ML19317D962
| ML19317D962 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 04/10/1975 |
| From: | Thies A DUKE POWER CO. |
| To: | |
| References | |
| NUDOCS 7912100638 | |
| Download: ML19317D962 (2) | |
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Letter to H. C. Moseley from Duke Power Company dated : mril 10, 1975.
DISTRIBUTION:
Y 50-269 H. D. Thornburg, E 50-270 E:1QS (5) 50-287 Office of StandaMs Development
_ d. Central F31es Division of Reactor Licensdng (13)
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^ Duxz POWER COMPANY Powra Butt.ntwo 4aa Sourn Gnunca Srazzi, CuAnt.onz, N. C. asaot ceu,OIvees.$0eNr E " * "
PRODUCTION AND TRAN$ts4SSION April 10, 1975 Mr. Norman C. Moseley, Director U. S. Nuclear Regulatory Commission Su.ite 818 23f Peachtree Street, Northwest Arianta, Georgia 30303 Re:
Oconee Nuclear Station Docket Nos. 50-269, -270, -287
Dear Mr. Moseley:
On February 6, 1975, sediment sr.mples were collected, as required by Oconee Technical Specification 4.11, and sent to an outside vendor for analysis.
The results of the analysis, received on March 25, 1975, indicated that sample location 005.2, Highway 27 bridge on Lake Hartwell, exceeded the control location by a factor greater than four times.
This report is submitted in accordance with Oconee Technical Specification 6.6.2.6.d.
In previous sediment samples, the sensitivity of the analysis method for Cobalt 60 was 0.2 pCi/gm. The sample and control locations were always in agreement since both were below the minimum detectable activity of this analysis method.
Recently, a new analysis method has been utilized which has a sensitivity of.02 pCi/gm.
The results received using this more sensitive technique are:
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Control Location 006.2 Cobalt 60 activity < 2 x 10 pCi/gm
~1 Sample Location 005.2 Cobalt 60 activity 1.89 i 0.53 x 10 pCi/gm Even though the sample location is greater than the control location, both sample and control results are less than the minimum detectable activity of the previous analytical method.
It is possible that the Cobalt 60 activity seen in these most recent samples has been present before, due to variation of the natural background, but was not detected.
Very truly yours, N
e A. C. Thies dI p
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