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TIMODAZ - Thermal Impact on the Damaged Zone around a Radioactive Waste Disposal in Clay Host Rocks

Project ID: 36449


This document provides an executive summary of the TIMODAZ project status of activities during the first period (01/10/2006-30/09/2007) and is intended to be a self-sufficient document for communication. It starts with the succinct information on the project: nature and scope, consortium, structure, priorities of the project, the training and dissemination plans.
In all nuclear power generating countries, the management of spent nuclear fuel and longlived radioactive-waste is an important environmental issue today. Disposal in deep clay geological formations is one of the promising options to dispose of these wastes worldwide.
In this concept of the geological disposal system, the host clay formations is considered as a principal barrier on which rest the fulfilment of key safety functions. Hence, preventing unnecessary damage to the host formation is one of the objectives of repository design. A proper evaluation of the damaged zone (DZ) in the host formation is thus an important item for the long-term safety of underground disposal.
In any case, the excavation process of the geological repository cavities (disposal drifts, transport galleries and access shafts) and its later operation inevitably lead to the creation of a damaged zone (DZ) within the clay around the engineered part of the disposal system (Davies and Bernier, 2005). The role that the so-called excavation-damaged zone (EDZ) may play in the transport of radionuclides following closure of the repository and degradation of the waste packages has been the research subject of the Euratom FP5 project SELFRAC (SELFRAC, 2007).

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