3.8. The following requirements apply for the safety case governing the development, operation and closure of a disposal facility:@@- “A safety case and supporting safety assessment shall be prepared and updated by the operator, as necessary, at each step in the development of a disposal facility, in operation and after closure. The safety case and supporting safety assessment shall be submitted to the regulatory body for approval. The safety case and supporting safety assessment shall be sufficiently detailed and comprehensive to provide the necessary technical input for informing the regulatory body and for informing the decisions necessary at each step” (Requirement 12, IAEA No.SSR-5 (2011)).@@- “The site for a disposal facility shall be characterized at a level of detail sufficient to support a general understanding of both the characteristics of the site and how the site will evolve over time. This shall include its present condition, its probable natural evolution and possible natural events, and also human plans and actions in the vicinity that may affect the safety of the facility over the period of interest. It shall also include a specific understanding of the impact on safety of features, events and processes associated with the site and the facility” (Requirement 15, Ref. [IAEA No.SSR-5 (2011)]). These regulatory requirements and conditions will have to be addressed by the operator when undertaking safety assessment and preparing the safety case. @@- “The disposal facility shall be constructed in accordance with the design as described in the approved safety case and supporting safety assessment. It shall be constructed in such a way as to preserve the safety functions of the host environment that have been shown by the safety case to be important for safety after closure” (Requirement 17, Ref. [IAEA No.SSR-5 (2011)]).@@- “The disposal facility shall be operated in accordance with the conditions of the licence and the relevant regulatory requirements so as to maintain safety during the operational period and in such a manner as to preserve the safety functions assumed in the safety case that are important to safety after closure” (Requirement 18, Ref. [IAEA No.SSR-5 (2011)]).@@- “Disposal facilities for radioactive waste shall be developed, operated and closed in a series of steps. Each of these steps shall be supported, as necessary, by iterative evaluations of the site, of the options for design, construction, operation and management, and of the performance and safety of the disposal system” (Requirement 11, Ref. [IAEA No.SSR-5 (2011)]).@@- “A disposal facility shall be closed in a way that provides for those safety functions that have been shown by the safety case to be important after closure. Plans for closure, including the transition from active management of the facility, shall be well defined and practicable, so that closure can be carried out safely at an appropriate time” (Requirement 19, Ref. [IAEA No.SSR-5 (2011)]).@@- “The safety case for a disposal facility shall describe all safety relevant aspects of the site, the design of the facility, and the managerial control measures and regulatory controls. The safety case and supporting safety assessment shall demonstrate the level of protection of people and the environment provided and shall provide assurance to the regulatory body and other interested parties that safety requirements will be met” (Requirement 13, Ref. [IAEA No.SSR-5 (2011)]).