Decontamination Performance of Foam Decontaminating Agent

The decontamination performance of three types of foam decontaminating agents prepared by mixing the foaming agents selected through a preliminary test with each of the chemical decontaminating agents was investigated. The weight loss and SEM & EDX of the FeCr2O4 oxide specimen were measured before and after decontamination. The decontamination behaviors of these foam decontaminating agents were compared with those of chemical decontaminating agents. Using the composition of the most effective foam decontaminating agent obtained from the foam decontamination experiment with the simulated oxidation test specimen, a radioactive demonstration test of foam decontamination was performed on the SG plug drawn from the nuclear power plant site. It can be concluded that the Ce (IV) concentration rather than the HNO3 concentration has a large effect on the foam decontamination behavior, and that a Ce (IV) concentration of 0.5 M or more is required. Comparing the decontamination behaviors of foam decontamination and solution decontamination using the same chemical decontaminating agent for 8 h decontamination based on the weight loss, the removal rate of the foam decontamination method (Foam-1: 2M HNO3 / 0.5M Ce (IV) in 1%(v/v) TBS + 1wt.% M-5 silica) is about 75.6% of the solution decontaminating method, showing a relatively effective decontamination performance.