The Scientific Basis activities of the Integration Group for the Safety Case (IGSC) examine important scientific and technical issues for the development and integration of safety cases. It intends to promote understanding of the disposal system behaviour, including an assessment of uncertainty. Examples include the performance of engineered barriers, geoscientific evidence as a basis for the safety case, and the sources and transport of gases in disposal system. Activities in this field are designed to address the question: "What do we know?"
In addition to IGSC's subgroups (Salt club, Clay club and Crystalline club), the following issues were examined as part of IGSC or related activities in the past:
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The Crystalline Club (CRC) is composed of technical experts with experience in evaluating or reviewing the understanding of crystalline rock as host rocks for deep geologic disposal projects. CRC members represent waste management agencies, regulatory authorities, academic institutions, and research and development institutions.
The Clay Club promotes the exchange of information, shared approaches and methods to develop and document an understanding of clay media as a host rock for a repository.