(GRS-794) Development of numerical methods for release and dose calculations for highly dynamic sabotage scenarios during the transport of nuclear material

[This GRS report is available in German only.]

As part of the assessment of potential sabotage scenarios involving the transport of nuclear material, this project investigates the possible release of radioactive substances resulting from the impact of anti tank weapons using shaped charges on transport and storage containers. To this end, numerical studies are being carried out to investigate the highly dynamic processes triggered by such impacts. In particular, the focus is on the release of gases laden with radioactive particles as a free jet through a small opening in the damaged container.

In the preceding research project ‘Experimental investigations of a discontinuous free jet resulting from the impact of a shaped charge during the transport of nuclear material’ (GRS-732), essential experimental data were obtained for characterising a transient particle-laden free jet. Building on this experimental foundation, a numerical model is being developed to simulate the free jet and its relevant influencing factors using Computational Fluid Dynamics. A large number of simulations are being carried out using different initial and boundary conditions and varying relevant parameters. The simulation results are evaluated in detail to quantify the influence of the various parameters and assess their potential consequences. Furthermore, the findings are analysed with regard to their potential application in optimising the assessment of nuclear fuel transports.

Overall, this report documents how simulations on this topic can be carried out in a transparent and reproducible manner. Methods and models are presented that will allow questions regarding dispersion to be addressed more quickly and effectively in future. Furthermore, the effects of parameter variations and the impact of a containment structure located within the dispersion area are assessed.