Characterization of ventilation ductwork in Building K-29 at the Oak Ridge K-25 Site.

摘要

An extensive sampling and analysis program was initiated in mid-October 1992 to characterize the ductwork of Building K-29 at the Oak Ridge K-25 Site. This building, 4 acres under roof, contains approximately 1500 feet of main exhaust ducts (plenums), not including the side laterals. A large number of hexane-moistened wipe samples were taken from randomly selected locations within the four main plenums and the side lateral ducts. Three wipes were taken from each location and were analyzed for polychlorinated biphenyls (PCBs), uranium, and technetium. These samples were augmented with 12 metal coupon samples (cut from the ducts) that were analyzed for radionuclides and subjected to Toxicity Characteristic Leaching Procedure analyses for toxic metals, base/neutral/acid compounds, and volatile organic compounds. Based on the wipe analyses, with 95% confidence, 95% of the contamination levels in the ductwork are as follows. PCB levels are < 16,200 and < 2300 (mu)g/100 cm(sup 2) for the main plenums and side lateral ducts respectively; uranium levels are < 910 and < 6770 (mu)g/100 cm(sup 2) for the main plenums and side lateral ducts respectively; and technetium levels are < 16,100 and < 65,000 pCi/100 cm(sup 2) for the main plenums and side laterals respectively. The levels of radiological contamination found would classify the main and side lateral ducts as contamination areas according to Energy Systems' standards for radiation protection and its interpretation of Attachment 2 of DOE Order 5480.11.