Abstract
This study investigates the dissolution behavior of oxide layers containing radionuclides using perfluorocarbon (PFC) emulsion as a reusable medium. Chemicals such as PFC, anionic surfactant, and H2SO4 are used for preparing the PFC emulsion, and emulsified using an ultrasonication process. The FTIR results show O–H stretching that is formed by the interaction of the carboxyl group of the anionic surfactant with the hydroxyl group of water containing H2SO4, and find that the H2SO4 can be homogeneously dispersed in the PFC–anionic surfactant–H2SO4 emulsion. The dissolution test of the simulated Cr2O3 specimen is conducted using PFC emulsion containing KMnO4. Through the weight losses of specimens and Scanning Electron Microscope-Energy Dispersive X-ray Spectrometer (SEM-EDS) analysis, it is confirmed that the Cr2O3 layer on the SUS304 specimen is easily dissolved using PFC emulsion. During the dissolution of the Cr2O3, it is observed that the dispersed H2SO4–KMnO4 became unstable and separated from PFC emulsion. Based on these results, the behavior of the PFC emulsion during the dissolution of the oxide layer is explained.
Highlights
IntroductionThe metal surfaces can be contaminated with oxide layers containing the radionuclides during the operation of nuclear facilities [1,2]
Nuclear facilities consist of various metal equipment and metal devices
The removal method for dissolution of the oxide layer using reusable chemicals called P-BED is suggested in this study
Summary
The metal surfaces can be contaminated with oxide layers containing the radionuclides during the operation of nuclear facilities [1,2]. The contaminated metals increase the amounts of radioactive wastes when they are disposed of without treatment. The contaminations on the metal surface are necessary to be removed using various decontamination methods to reduce the amount of radioactive waste generation. The radionuclides on the metal surface can be removed by dissolving them along with the oxide layer using a chemical solution [2,3]. The water-based chemical method is commonly used to dissolve the oxide layer, large amounts of radioactive liquid wastes can be generated. During, the treatment of the radioactive liquid wastes, additional costs are needed, and secondary wastes are generated
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