Abstract: It will directly affect the accuracy of the effluents measurement that whether the sampling from the stack in nuclear facility is representative. Aerosol penetration efficiency is one of the key indicators of sampling representativeness. The method and requirements of aerosol penetration efficiency experiment in sampling system is introduced in this article. The penetration efficiency test with a particle size of D_a=10 μm was carried out for a nuclear power station under construction in China, and the result was 48.42%. The penetration efficiency increased to 53.21% after improving the sampling pipeline, greater than 50%, which meets the requirement of the relevant standard.

Key words: gaseous effluents, sampling system, sampling representativeness, aerosol penetration efficiency