Abstract: The water filter element is mainly used to remove the corrosion products and suspended solid particles in the water in the form of colloid. It is the core key spare part to ensure the water quality, reduce the radioactivity level of the medium and the environment, and improve the working environment. According to the requirements of the technical specifications and the industry standard NB/T 20486, the third-generation AP/CAP series of radioactive water treatment water filter elements for nuclear power plants are domestically developed. This article gives a detailed introduction to the structure, production process and comprehensive performance of the filter element. The test results of the developed filter element with a filtration accuracy of 5 μm and 20 μm show that the clean pressure difference of the filter element is less than 0.021 MPa, and the filtration efficiency is above 99%. The rupture pressure difference is greater than 0.52 MPa, and it can bear an axial load of at least 45 kg, has good radiation resistance, and all performance indicators meet industry standards.

Key words: Water filter element, AP/CAP series nuclear power unit, Radioactive water treatment, Comprehensive performance, Localized research and development