German approach to estimate potential radiological consequences following a sabotage attack against nuclear interim storages

The German approach to estimate potential radiological consequences caused by a sabotage attack on shipping and storage casks loaded with spent fuel elements in the near vicinity of interim storage facility at German NPP sites is described. The source term of radioactive releases in to the environment is calculated on the basis of a sabotage scenario including a shaped charge attack and experimental data. The atmospheric dispersion of the released aerosol particles are calculated using a Monte Carlo particle model and parameters of the German Accident Calculation Bases on the one hand in a deterministic way for the diffusion categories A - F and on the other hand in a probabilistic way corresponding to the weather situations and their probability at the storage site as well as the orographic conditions. The radiation exposures is represented by the potential doses for inhalation and for ground-shine of an adult versus distance from the storage facility and their probabilities of occurrence