ML19322B584
| ML19322B584 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 12/23/1975 |
| From: | Parker W DUKE POWER CO. |
| To: | Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 7912040613 | |
| Download: ML19322B584 (2) | |
Text
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l Dtyxn POWER CMIPM Powen Dun.on<o 42a Sourn Cnuncu Sturer. CnAnt.orre. N. C. maa4a WIL LIAM O. PA p n t ti, J R ViC E PDttaDENT St r aen PRODuCteow ItLEDMOkt: Anta 704 37 >4053 December 23, 1975 1
Mr. Norman C. Moseley, Director U. S. Nuclear Regulatory Commission Seite 818 230 Peachtree Street, Northwest Atlanta, Georgia 30303 7
Oconee Nuclear Statio/
i Re:
n Docket Nos. 50-269[-270,-287
Dear Mr. Moseley:
In recpense to requirements of Oconee Technical Specific ti letter of December 11 n.y on 6.6.2.6.d, a
concentration in a compos,ite water sample collected over th1975 de faly 1 to September 30, 1975, e quarter, control location by greater than ten times. exceeded the tritium concentr ti l
a on at the
'nformation is submitted to provide an evaluation of this cThe following supplem i
{
ondition:
Tritium concentrations in water samples collected at L dependent upon the tritium concentrations of liquid effl ocation 000.7 are the station.
For the quarter, July 1 to September uents released from l,
tritium were released from the station in liquid 30, 1975, 986 Curies of tailrace concentration of tritium was 4.94 x 10 6 effluents; the average tailrace concentration of tritium was 3 x 10 3
- pCi/ml, and the maximum The station's objective in making effluent released ispCi mpc concentration.
to maintain tritium tailrace concentrations at 5 l
x 10 6 pCi/ml.
c The Technical Specification liquid effluents is 1 x 10 5
'"E 9"** ** Y " " *"*#"*'
l' pCi/ml.
the average tritium concentrations for the quarteFrom this data, it can be seen that i
Specification limiting concentration.within the objective concentrat i
t erly Technical monthly grab samples collected during the quarterThe wate ositn of three representative only of the tritium concentrations present at th This sample is the grab samples were collected.
e three times The average tailrace concentration i
A
/ '/
v t
39120,40 h [
"V Mr. Norman C. Mossley December 23, 1975 Page 2 of tritium, expresged in the same units as the sample collected from 000.7 is 4.94 x 10 pCi/1; the maximum tailrace cencentration, glso expressed in the same units as the sample collected from 000.7, is 3 x 10 pCi/1. The tritium concentration of 7.30 + 0.44E + 04 pCi/1 indicates that a portion of the composite sample was collected when an effluent release was made, at or near the maximum tailrace concentration.
A continuous composite sampler, collecting small increments of sample at set time intervals, is and has been located at sample Location 000.7.
Tritium analyses performed on sampics collected monthly from this sampler are listed telow:
July 15,600 pCi/1 August 39,000 pCi/1 September 63,800 pCi/1 Even these results are not representative of the average tritium concentrations present at Location 000.7 because the sampler does not composite samples proportional to the flow of water passing the sampler at Location 000.7 The flow of water passing the sampler at Location 000.7 may vary from the leskage flow of 40 cfs to 20,800 cfs when the hydro is operating; the annual average flow is 1100 cfs. The hydro plant operates approximately 40 hours4.62963e-4 days <br />0.0111 hours <br />6.613757e-5 weeks <br />1.522e-5 months <br /> per month or about 5% of the time.
95% of the sample collected with the composite sampler is under canditions of minimum flow and will more nearly approximate the concentraticas of tritium in the tailrace without hydro operat on.
Ver truly yours, n.
&. a X William O. Parker, Jr.
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