ML19317D524
| ML19317D524 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 06/08/1976 |
| From: | Parker W DUKE POWER CO. |
| To: | |
| References | |
| NUDOCS 7912060780 | |
| Download: ML19317D524 (3) | |
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$7taes PocowCTiose 373-4C63 Jun2 8, 1976 Mr. Norran C. Moseley, Director U. S. Nuclear Regulatory Commission
- uite 818 230 Peachtree Street, Northwest Atlanta, Georgia 30303 Re: Oconee Nuclear Station Docket Nos. 50-269, -270, -287
Dear Mr. Moseley:
Purcuant to the requirements of Oconee Nuclear Station Technical Specifications 6.6.2.2.c and d, this report is submitted describing a condition in which a me: cured level of radioactivity exceeded the control-level by greater than tcn times and describing conditions in which measured levels of radioactivity exeseded control levels by greater than four times bug less than ten times.
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On June 1, 1976, analytical results of surface water samples collected on a monthly frequency for March and April, 1976 and composite water supply samples collected in March, 1976 were reviewed.
Given below is a summary of the partinent results of the radioactivity concentration of these samples:
Collection Concentration S*rple Location Type Sample Date Radionuclide uCi/ml 000.3 Bridge N. of Surface Water March gross beta (0.0 1 5.3)E-9,
Site on Hwy. 183 I-131 (0.0 1 6.2)E-ll Connecting Canal Co-58
. < 8. 2E-9 (Control)
Cs-134
< 8.8E-9 H-3 (3.1 1 0.7)E-7 000.7 Bridge S. of Surface Water March gross beta (1. 9 1 0.1)E-7 Site on Hwy. 183 1-131 (1.2 1 0.1)E-8 Co-58 (2.7 1 0.2)E-7 Cs-134 (3.4 1 1.0)E-8 B-3 (4.441 0.03)E-5 March i
Composite B-3 (5.6 1 0.6)E-5 7[h 7912060
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Mr. Norman C. Moseley Pcgs 2 Jun2 8, 1976 Collection Concentration Sample Location Type Sample Date Radionuclide UCi/ml 0005.2 Hwy. 27 Surface Water March gross beta (6.1 1 0.9)E-8 Bridge at Newry I-131 (5.2 1 0.2)E-9 Co-58 (3.5 i 1.3)E-8 H-3 (2.8 1 0.1)E-6 013 Hartwell Surface Water March gross beta (2.4 1 0.7)E-8 Reservoir, 5.8 miles S. of Keowee Daa 004.1 Seneca (Control) Raw Water March B-3 (1.4 0.9)E-7 Composite 006.1 Clemson Raw Water March H-3 (2.6 1 0.1)E-6 Composite 012 Anderson Raw Water March
. B-3 (1.681 0.12)E-6 Composite 004.1 Seneca (Control) Finished March s H-3 (3.7 1 1.0)E-7 Water Composite 006.1 Clemson Finished March H-3 (2.7 1 0.1)E-6 Water Composite Additional samples were collected from the following locations on April 4, 1976 cnd were analyzed for I-131:
Concentration Sample Location Type Sample pCi/ml 000.7 Bridge S. of Site on Surface Water (1.3 1 0.1)E-8 Hwy. 183 005.2 Hwy. 27 Bridge at Surface Water (0.0 i 6.8)E-ll Newry 013 Hartwell Reservoir, Surface Water (0.0 1 7.1)E-ll 5.8 miles S. of Keowee Dam Radionuclide concentrations in the water samples collected are dependent upon the radionuclide concentrations in liquid effluents released from the station.
The following table summarizes these releases for March, 1976:
s Mr. Norman C. Moseley Pege 3 June 8, 1976 Maximum Average Station Tailrace Tailrace Objective Concentration Concentration Concentration Radionuclide Curies uCi/ml pCi/ml pCi/ml Corrosion & Fission Products (gross beta) 1.34E0 2.77E-6 1.09E-8 2E-8 I-131 1.44E-1 2.98E-7 1.17E-9 2E-8 Co-58 8.71E-1 1.80E-6 7.08E-9 2E-8 CS-134 5.96E-2 1.23E-8 4.85E-10 2E-8 H-3 3.30E+2 6.83E-4 2.69E-6 SE-6 From the above data, it can be seen that the average concentrations for the month in liquid effluents are within t?e objective concentrations.
Dilution and dispersion of tritium in liquid effluents between Oconee Nuclear Station and the Clemson water intake has been calculated using the equation for instantaneous release taken from the U. S. Geological Survey Paper No. 433-B, "Dicpersion of Dissolved or Suspended Materials in Flowing Streams," by Robert E. Glover (1964), p.5.
This equation accounts for longitudinal dispersion only.
Conservatism was used in selecting parameters for substitution in the instantaneous relcase equation to determine the concentration of effluents at the Clemson water These assumptions were (1) the elevation of Lake Hartwell is 654.00 intake.
The l
fast and (2) the flow of the Keowee River is 1100 efs, the yearly average.
eniculated concentration of tritium at the Clemson wa'ter intake, using the above method, is 3.47E-6 pCi/ml.
The observed concentration at the Clemson water intake is 2.7E-6 pCi/ml.
Ths Final Environmental Statement for Oconee states that "the largest estimates of dose to individuals from liquid effluents are at Clemson and Pendleton where drinking water is withdrat' from the Keowee River. The radionuclide making the mo2t important contribution to dose at these locations is tritium (more than 50%)."
The dose estimate for any individual consuming Clemson water containing 2.70E-6 pCi/ml of tritium is 0.27 mrem / year if these tritium concentrations were main-This estimate of dose is less than 0.5% of the dose from toined over the year.
Therefore, it l
natural background and less than 0.1% of the limits of 10CFR20.
l is concluded that the observed anomalous tritium concentrations do not ad-varsely affect public health and safety.
Very truly yours, 1
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William O. Parker, Jr.
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