[en] Automatic translation: To determine the ball flow behavior in the AVR core A model test on a scale of 1: 1 was carried out at the BBK Institute. So far, the calculations were based on a flow behavior that was determined with a glass sphere model on a scale of 1: 7.5. In experiments with this model, the influence of the graphite noses remained on the ball flow are not taken into account. Test balls were only inserted in the middle between two shut-off rod noses. the Noses slow down the flow in the area of the outer core a lot strong. Probably the deviations from the previous ones Invoices from the values measured in the company for use the flow behavior determined with the glass ball model traced back. Since the 1: 1 model also has test balls inserted at different angles between the graphite noses it is more appropriate to describe the actual Flow behavior. The evaluation carried out here provides, among other things, the basis for a better 5-channel Flow model of the EREBUS program. Continue to be a relationship between occupancy ratio and inner core radius and a comparison of the 1: 7.5 glass sphere model with the 1: 1 graphite sphere model.