ML19323E310
| ML19323E310 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 04/30/1980 |
| From: | GEORGIA POWER CO. |
| To: | |
| Shared Package | |
| ML19323D808 | List: |
| References | |
| NUDOCS 8005230370 | |
| Download: ML19323E310 (4) | |
Text
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APRIL 30, 1980 SUPPLEMENTAL NARRATIVE
SUMMARY
TO LER 50-323/1979-021. REV. 5 EDWIN I. HATCH NUCLEAR PLANT - UNIT 1 NONROUTINE RADIOLOGICAL ENVIRONMENTAL OPERATING ANOMALOUS MEASUREMENT REPORT This report which supplements the previous submittals on LER 50-321/1979-21 provides updated data on tritium levels in ground water sa=ples taken from locations where the average value over the first quarter of 1980 exceeded 3.0 E4 pCi/1 which is the report level for tritium in environmental water samples according to Table 3.2-3 of the ETS. There continues to be no significant impact on the public health and safety due to these readings which exceeded the report level. As reported previously any releases to unrestricted areas are through the outfalls of the drainage system; such releases are minuscule and result in insignificant doses to the public.
This report also provides an update on investigative, corrective and or.her activities related to this problem which transpired during the first quarter of 1980. Near the end of March the annual environmental surveillance report was submitted; a comprehensive analysis of this problem was provided in Section 2.4 of that report.
A report dated March 3 on two significant leaks from the condensate transfer i
pumps or related plumbing was made as a supplement to this LER.
On February 4 about 22 gallons of condensate water leaked to the ground from one of the Unit 1 pumps; the tritium level in the water from this leak was 9.64 E4 pCi/1. Subsequently, a sample taken on March 1 from the spillway beneath this pump had a tritium ~.evel of 8.26 E4 pCi/1. On February 16 about 55 gallons of condensate water from one of the Unit 2 pumps leaked to the ground; the tritium level in this water from this leak was 6.88 E5 pCi/1.
As reported previously, about 450 gallons of condensate water leaked to the i
ground due to the failure of a seal on one of the Unit 1 condensate transfer pumps on December 3, 1979. Consequently, report levels of tritium were reached for samples taken at T12 and T19 during the 4th quater of 1979.
Report levels were reached at T13 during the 1st quarter of 1980. The history of the tritium levels at T12. T13, and T19 is presented in Table 1.
In each
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of these cases, the peaks reached near the end of 1979 are attributed to the
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1eak occurring on December 3.
The leak on February 3 appeared to have also had some subsequent impact on the 1e.vels at these locations. The levels at r
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all three locations are now subsidfag.
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For several quarters the tritium levels found at N9B, P16, T4 and J18 have been reported. The levels found for sa=ples taken during the first quarter of 1980 are presented in Table 2; the history of the average quarterly levels at these locations is also presented. The increases at P16 and T18 are attributed to the leaks from the Unit 1 condensate transfer pu=ps which occurred on December 3, 1979 and February 4, 1980. The tritium level at T4 now appears to be subsiding. The tritium level at N9B see=s to have about reached its peak.
As expounded in the annual report, the results from the dye study continue to confirm the hypothesis that the high tritium levels at T4 and N9B are due to process water releases from an open-ended line near_ P17B.which.-occurred _ prior i
to March 21, 1979, when this extraneous tritium source was terminated. The high levels at locations south of CST-1 are due to leaks from the Unit 1 con-densate transfer pumps.
The extraneous source of tritium to the ground water due to leaks from the condensate transfer pumps and associated plumbing is to be eliminated by j
erecting for each unit a dyke around the pad n on which the pu=ps are mounted.
This will thereby preclude the water from any subsequent leaks from reaching the ground. The water so contained from any such leaks will be drained to radwaste. At the end of the quarter the construction of these dykes was- ~~
about 20% complete; construction is expected to be completed by the end of j
the second quarter.
