Abstract: A sampling device for ventilation cleaning systems of nuclear power plants is designed. The device can provide samples of impregnated activated carbon iodine adsorbent with the same operation history as the iodine adsorbent in the ventilation cleaning system, so as to facilitate regular supervision and test. The relevant validation test results show that the pressure difference between the six sample cups is very close, and the flow rate is within ± 10% of the flow rate of the adsorbent. Therefore, it can be ensured that the activated carbon samples in the six sample cups have the same contact characteristics with the running gas, so they have the same representativeness; The wind speed passing through the six sampling cups is consistent with the wind speed passing through the main body of the system, thus ensuring that the adsorbent in the sampling cup has the same air contact characteristics as the adsorbent in the main body of the system; The installation of sampling device does not influence the operation of ventilation system.

Key words: sampling device, sample cup, ventilation, cleaning