Argentina has two nuclear power plants (one CANDU unit and two PHWR units) along with research reactors. Spent fuel from these facilities is currently stored pending a disposal solution. The long-term strategy is for deep geological disposal of spent fuel and higher activity wastes, potentially including wastes from reprocessing. CNEA is undertaking initial work to develop a deep geological disposal concept and siting programme, with support of the IAEA, and consideration of long-term post-closure safety provides an input.

Participants built experience of developing and implementing post-closure safety assessment models for deep geological disposal in AMBER. This included sessions focused on modelling potential for (i) radionuclide release and behaviour in the near-field (including different types of release models), (ii) radionuclide migration through the geosphere (including diffusive, fractured and porous pathways), and (iii) radionuclide migration and potential exposures in the biosphere. The importance of following a systematic and transparent approach to undertaking assessments and managing associated scenario, mathematical model and data uncertainties was emphasised. Principles were illustrated through examples of total systems modelling for geological disposal in AMBER.

AMBER's capabilities for spatial awareness, visualisation, rendering results in 3D and tracking quality assurance of parameters and models were appreciated, which are enhancements that have been introduced since CNEA previously received training in 2012.