Combined concept system analysis. Planning of underground buildings. Final report. Technical annex 2

Non-variable planning specifications were an annual quantity of waste for disposal comprising 700 tonnes of heavy metal and 1 million spherical spent fuel elements, plus a certain geometrical formation of the available host rock in the repository in a salt dome. The variable specifications were: the ratio of wastes from integrated disposal with reprocessing to directly disposable waste, the cooling or interim storage times of highly radioactive wastes from reprocessing and LWR fuel elements from nuclear power plants and the conditioning methods. Building on the results of thermal close field calculations, the smallest unit planned was repository fields, which were grouped together to form repository divisions, covered by 22 subsurface buildings. These were sub-divided into 6 previously selected types, distinctions being made between borehole storage alone, tunnel storage alone and four different combinations of borehole and tunnel disposal. The necessary internal volumes and areas required were compiled together with costs. Finally, a comparative assessment of the influence of the variable planning factors was made with regard to the annual space requirement and volume to be accommodated on the building concepts. (orig./HP)