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POST OFFICE BOX 2008 OAK RIDGE, TEM S SEE 37831-8275 OAK RIDGE NATIONAL LABORATORY MANAGED BY MARTIN MARlETTA ENERGY SYSTEMS, INC. Dr. Ronald 0. Hultgren, Deputy Assistant Manager ORNC (X-16) ' Energy Research and Development DOE Oak Ridge Field Office Post Office Box 2008 Oak Ridge, Tennessee 37831-6229 Notification of Planned Radiotracer Studies - Oak Ridge National Laboratory Walker Branch and Building 1504 Laboratory Streams This letter notifies the Department of Energy that research personnel at Oak Ridge National Laboratory plan to release small amounts of radiotracers into Walker Branch and Building 1504 laboratory streams during a series of experimental releases. The purpose of this study is to determine the effect of hydrologic backwater zones on biological uptake and cycling of phosphorus in the stream. The purpose of the Building 1504 laboratory stream study is to examine the effect of different levels of algal biomass on cycling of phosphorus in streams. While these releases are not wastewater discharges, and the amount of radiotracers involved is very small, notification of the releases to the Tennessee Department of Environment and Conservation (TDEC) is considered appropriate. In the past, notification was made to TDEC, Knoxville Basin Office, which is understood to no longer be the primary regulatory office for DOE facilities in Oak Ridge. The radiotracers in each Walker Branch study will include approximately 5 mCi of tritium as water (H-3) and 1.5 mCi of phosphorus-33 as phosphate (P-33) and will be released over 1.5 hours. The half life for H-3 is approximately 12.26 years and P-33 has a half-life of 25 days. The Building 1504 laboratory stream study will involve approximately 0.8 mCi of P-33 released in 0.1 mCi increments. Releases to two of the eight streams will be performed simultaneously over 30-minute intervals, but only two streams will be used each day. Releases are planned for a pair of streams each day for four days. The attached table summarizes the pertinent information for these studies. All personnel involved in these studies will be trained in the safe use of radionuclides, will wear appropriate protective clothing, and will be monitored by a health physicist during the experiment. Please forward this information to TDEC at the following address. Mr. Paul Davis, Director Division of Water Pollution Control Tennessee Department of Environment and Conservation Human Subjects Project
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Dr. Ronald 0. Hultgren 2 January 22,1993 If there are any questions or additional information is required, please contact C.K. Valentine at 5748775 or C. E. NU at 574-7363. Jerry H. Swanks, Director and Health Compliance
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