[en] This report details results of an analytical program used to assess the performance of an electromagnetic filter at the Isar Nuclear Power Station (KKI) in the Federal Republic of Germany. This installation is the first full-scale (6100 gpm) high-temperature filtration system operating at a nuclear power plant. Performance was characterized for the application of processing high-pressure drains at a BWR. Effects of magnetic field variations and startup/shutdown transients also were tested. Characteristics of the corrosion products were investigated, e.g., particle size, species, isotopic and chemical composition. The study shows that with proper operating conditions and careful selection of the point of application reasonable crud removal efficiencies can be achieved