ML20235U911

Notifies of Small Fish Kill in Plant Circulating Water Discharge Canal on 870703.Caused by Apparent Thermal Shock During Period of Rapidly Increasing Circulating Water Discharge Temps

ML20235U911
Person / Time
Site:	Summer
Issue date:	07/17/1987
From:	Nauman D SOUTH CAROLINA ELECTRIC & GAS CO.
To:	Kinney R SOUTH CAROLINA, STATE OF
References
NUDOCS 8707220644
Download: ML20235U911 (5)

Text

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P Bo V ca Pres Nuclear Operations

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July 17, 1987 1

Mr. Ron Kinney.

Emergency Response Section i

South Carolina Department of Health and Environmental Control

.2600 Bull Street Colu;;tia. SC 29201

Subject:

Virgil C. Summer' Nuclear Station Docket No. 50-395 Follow-Up Report Fish Kill July 3, 1987

Dear Mr. Kinney:

South Carolina Electric & Gas Company (SCE&G) herein submits the follow-up report concerning the fish kill in the Virgil C. Summer Nuclear Station (VCSNS) discharge canal on July'3, 1987. The enclosed report describes the events and the precipitating factors as determined by investigations conducted thereafter.

In accordance with the VCSNS Operating License NPF-12, Appendix B, a copy of this report is being provided to the Nuclear Reguletory Commission. Should you require any further information, please contact me at your convenience.

ruly y. rs, A.\laun n O DCB/ DAN:bjh Enclosure I

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c: J. G. Connelly, Jr.

O. S. Bradham M. B. Williams i

- j W. R. Baehr S. E. Summer W. R. Higgins )

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-W. F. Bacon 1

~0ccumentiControl Desk (NRC). g T. E;'Murley (NRC)- t' J. N. Grace (NRC) '

J. R. Rivers (DHEC, EQC) -

NPCF File 801.25 1h 1

8707220644 870717 '

PDR ADOCK 05000395 '

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~l FISH KILL INVESTIGATION REPORT July 3,1987 At approximately 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br /> on July 3,1987, Environment! Lab personnel discovered a small fish kill in the V. C. Summer Nuclear Station circulating water discharge canal. The subsequent investigation revealed 56 dead fish (Fig.1) with the following species composition:

36 white catfish (100-250 mm Total Length) 7 channel catfish (220-300 mm Total Length) 7 largemouth bass (250-350 mm Total Length) 6 bluegill (100-200 mm Total Length)

Only two of the 56 fish were found outside of the discharge canal proper, and these two fish were found in the cove immediately to the east. No distressed fish were observed and no fish were seen gulping air at the surface.

Judging from their state of decom aosition, the fish appeared to have been dead for 12 - 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. None of the deac fish showed any disease symptoms, trauma, or evidence of poisoning.

Two dissolved oxygen / water temperature profiles were taken in the discharge canal. The dissolved oxygen and temperature data are presented in Tables I and ll.

Surface pH measurements ranged from 7.1 to 7.3.

A follow-up investigation was conducted at 0930 on the following morning (7-4-87).

No dead or distressed fish were found. The water temperature in the discharge outfall was 38 C at this time and the dissolved oxygen level was 5.7 mg/L.

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Ol5CU55lON The estimated time of death of the fish corresponds with a period of ra aidly-increasing circulating water discharge temperatures (Fig. 2). The average conc enser output temperature increased from 102.9 F to 106.0 F over the 1100 - 1800, July 2, 1987, period. As dissolved oxygen and pH levels were within normal limits and the fish showed no signs of disease or trauma, we can only assume that the fish were killed by thermal shock. No NPDES limits were exceeded (or even approached) prior to or during the fish kill.

Due to the small number of fish involved and the discrete nature of the kill, we do not believe the fish community of Monticello Reservoir was significantly affected.

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- Table 1 - Dissolved oxygen and temperature profile, location #1. 7/3/87,1300 h l-Depth Temperature ( C) ygen Dissol(ed g

Surface 38.5 6.7 2m 37.7 6.5 4m 36.6 6.3 6m 35.1 6.1 8m 35.1 6.1 Table 11 - Dissolved oxygen and temperature profile, location -#2. 7/3/87,1310 h i

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Depth Temperature (*C) ygen  ;

Dissol(ed g

Surface 37.6 6.6 I

2m 37.5 6.5 1

4m 36.7 6.4 l 1

6m 36.0 6.2 8m 35.0 6.1

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