ML20036A033
| ML20036A033 | |
| Person / Time | |
|---|---|
| Site: | Wood River Junction |
| Issue date: | 04/26/1993 |
| From: | Berger J OAK RIDGE ASSOCIATED UNIVERSITIES |
| To: | Parrot J NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 9305070272 | |
| Download: ML20036A033 (2) | |
Text
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f April 26,1993 Mr. Jack Parrot Division of Low Level Waste Management and Decommissioning, MS 6H3 Nuclear Materials Safety and Safeguards U.S. Nuclear Regulatory Commission Washington, DC 20555
SUBJECT:
UNC WELL SAMPLES
Dear Mr. Parrot:
This letter provides results of our additional radiological analyses, performed on five previously collected well water samples from UNC Wood River Junction, as per NRC Request for Technical Assistance (RFTA) 93-019A. Further analyses were not possible for the sample from well 519, because this sample initially contained a small volume and the sample was.thus consumed in the previous (1990/1991) analyses. Concentrations of Tc-99 in the other 5 samples are as follows:
Tc-99 e
Well ID Concentration (pCl/l) 325 113.6 i 8.9 523 119.2 i 9.4 642 124.2 i 9.0 657 68.5 i 7.0 658 122.3 i 8.5 Gamma spectrometry indicated possible low concentrations of Cs-137 in several samples:
Cs-137 Well ID Concentration (pCl/I) 325 13 i 12 523
< 17 642 22.1 i 9.4 657
< 7.6 9305070272.930426
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PDR P O. BOX 1'7 CAK ROGF,ifNNESSEE 37831-0117 Mor,oged and operoind by Ook Ridge Associamd Umwasset.es vor the O S. De;ement of Energy
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' Mr. Parrot April 23,1993 There were also small concentrations of some members of the uranium and thorium decay series identified by the gamma spectrometry; however, these identifications and the resulting concentration calculations are not considered reliable, because of the inherent discrepancies introduced when subtracting varying background levels from data accumulated over lengthy (overnight) counts of small volume samples. The presence of significant levels of radionuclides in these decay series would have been identified by high gross alpha concentrations from the early analysis, but this was not the finding of that analysis on those samples.
A request for the additional sampling of the 23 wells (RFTA 93-019B) by USGS was initiated; per my discussions with USGS, some of these wells are currently inaccessible, due to high water conditions. Sampling is anticipated by mid May, however.
If there are questions regarding this information, I may be contacted at (615) S76-3305.
Sincerely,
[#
1
/ James D. Berger, Director Environmental Survey and Site Assessment Program JDB:tte cc:
T. Mo, NRC/NMSS, 6H3 D. Tiktinsky, NRC/NMSS, 6E6 J. Swift / Brown, NRC/NMSS, 6H3 M.12ndis, ORISE/ESSAP PMDA, NRC/NMSS, 6E6 File /217 P
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