|SRA Key Topic||SRA Topic||SRA Topic priority|
|Safety of construction and operations (Topic 5 in the SRA)||
Developing strategies and evaluating the impact on long-term safety, design, complexity and cost of geological repositories for specific operational issues.
This contributes to planning the design approach. The discussion of assumptions and approaches in handling operations, ventilation and radiation controlled areas vs. non-radiation controlled areas. They are factors influencing the design, layout and costs.
The requirement is a better understanding of the benefits and disadvantages with regard to safety, cost, logistics and technical difficulty of different design strategies such as transport underground (e.g. drift vs. shaft), vault designs( tunnels, small vaults, large vaults etc.), package emplacement strategies (e.g. remote, semi-remote, manual, by row or column), and ventilation (continuous, local, natural). These issues are all important for helping to demonstrate ALARP through the design process.
For example, strategies to evaluate operational issues such as emergency plans, gaseous radionuclides and their impacts on workers and the environment during the operational phase. Explosive gases, air dust, ventilation and fire fighting strategies are certainly of interest to various WMOs.
Concrete support for disposal drifts in clay environment: besides the design of concrete supports there is a need to proceed to demonstration of digging large drifts and installing the supports. The long term behaviour of the concrete in such an environment, and especially its consequences on the long-term safety should be assessed (qualitatively)