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TABLE 1 HISTORY OF TRITIUM LEVELS AT CERTAIN AFFECTED SA"PLING LOCATIONS pCi/1 Date T12 T13 T19 4/19/79 a
4/20/79
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4/23/79 2.50 (3) 4/24/79 4.76 (3) dry 4126L79 1.46 (4) 4/27/79
<1.53-(3) 4/30/79 2.21 (4)
<1.48 (3)e a
5/03/79 2.42 (4)
<1.33 (3) dry 5/04/79 dry 5/07/79 2.26 (4)
<1.62 (3)d 5/10/79 3.13 (4)
.<1.60 (3)
<1.60 (3) 5/14/79 2.14 (4)
<1.70 (3) 3.57 (3) 5/17/79
<1.60 (3) 1.24 (4) 5/21/79
<1.70 (3) 1.86 (4) 5/24/79
<1.70 (3) 1.91 (4) 5/28/79
<1.70 (3) 1.88 (4) 5/31/79
<1.70 (3) 1.98 (4) 6/05/79
<1.70 (3) 1.88 (4) 6/11/79 1.06 (3) 2.09 (4) 6/13/79
<1.60 (3) 1.72 (4) 6/26/79 1.59 (3) 2.06 (4) 7/11/79 1.04 (3) 2.50 (2) 1.74 (4)*
7/26/79 1.58 (4) 8/09/79 7.80 (2) 2.40 (2) 1.52 (4) 8/24/79 1.25 (4) 9/05/79 5.30 (2) 1.80 (2) 1.13 (4) 9/18/79 1.36 (4) 10/02/79 1.78 (4)
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10/10/79 8.22 (2)
<9.50 (1) 10/19/79 2.23 (4) 11/02/79 1.95 (4) -
11/09/79 1.25 (3) 2.13 (2) 11/16/79 2.03 (4) 11/30/79 1.58 (4) 12/04/79 2.56 (5)
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, ~<3.47 (3) 1.59 (4)
.Y 12/14/79 2.76 (5)
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32/26/79 3.65 (5) 1.96 (5) lf 1/08/80 1.57 (5) 1.08 (5) 1/24/80 1.00 (5) 1.15 (5)
,.8 2/05/80 6!61 (4) 7.68 (4) 1.07 (5) l 2/19/80 9.66 (4) 8.47 (4) 3/04/80 4.65 (4) 8.48 (4) 7.81 (4) 3/13/80 6.77 (4) 6.69 (4) 7 ??,';)
i 3/20/80 9.11 (3) 1 *
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Supplement April 30, 1980 ll.
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TABLE 2 TRITIUM LEVEL AT CERTAIN OT* DER AFFECTED LOCATIONS pCi/1 Date or Quarter N9B P16 T4 T18 During ist Quarter of 1980 1/08 1.43 (5)"
1/10 1.75 (5) 8.32 (4) 1/1.*
6.91 (4) 1/24 1.52 (5) 8.56 (4) 1.20 (5) dry 2/05 1.76 (5) 1.17 (5) 1.01 (5) dry 2/19 1.83 (5) 1.02 (5) 9.71 (4) dry 3/04 1.76 (5) 1.22 (5) 1.04 (5) dry 3/13 1.79 (5) 6.55 (4) 7.68 (4) 3/20 1.69 (5) 6.70 (4) 2.61 (4) 1.05 (5)
Quarter 1v Averages 2/78 1.44 (5) 3/78 3.45 (3) 1.54 (5) 4/79 4.49 (3) 1/79 3.42 (4) 1.26 (5) 2/79 8.50 (4) 9.60 (4) 9.70 (4) 6.68 (4) 3/79 1.38 (5) 7.08 (4) 1.64 (5) 7.61 (4) 4/79 1.71 (5) 6.38 (4) 1.48 (5) 6.84 (4) 1/80 1.73 (5) 9.18 (4) 9.54 (4) 8.71 (4)
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5 a) indicates 1.43 x 10 Supplement April 30, 1980
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