Minimization of Secondary Waste in Chemical Decontamination

Because of excessively high costs involved in the radioactive waste disposal, the waste reduction issues of primary side chemical decontamination of nuclear power plants are becoming increasingly important. Various technologies to reduce the secondary waste have been tried in commercialized decontamination methods. These two processes can be used to decontamination of PWR primary surface without rinsing and/or solution exchange with chemical decomposition after each decon step, the process is essentially single stage. The process has several advantages: the sulphate ion can be removed as a precipitation, ion exchange resin generated for removing primary waste is small, and the decon equipment never needs to be drained. The objective of this study is to review the feasibility to minimize of solid waste by the sulphate precipitation and solid-liquid separation. The feasibility to minimize of solid waste by the sulphate precipitation and solid-liquid separation in the one-stage decontamination of SP-HYBRID process was reviewed.