ML19329A265
| ML19329A265 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 02/13/1976 |
| From: | Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Gibson A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| NUDOCS 8001020838 | |
| Download: ML19329A265 (7) | |
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SUITE 018 ATL ANT A, GEO RGI A 30303 February 13, 1976 N. C. Moseley, Director, Office of Inspection and Enforcement, Region II f.T.Sutherland, Chief,FuelFacilityandMaterialsSafetyBranc J
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Office of Inspection and Enforcement, Region II EVALUATION OF RESULTS OF OCONEE ENVIRONMENTAL SURVEY PERFORMED BY SOUTH CA The South Carolina Department of Health informed Region II on February 5,1976, that gamma emitting radionuclides had been detected for the first time in a water sample taken on January 29, 1976, from a point near the Clemson raw water intake in Lake Hartwell, which is downstream of Oconee Nuclear Station.
On February 6, 1976, the State informed Region 11 that the same nuclides had been detected for the first time in a January 29, 1976, sample of processed 5
Clemson potable water. Sample results are provided as attachment (1).
On February 9, 1976, the State informed Region 11 that the above nuclides were detected using an analysis procedure which provided a minimum detection limit of 0.2 picoeuries per liter, whereas all previous analyses of samples from these locations had a detection limit of 1.1 picocuries per liter.
Since all gamma emitting radionuclides identified in the January 29 drinking water samples were present in concentrations below 1.1 picocuries per liter, the results of the January 29 sample analyses do not indicate an increasing trend. Further, these concentrations are well below South Carolina drinking water standards and should not result in a radiation dose to the public greater than thac predicted in the Oconee Final Environmental Impact Statement (FES) or the numerical guides of 10 CFR 50 Appendix 1.
The State of South Carolina collects and analyzes monthly water samples from the Keowee River at the Highway 183 bridge about 1/2 mile downstream from the Oconee Nuclear Station under contract with the NRC. Results of analyses of these samples for calendar year 1975 and January, 1976 are provided as attachment (2).
Liquid radioactive waste from the Oconee Station is discharged to the Keowee River via a tailrace canal.
The entire dilution flow in this canal, and in the Keowee River in the vicinity of the plant, is comprised
-of flow through the Keowee Hydroelectric Plant. This flow varies from a leakage flow of 40 cfs to a flow of 20,800 cfs when the hydro is operating.
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. Therefore, it may be assumed that about 95% of the periodic samples taken from the Keowee River by the State were taken under conditions of minimum dilution flow, and the average concentrations of these samples would be higher than the flow proportional annual average concentration in the River.
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N. C. Mozelty
~ The flow proportional annual average concentrations in the Keowee River cannot be determined from the State sample results because river flow at the time of _each sampling is unknown. The flow proportional annual average concentration of each isotope _ identified by the State has been calculated by Region II based on total dilution flow and total amount of each isotope reported released by the licensee during calendar year 1975. These calculated values were well within 10 CFR 20 limits but, with the exception of stritium6 all exceeded FES predictions, See attachment (3).
Cet.v n 13 4 und Region II. inspected Oconee's liquid radwaste control program in December, 1975, for compliance with Technical Specification release limits. No items of noncompliance were identified. Duke Power Company management informed Region II by telephone on February 9,1976, that radiation doses to members
- of the general public caused by radioactivity in liquid effluents released from Oconee in 1975 had been calculated using NRC models and were well below their Technical Specification objectives and -the numberical guides in 10 CFR 50 Appendix 1.
An inspection has been scheduled at Oconee for the week of February 23, 1976, during which the following areas will be inspected.
1.
Administrative controls for liquid waste effluent releases and the bases used for determining effluent and dilution flow rates.
2.
Review of liquid waste release records to determine if limits have been met.
3.
Evaluation of radiochemistry capability for environmental and waste analyses.
4.
Review of environmental data including comparison of licensee and State results.
The above evaluation and planned response were discussed with J. Cunningham, Safety and Environmental Programs Branch HQ, on February 12, 1976.
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Attachments:
(1) Lake Hartwell and Clemson
- potable water sample.results (2) Keowee River sample results 1
(3) Calculated annual average concen-trations in the Keowee River t-4
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I Attachment (1)
Results of sample of water taken from Lake Hartwell on January 29, 1976, by the South Carolina Department of Health from a point near the Clemson raw water intake:
iodine-131 0.6 picocuries per liter cesium-134 0.2 picocuries per liter cesium-137 0.4 picoeuries per liter Results of sample of water taken from Clemson potable water supply on January 29, 1976, by the South Carolina Department of Health, iodine-131 0.65 picocuries per liter cesium-134 0.32 picocuries per liter cesium-137 0.28 picocuries oe-liter i
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Attachment (2)
Keowee River Sample Results Gross S H-3 I-131 Cs-134 Cs-137 Co-58
-Co-60 Jan. 1975 12.2 13,123 NDG
.NDG NDG 9
16 t-Feb.
f.8 4,200 NDG NDG NDG NDG NDG Mar.
12.7 3,258 NDG NDG 1.5 4
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Apr.
2.8 1,340 NDG NDG NDG NDG NDG May 1.6 746 NDG NDG NDG NDG NDG June 7.3 15,137 NDG NDG 10 NDG NDG i
' July 44.1 4,433 40.7 3.5 10.6 20.1 2.2 Aug. 14 6.6 10,086 NDG NDG 4.5 4.4 2.7 Aug. 28 8.6 59,019 60 NDG 3
NDG NDG
'Sep.
15.3 85,219 29 3
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NDG
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. Gross 8 H 1-131 Cs 134 Cs-137 Co-58 Co-60 Oct. 6 3.5 22,261' NDG NDG NDG NDG NDG Oct. 23 2.5 3,062 NDG NDG NDG NDG NDG
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2.1 28,640 NDG NDG NDG NDG 4.0 Dec.
2.7 3,080 NDG NDG NDG NDG NDG.
i Jan. 15 12.7 7,627 30 3.6 8
2.2 1.4 h
Jan. 29 UNK UNK 10.3 15.2 26.4
<0.2 0.3 Notes:
(1) All results are picocuries per liter' (2) "NDG" means no detectable gamma when the detection limit was 1.1-picoeuries per liter 1
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<g Attachment.(3) 10CFR20 FES Table Calculated Apx.' B, Table'II III-12 Annual Nuclide-Column 2 MPC Prediction Concentration H-3 3 x 10 3000 2400 2
I-131 3 x 10 0.2 0.79 Cs-134 9 x 10 0.64
-1W 01I Cs-137 2 x.10 -
0.045 0.30 5
Co-58, 1 x 10 l.4 1.5 Co-60 5 x 10 0.057 0.38 i
All values in table are annual average concentrations in
, Note:
picocuries per liter.
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