Contaminated Concrete Surface Layer Removal
Equipment is being developed to economically remove contaminated concrete surfaces in nuclear facilities . To be effective this equipment should minimize personnel radiation exposure, minimize the volume of material removed, and perform the operation quickly with the least amount of energy. Several methods for removing concrete surfaces are evaluated for use in decontaminating such facilities. Two unique methods especially suited for decontamination are described: one, the water cannon, is a device that fires a high-velocity jet of fluid causing spallation of the concrete surface; the other, a concrete spaller, is a tool that exerts radial pressure against the sides of a pre-drilled shallow cylindrical hole causing spallation to occur. Each method includes a means for containing airborne contamination. Results of tests show that these techniques can rapidly and economically remove surfaces, and leave minimal rubble for controlled disposal.
KeywordsConcrete Surface Hydraulic Cylinder Nuclear Facility Surface Removal Airborne Contamination
Unable to display preview. Download preview PDF.
- 1.L. E. Kusler, “Survey of Decontamination and Decommissioning Techniques,” ARH-CD-984, Atlantic Richfield Hanford Company, Richland, Washington, May 1977.Google Scholar
- 2.P. R. Moore, in “Proceedings of the Conference on Decontamination and Decommissioning (D and D) of ERDA Facilities,” p. 157 ERDA, Idaho Operations, Idaho Falls, Idaho, September, 1975.Google Scholar
- 3.N. G. W. Cook and V. R. Harvey, in “Proceedings 3rd International Society of Rock Mechanics Congress,” Vol. 1, Part B, pp. 1599–1615, Denver, Colorado, 1974.Google Scholar
- 4.J. A. Ayres, Editor, “Decontamination of Nuclear Reactors and Equipment,” p. 379, The Ronald Press Co., New York, 1970.Google Scholar
- 5.J. F. Nemac and K. G. Anderson, paper presented at the 1974 Annual Meeting American Nuclear Society, Philadelphia, Pennsylvania, June 1974.Google Scholar
- 6.B. S. Ureda, (1978), personal communication.Google Scholar
- 7.“Water Jet Technology,” Hydromechanics Division, Exotech Incorporated, Gaithersburg, Maryland.Google Scholar
- 8.Exotech Incorporated, “Apparatus for Producing a Pulse of Liquid for Machining Operations,” U.S. Patent No. 3746256, U.S. Patent Office, Washington, D.C.Google Scholar
- 9.Exotech Incorporated, “Apparatus for Forming Pulsed Jets of Liquid,” U.S. Patent No. 3905552, U.S. Patent Office, Washington, D.C.Google Scholar
- 10.“Darda Rock and Concrete Splitter,” Publication Number RS-73, Emaco, Incorporated, Elmwood Park, New Jersey.Google Scholar