Abstract: The design and the selection of main equipment and instruments of the multi-pass test stand in evaluating filtration performance of a nuclear-grade water filter element were discribed. Some conclusions were obtained through performance tests: the maximum water flux of 4.0 m³/h for the standard filter element, and the maximum fracture strength of 0.4 MPa both meets the test requirements; particle distribution of the test system is uniform and stable, which basically meet the deviation of within ±15% between the given particle size number of each sampling interval and the average value; for the contamination impouring test, the weight contamination degree of each sample and the average value is controlled within ±5%, and the deviation between the average value and theoretical value is less than ±10%, and the deviation between the average impouring flow rate and the predetermined impouring flow rate is within ≤5%.

Key words: nuclear grade water filter, filter element, filtration performance, multi-pass method