ML19312C454
| ML19312C454 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 01/20/1977 |
| From: | Parker W DUKE POWER CO. |
| To: | |
| References | |
| NUDOCS 7912130980 | |
| Download: ML19312C454 (3) | |
Text
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suu:e Mr. Norman C. Moseley, Director U. S. Nuclear Regulatory Commission Suite 818 230 Peachtree Street, Northwest Atlanta, Georgia 30303 Re: Oconee Nuclcse Station Docket N7s. 50-269, -270, -287
Dear Mr. Moselay:
Pursuant to the requirements of Oconee Nuclear Station Technical Specifi-cation 6.6.2.2 e and d, this report is submitted describing conditions in which measured levels of radioactivity and radiation levels exceeded the control levels by greater than ten times, and describing conditions in which measured levels of radioactivity and radiation levels exceeded the control level by greater than four times, but less than ten times.
On January 17, 1977, analytical results of aquatic vegetation samples collected on January 5, 1977 were reviewed.
Summarized below are the pertinent results of the radioactive concentrations of these samples:
Radionuclide Concentrations Sample Location Type of Sample pCi/g (drv) 000.5 1-mile radius of Aquatic Cs-134
< 8.88E-02 site in Lake Keovee Vegetation Cs-137
< 8.02E-02 (Control)
Co-58
< 7.27E-02 Mn-54
< 8.46E-02 Sb-122
< 8. 80E-02 000.4 Near Liquid Aquatic Cs-134 (3.30 0.ll)E0 Effluent Release Vegetation Cs-137 (7.30 0.17)EO Point Co-58 (2.90 0.ll)EO CD-60 (1.70 0.07)E0 Mn-54 (7.66 : 0.70)E-01 SB-122 (4.03 : 0.63)E0 005.2 Hwy. 27 Bridge Aquatic Cs-134 (1.26 0.07)EO near Newry Vegetation Cs-137 (2.37 0.09)EO Co-58 (6.75 0.06)E-01 7
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an o Mr. Norman C. Moccioy Page 2 January 20, 1977 The expected buildup of activity in organisms living in station effluents is discussed on pp. 130-133 of the Final Environmental Statement for Oconee Nuclear Station. From the information provided in FES, it is possible to calculate the concentrations one would expect to see in aquatic vegetation samples collected from the vicinity of the liquid effluent release point.
The specific information required is:
1.
The tailrace concentrations of the radionuclide found in the aquatic vegetation samples, discharged as radioactive waste. These concentra-tions are based on effluent discharges for December, 1976.
2.
The biological accumulation factors for the radionuclides fcund in the aquatic vegetation samples. The biological accumulation factors used in the calculation of expected concentrations in aquatic vegeta-tion are those found in Table V-7 of the FES.
The following table summarizes this data and provides a comparison of
(
expected and actual concentrations:
l Bioaccumulation Expected Actual Max.
I Isotope H O Conc.
Factor Vegetation Conc. Vegetation Conc.
2 pCi/ml pCi/g dry wt.
pCi/g dry vt.
Cs-134 3.96E-10 25000 1.36E+01 (3.30 0.ll)E0 Cs-137 5.38E-10 25000 1.86E+01 (7.30 0.17)E0 Co-58 6.37E-10 2500 2.21E0 (2.90 ! 0.ll)E0 Cp-60 5.74E-11 2500 1.99E-01 (1.70 ! 0.07)E0 Mn-54 1.65E-09 35000 8.02E+01 (7.66
- 0. 70) E-01 Sb-122
<3.34E-12 1500 7.00E-03 (4.03 0.63)E0 With these aquatic vegetation samples, the calculated or expected concentra-tions of radionuclides, based on effluent releases, are greater than those actually determined by laboratory analyses for all radionuclides except S3-122, Co-58 and Co-60.
On January 17, 1977 analytical results of thermoluminescent dosimeters in the field from September 21, 1976 to December 21, 1976 were received.
L Summarized below are the pertinent radiation levels:
Sample Location Total mR mR/hr.
008 Liberty, S. C.
23.3 0.011 (Control) 000.17 West Fence of 123 0.056 Restricted Area 000.18 West Fence of 597 0.273 Restricted Area
Mr. Norman C. Mocalcy Pag? 3 January 20, 1977 Sample locations 000.17 and 000.18 are located well within the exclusion area on the west fence, which isolates the restricted area from the unres-tricted area. Location 000.18 is 60 feet from a borated water storage tank (BWST) which, according to unit operation, causes varying radiation levels at location 000.18. During refueling operations associated with Oconee Unit 1, the area adjacent to the BWST was monitored, and roped off as necessary, with appropriate warning signs due to the increased level of radiation from the BWST. Location 000.17 is 100 feet from the guard station and exit from the restricted area. Trucks with radioactive ship-ments remain in the area of location 000.17 while the paperwork for the radioactive shipments is completed.
The radiation levels at locations 000.17 and 000.18 represent exposures for twenty-four hours per day continuing through the quarter. Consequently, even though the radiation levels at locations 000.17 and 000.18 exesed control levels, these radiation levels do not relate to the exposures of individuals since the area adjacent to the west restricted area is occupied for short time periods only as individuals pass the point going to and from a parking lot.
Therefore, the actual exposures of individuals are well within the radiation levels permitted in unrestricted areas by 10CFR20.105.
Thus, it is concluded that the health and safety of the employees or public has not been adversely affected by these conditions.
Very truly yours, William O. Parker, Jr.
LJB:ge
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