Clean-Cut Removal System for concrete decontamination

This report addresses the Clean-Cut Removal System, CCRS, which can accurately scrape the contaminated concrete surface by the rotation of special cutters and simultaneously collect the scraped debris in a drum. The techniques up to this time for removing contaminated concrete surfaces have some problems, such as irregular depth of removal, difficulty of collecting the debris, and so on. As a solution to these problems, this new method with sophisticated cutters and capable vacuum collecting systems has been developed. The cutters used in this system can scrape the concrete surface to a few millimeters' depth accurately in one pass. The debris is a uniform powder and is collected almost 100% by a vacuum collecting system. This method has many advantages, such as radioactive waste reduction, prevention of internal exposure of workers, recontamination prevention, and easy measurement of residual radioactivity after decontamination. In this report, it is shown that this system is very useful and effective for removing contaminated concrete in the nuclear facilities. (author)