ML20151U342
| ML20151U342 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 08/09/1988 |
| From: | Bradham O SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Mcdowell E SOUTH CAROLINA, STATE OF |
| References | |
| NUDOCS 8808190044 | |
| Download: ML20151U342 (7) | |
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August 9, 1988 Mr. Edwin B. McDowell Environmental Quality Manager South Carolina Department of Health and Environmental Control Environmental Quality Control, Central Midlands District P. O. Box 156 State Park, SC 29147
Subject:
Virgil C. Summer Nuclear Station Docket No. 50-395 Follow-Up Report Fish Kill July 30-August 1, 1988
Dear Mr. McDowell:
South Carolina Electric & Gas Company (SCE&G) herein submits the follow-up report concerning the limited fish kill in the Virgil C. Summer Nuclear Station (VCSNS) discharge canal between the dates of July 30 and August 1, 1988.
The enclosed report describes the events and the precipitating factors as determined by investigations conducted thereafter.
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In accordance with the VCSNS Operating License NPF-12, Appendix B, a copy of this report is being provided to the Nuclear Regulatory Commission.
Should you require any further information, please contact me at your convenience.
Very truly yours, O. S. Bradham CJM/OSB: led pc:
M. B. Williams W. R. Baehr S. E. Sumer W. R. Higgins W. F. Bacon.
<DocumentControl:(NRC)~
~J.'N. Grace (NRC)
R. L. Prevatte J. R. Rivers (OHEC, EQC)
W. R. Krecker (DHEC)
NPCF RTS(ONO 880046)
File (818.05) ol
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I 8808190044 880809 DR ADOCK 05000395 lg PDC
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Fish KillInvestigation Report August 2,1988 Introduction Environmental Lab personnel discovered approximately 25 dead fish in the V. C.
Summer Nuclear Station Circulating Water discharge canal area on August 1,1988.
This was not considered a significant fish kill; however, environmental personnel continued monitoring the discharge area. On the morning of August 2,1988, additional dead fish were seen in the discharge canal area. The subsequent investigation revealed 129 dead fish with the following species composition:
94 White catfish (100 - 250 mm total length) 21 Channel catfish (most 150 - 300 mm total length) 5 Bluegill (50 150 mm total length) 3 Gizzard shed (25 - 75 mm totallength) 5 Lepomis types, probably Bluegill All fish were found floating in the discharge bay and canal; none were seen in open water outside of the discharge canal. The locations of the dead fish are shown on Figure 1. No distressed or moribund fish were observed. Numerous checks of the area over the next 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> turned up less than ten dead fish, all of which appeared to be Ictalurid catfishes.
I The dead fish varied greatly in condition, ranging from bloated, badly decomposed fish to relatively "fresh" fish which looked only a day or so dead. We estimate that the fish had been dead for 24 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. None of the fish examined showed any evidence of trauma, disease, or poisoning.
l Dissolved oxygen and water temperature profiles were taken in the discharge bay on 7/29/88,8/1/88, and 8/2/88. These dissolved oxygen and temperature data are presented in Tables 1,2 and 3. Circulating Water discharge temperatures are also presented in Figure 2. Surface pH measurements ranged from 6.9 to 7.1 over this four day period.
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Discussion Summer Station tripped and went off line at approximately 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> on 7/26/88.
This resulted almost immediately in lower circulating water discharge temperatures.
As has been the case in the past, fish apparently took advantage of these cooler discharge canal temperatures to recolonize the discharge area. The plantwent back on line early in the morning of 7/28/77 and reached full power at approximately 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br /> on 7/29/88. Circulating water discharge temperatures increased from 83.1*F to 107 6'F over this period. We believe the affected fish were either trapped
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in deep-water refuge areas or lingered too long in the discharge and were killed by thermal shock. It appears that the trapped fish began to die on 7/30/88, and were completely killed off by 8/1/88.
The NPDES instantaneous discharge limit of 113' F was never exceeded over this period--the highest reading was 109.7-and there were no unusual spills or releases from the plant over the 7/26/88 - 8/2/88 period. Meteorological conditions probably did not contribute to the kills.
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1 MONTICELLO RESERVOIR
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j SERVICE WATER POND 2 FISH J.\\
4 107 Fish Temp,/D.C. Poemi!
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CIRCULATING WATER DISCHARGE 7-2-it Jozo-i t s o Figure 1
Circulating Water Discharge Tempsrature
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NPDES DISCHARGE LIMIT 113* F
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110 -
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105 -
100 -
O 95 -
90 -
85 -
80 -
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7-25 7-26 7-27 7-28 7-29 7-30 7-31 8-1 8-2 8-3 8-4 Time Figure 2
l' Table 1 - Dissolved Oxygen and Temperature Profile,7/29/88 Diss lved xygen Depth Temperature ( F)
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Surface 101.4 5.6 1m 100.9 2m 100.8 5.6 3m 100.6 4m 99.9 5.4 Sm 99.3 6m 98.8 7m 98.6 8m 97.3 5.3 9m 97.1 10m 97.1 11m 96.8 5.2 Table 2. Dissolved Oxygen and Temperature Profile,8/1/88 Depth Temperature (*F)
Dissolved Oxygen (mg/L)
Surface 102.9 5.75 1m 102.5 2m 101.9 5.75 3m 101.7 4m 101.5 5m 101.1 6m 100.2 7m 100.0 8m 100.0 5.65 9m 99.8 10m 97.1 11m 95.9 5.5
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Table 3 - Dissolved Oxygen and Temperature Profile 8/2/88
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Dissolved xygen Depth Temperature (*F)
Surface 101.2 5.2 q
1m 101.3 5.1
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2m 100.2 5.1 3m 99.5 5.1 4m 98.6 5.1 l
Sm 98.3 6m 97.5 7m 97.5 Sm 97.0 5.0 9m 96.1 10m 94.6 11m 94.3 5.0
.