ML20055G395

NPDES Noncompliance Notification:On 900711,limited Fish Kill Discovered in Plant Circulating Water Discharge Bay.Caused by Thermal Shock from Increasing Discharge Temp & Fluctuating Water Levels in Reservoir

ML20055G395
Person / Time
Site:	Summer
Issue date:	07/16/1990
From:	Bradham O SOUTH CAROLINA ELECTRIC & GAS CO.
To:	Krecker W SOUTH CAROLINA, STATE OF
References
NUDOCS 9007230131
Download: ML20055G395 (6)

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South Carotme Electric & Gee Company Ome S. Drechem

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,s .s,.m July 16, 1990 Mr. William R. Krecker Environmental Quality Manager Water Quality Assessments & Enforcement Division South Carolina Department t.f Health

& Environmental Control 2600 Bull Street Columbia, South Carolina 29201

SUBJECT:

Virgil C. Summer Nuclear Station Docket No. 50-395 Discharge Bay Fish Kill -

July 11, 1990

Dear Mr. Krecker:

South Carolina Electric & Gas Company (SCE&G) herewith submits a report concerning a recent fish kill which occurred in the circulating water discharge bay of the Virgil C. Summer Naclear Station (VCSNS). The enclosed report describes the event and provides a probable cause. As noted in our previous correspondence on this matter, SCE&G is investigating the fish kill issue and plans to arrive at a viable solution by the Fall of 1990.

l In accordance with the VCSNS Operating Licene,e NPF-12 Appendix B, a copy of this report is being provfded to the Nuclecr Regulatory Commission.

Additionally, a copy of the report will be provided to the South Carolina Department Chief of Fisheries, of Wildlife & Marine Resources per the request of Mr. H. J. Logan, if you have any questions, please call Mr. Charles McKinney at 345-4723.

Very truly yours,

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0. S. Bradham l  ;

EWR/0SB:nkk i Attachment i c: 0. W. Dixon, Jr./T. C. Nichols, Jr.

M. B. Williams Central Midlands District W. M. Lide, Jr. Val hash i L. A. Blue NSRC R. R. Mahan NPCF S. E. Summer RTS (ONO900083)

(Document Control Desk.;

NRC Resident inspector File (809.06-1 & 818.05)  ;

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Fish Kill Report 7/11/90 A limited fish kill was discovered in the Virgil C. Summer Nuclear Station circulating water discharge bay on 7/11/90. The apparent cause is thermal shock from increasing discharge temperatures combined with fluctuating water levels in Monticello Reservoir caused by the operation of Fairfield Pumped Storage Facility.

There were no unusual discharges from V. C. Summer Nuclear Station (VCSNS) which c could have contributed to the kill. Table 1 shows the numbers and identification of the fish killed. Figure 1 shows the location of the fish kill. Based on the temperature data presented in Figure 2, the fish were probably killed late at night on 7/10/90 when the circulating watar discharge temperature (as measured in the plant) exceeded 108'F. The time of hottest discharge temperatures correlates with low reservoir levels. VCSNS power level was reduced from July 7 through July 9 for maintenance, however the fish kill does not appear to be related to the VCSNS outage. On the bottom of the discharge bay, where the kills probably occurred, the temperature reached 103*F. Table 2 shows the lake levels and the corresponding intake and discharge temperatures from V. C. Summer Nuclear Station. More detailed data is available and will be presented to the South Carolina Wildlife and Marine Resources Department and the South Carolina Department of Health and Environmental Control with the quarterly fish kill study data.

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5. E. Summer

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Table 1 7/11/90

1. Fish Species Size Ranoe 48 white catfish 6 13 inches 4 threadfin shad 2.5 inches 1 gizzard shad 11 inches 2 white bass 6 inches l

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t TABLE 2 Lake Level intake

• Discharge

• Lake Level intake

• Discharge

• Date Hour (Feet) Temp *F Temp *F Date Hour (Feet) Temp *F Temp *F

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7/10/90 0100 422.8 80.3 105.7 7/11/90 0100 422.5 82.4 107.6 0200 423.2 79.8 105.2 0200 422.9 81.5 106.6 0300 423.6 79.7 105.2 0300 423.4 81.1 106.4 0400 424.0 79.6 105.0 0400 423.8 80.6 105.6 0500 424.3 79.3 104.6 0500 424.2 80.2 105.5 0600 424.6 79.2 104.6 0600 424.5 80.0 105.5 0700 424.9 79.1 104.6 0700 424.8 80.0 105.3 0800 425.0 79.2 104.7 0800 424.9 80.0 105.5 0900 425.0 79.5 105.0 0900 424.9 80.0 105.4 l

1000 425.0 79.7 105.1 1000 424.9 80.1 105.5 1100 424.9 79.7 105.2 1100 424.8 80.4 106.2 1200 424.7 79.8 105.4 1200 1300 424.3 80.2 105.7 1300 1400 424.0 81.2 106.7 1400 1500 423.6 80.5 105.9 1500 1600 423.2 80.7 106.1 1600 1700 422.8 80.9 106.4 1700 1800 422.4 82.6 108.1 1800 1900 422.1 82.1 107.5 1900

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2000 422.0 81.8 107.2 2000 2100 421.9 82.2 107.7 2100 2200 421.9 82.9 108.4 2200 2300 422.0 - --

2300 0000 422.2 82.5 108.0 0000

• Circulating water temperature measured at the main condensers.

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