Safety assessment for liquid release scenario in IAEA vault safety case

As a part of the IAEA coordinated research program on Improvement of Safety Assessment Methodologies for near surface disposal facilities (ISAM), Vault Safety Case(VSC) was developed to test and understand safety assessment approaches and to provide practical experience in their implementation. VSC is based on proposed disposals to hypothetical engineered vaults with a Vaalputs geosphere and biosphere in South Africa. Among the design scenarios which represent disposal system evolution assuming the design functions as planned, the liquid release scenario was evaluated and compared with the reported results. A newly developed system-level assessment tool, SAGE, was used for the analysis. The features and code capabilities are also addressed