ML20059G386

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NPDES Noncompliance Notification:On 900828,29 & 30,limited Fish Kills Discovered in Circulating Water Discharge Bay. Caused by Thermal Shock from Increasing Discharge Temps Combined W/Fluctuating Water Levels in Reservoir
ML20059G386
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 09/04/1990
From: Bradham O
SOUTH CAROLINA ELECTRIC & GAS CO.
To: Krecker W
SOUTH CAROLINA, STATE OF
References
NUDOCS 9009120278
Download: ML20059G386 (8)
v • d • e


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.,eptember 4 1990 >

i Mr. William R. Krecker  !

Environmental Quality Manager i Water Quality Assessments & Enforcement l

01 vision  !

South Carolina Department of Hesith ,

& Environmental Control -

2600 Bull Street i Columbia, South Carolina- 29201

SUBJECT:

Virgil C. Summer Nuclear Station d Distharge Bay Fish Kill August ce, 29 bd 30, 1990

Dear Mr. Krecker:

South Carolina Electric & Gas Company (SCE&G) herewith submits a report concerning recent fish kills which occurred in the circulating water discharge bay of the Virgil C. Summer Nuclear Station (VCSNS.) The enclosed report describes the events and'the probable cause. As noted in our previous i i

correspondence on this matter, SCE&G is continuing to investigate the cause r of the fish kills to determine a means of preventing future occurrences. ,

l '

In accordance with the VCSNS Operating License NPF-12, Apperidix B, a copy of-l this report is being provided to the Nuclear R6gulatory Comission.

Additionally, e copy of the report will h; provided to the South Carolina Department of Wiloi n e & Marine Resovrees per the request of-Mr. H. J. Logan, Chief of fisheries. .

If you have any questions, please casl at your convenience.

Very truly yours.

l kt[ W

0. S. Bradham .

CJM/OSB:cc '

c: 0. W. Dixon, Jr./T. C. Nichols, Jr. NRC Resident Irspector  ;

M. B. Williams Central Midlands District i W. M. Lide, Jr. Dick Christie "

L. A. Blue NSRC-R. R. Mahan NPCF

, . S. . E. Sumrr.er r__ RTS ONO900095)

( (Document.1. Con. trol Desk?.

a File 809.06-1 and 818.05) .

8R"!?ss $88$N35 coor

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( 0 Fish Kill Report 08/28/90, 08/29/90, and 8/30/89 1.imited fish kills were discovered in the Virgii C. Summer Nuclear Station circulating water discharge bay on 8/28/90,8/29/90 and 8/30/90. The apparent cause is thermal shock from increasing discharge temperatures combined with fluctuating water Ievels 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 could have contributed to the kills. Table 1 shows the numbers and identification of the fish killed for each day. Figure 1 shows the location of the fish kills. Table 2, Table 3 and Table 4 show the take levels, discharge bay temperatures and corresponding intake and discharge temperatures from VCSNS. Based on the temperature data presented in Tables 2,3 and 4, the fish found on 8/28,8/29, and 8/30 were probably killed late at night on 8/27,8/28 and 8/29, respectively. Circulating water discharge temperatures for these nights reached 109.1 to 110.2*F. The times of hottest discharge temperatures correlate with low-reservoir levels. Figure 2 shows the temperatures on the bottom of the discharge, bay, measured one foot above the bottom at 8uoy #1 (shown on Figure 1), reached "7.3'F on 8/27/90,107.S*F on 8/28/90 and 107.7*F on 8/29/90. More detailed data is available and will be presented to the South Carolina Wildlife and Marine Resources

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Department and the South Carolina Department of Health and Environmental I Control with the quarterly fish kill study data.

S. J. l.o ftin - 4.34A dd Environmental Specialist " 4/_ fh/9e

/ D6te' Approval _ " ' - ^ = -

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' ' * ' = = = = u Table 1 I

8/28/90

  1. Fish $Decies Size Rance 8 white catfish 6 10 inches 1 channelcatfish 8 inches

_1 unidentified sunfish (decomposed) 10 TOTAL 8/29/90

  1. Fish SDecies Size Range 33 white catfish 71/2 - 14 inches 5 bluegillsunfish 5 6 inches, 13 channel cstfish 7 15 inches 1 gizzard shad 10 inches

_1 unidentified (decon posed) 53 TOTAL 8/30/90

  1. Fish SDecies Size Ranae 71 white catfish 3 10 inches-18 channel catfish 6 + 17 inches 17 thre'adfin shad 2 inches .

__1 gizzard shad 12 inches 107 TOTAL

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TABLE 2 8/27/90 8/28/90 Dis.

  • l Dis. :

charge charge Hour Lake Level intake' Discharge' Say Hour Lake Level intake' Discharge' Bay EST (Feet) Temp 'F Temp 'F Temp.*F EST (Feet) Temp *F Temp 'F Temp.*F 0100 423.0 82.2 107.9 102.2 0100 422.1 83.8 109.4 1r' 7 v .'O 423.4 82.1 107 7 101.2 0200 422.7 83.2 108.8 .u3.8 If s 423.7 82.1 107.7 100.0 0300 423.2 83.1 108.7 102.8 3 400 424.0 82.1 107.7 99.0 0400 423.7 83.1 108.7 101.6 0500 424.3 82.0 107.6 98 0 0500 424.2 82.8

