have developed, considerable effort has been put into developing systematic and internationally recognized approaches for demonstrating the safety of disposal facilities and for preparing safety cases for specific facilities. The safety case is defined as “the collection of arguments and evidence to demonstrate the safety of a facility” [2]. The demonstration of an acceptable level of safety of a disposal facility depends on the arguments in the safety case about the characteristics of the site and the facility engineering (e.g. the system of engineered barriers), the results of safety assessment and the management arrangements for ensuring quality in all aspects of safety related work.