~ 108 4 100.0 0600 424 6 81.9 107 6 97.2 0600 424.6 82.7 108.3 98 8 0700 424.8 81.9 107.5 97.0 0700 424.8 82.6 108.2 98.0 0800 424.9 8l8 107.4 96.6 0800 425.0 82.4 108.0 97.0 0900 424.9 81.8 107.4 96 2 0900 1000 424.8 81.8 107 4 96.2 1000 1100 424.3 82.1 107.7 96.4 1100 i

1200 424.0 82.4 107.9 96 6 1200 l

1300 423 6 82.4 107.9 97.4 1300 1400 l

423.2 82.2 107.8 98.0 1400 l 1500 422 8 82.6 108 2 99.0 1500 1600 422.3 82.8 108 4 100.4 1600 1700 421.8 83.3 108.9 101 6 1700 1800 421 5 83.7 109 3 103.2 1800 1900 421.2 83 8 109.3 104.2 1900 2000 420 9 83.8 109 4 105.5 2000

~

2100 420.9 84.0 109 6 106.3 2100 2200 421.0 84.0 109 5 107.3 2200 2300 421.2 84.2 109 7 107.3 2300 0000 421.6 84.3 109 9 iO6.7 0000 l

Circulating water temperatu'e measured at the main condensers.

  • Measured at one foot from the bottom at Buoy # 1.

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' TABLE 3 8 28:90 8/29/90 Dis. 8 Dis. 8 tharg; Hour Lake Level intake' charge Discharge' Bay B Hour Lake Leve' intake' Discharge

  • Bay ~

EST (Ftet) Temp *F Temp *F Temp * ' EST (Feet) Temp *F Temp *F T e m p.*F 0100 422.1 83.8 109.4 105.3 0100 421.8 83.4 109.0 105.9 0200 422.7 83.2 108.8 103.8 0200 422.3 82.6 108.2 104.8 0300 423 2 83.1 108.7 102.8 0300

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422.8 82.4 108.0 103.8 0400 423.7 83.1 108.7 101.6 0400 423.3 82.5 108.0 102.4 0500 424.2 82.8 108.4 100.0 0500 423.8 82.4 108.0 101.2 0600 424.6 82.7 108.3 98.8 0600 424.1 82.3 107.9 100.0 0700 424.8 82.6 108.2 98.0 0700 424.4 82.3 107.9 99.2 0800 425.0 82 4 108 0 97.0 0800 0900 425.0 82.3 107 9 97.0 0900 1000 425.0 82.3 107.8 97.0 1000 1100 424.7 82.3 107.9 97.4 1100

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1200 424.3 82 4 108 0 97 8 1

1300 423.9 82.4 108 0 98.2 1300 1400 423.4 82.5 108 1 98.6 1400 1500 422.9 82.6 108.2 99.4 1500 1600 422.3 82.7 108.3 100.2 1600 '

1700 421.8 82.9 108.5 101.4 1700 1800 421.3 83.2 108 8 102.8 1800 1900 421.0 83.4 109.0 104.0 1900 2000 420.8 83.4 109 0 105.1

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2000 3100 420.7 83.2 108 8 106.3 2100 3200 420.7 83.2 108.8 107.3 2200 3300 420.9 83.6 109 1 107.5 2300 0000 421.3 83.6 109.1 107.1 0000

4 Measured at one foot from the bottom at Buoy a 1.

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' TABLE 4 8/29 90 8/30/90 Dis. 8 Dis. 8 charge charge Hour Lake Level intake

  • Discharge' Say Hour Lake Level intake' Discharge
  • Bay EST (Feet) Temp 'F Temp *F Te mp.*F EST (Feet) Temp *F Temp 'F Temp.'F  !

0100 421.8 83.4 109.0 105.9 0100 422.5 84.0 109.6 106.9 0200 422.3 82.6 108 2 104.8 0200 422.9 83.8 109.4 104.9 0300 422.8 82.4 108.0 103.8 0300 423.5 83.4 108.9 103.6 0400 423.3 82.5 108.0 102.4 0400 424.0 83.0 108.5 101.4 0500 423.8 82.4 1080 101.2 0500 424.5 82.7 108 3 99.4 0600 424.1 82.3 107.9 100.0 0600 424.7 82.5 108.1 98.2 0700 424.4 82.3 107.8 99.2 0700 424.9 82.4 107.9 97.8 0800 424.6 82.2 107.8 98.4 0800 425.0 82.3 107.8 97.6 0900 424.8 82.2 107.8 97.4 0900 425.0 82.2 107.7 97.6 1000 424.8 82.2 107.8 96.8 1000 1100 424.5 82.1 107.7 96.6 1100 1200 424.1 82.1 107.7 96.4 1200 1300 423.7 82.3 107.9 96.4 1300 1400 423.2 82.3 107.8 96.8 1400 1500 422.7 82.3 107.9 97.4 1500 1600 422.1 82.6 108.2 98.0 1600 l

1700 421.7 82.9 108.5 99.4 1700 1800 421 4 83.3 108.8 101.0 1800 i 1900 421.2 83.8 109.4 103.0 1900 i

2000 421.1 84.6 110.2 104.8 2000 2100 421.1 84.7 110.2 105.7 2100 2200 421.1 84.3 109.8 106.5 2200

! 2300 421.5 84.4 110.0 107.3 2300 0000 421.9 84.6 110.2 107.7 0000 l

' Circulating water temperature measured at the main condensers.

  • Measured at one foot from the bottom at 8uoy # 1.

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Discharge Canal a l

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- Bu y #3 1

Buoy #1

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Location of Fish Kill j p k l -

CIRCULATING WATER DISCHARGE

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