ML20076E102

NPDES Noncompliance Notification:On 830326 & 28,temp Rise Between Upstream Ambient Monitor & Downstream River Monitor Exceeded 5.4 F Limit.Caused by Low Riverflows.Cooling Tower & Increased Riverflows Used to Eliminate Delta Temp Changes

ML20076E102
Person / Time
Site:	Sequoyah
Issue date:	05/23/1983
From:	Elashry M TENNESSEE VALLEY AUTHORITY
To:	Marlar J ENVIRONMENTAL PROTECTION AGENCY
References
NUDOCS 8305260307
Download: ML20076E102 (8)

Text

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,. l TCNNESSEc VALLEY AUTHORITY

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,; TVA Mailroom f///-3E9 1 1, ' ,- MAY 2 31983

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'MSJohnMarla/

r, Chief FscilitiesP$rformance1 Branch Water Managemert Division JJ.S. Eny'ironmental Protection Agency g Region'IV --

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ftlanta.'G2orgia 30365  % *

Dear Mr. Marlar:

J0TIFICAT10N 0F NONCOMPLI ANCi WfTH EFFLUENT LIMITATICO - NPDES PERMIT

'NO. TN0026450 - SEQUQYAH NUCLEAP, PLANT (SQN) s '

Description of the dischargc--D(5 charge No. 024 - Diffuser gate. On Fiarch 26 and 28A he instream river temperature monitors indicated a

~ temperature rise, between, tM Upstream ambient monitor and the downstream

river monitor in' excess of tre'thimum permit limitation of b.4*F.

Theto'noncompli$nce's ccuti$honMarch26wereat5p.m.andmidnight.

,The maxim 0m delta temperature for that day was 5.47*F and occurred at

, , midnight. The noncompliance on March 28 had a maximum delta temperature of 5.49*F and occurred at I a.m. '

Cause and period of the n'oncompliance--The noncompliance on March 26

' occurred during a period of low riverflow (4,000 cfs). The plc.nt was operating t:1e cooling tower in helper /open mode operation (one tower, four lif t pumps). As a res' ult of the noncompliance, riverflows were increased to approximately 17,000 cfs in an effort to alleviate the

condi ti p. This approach proved effective for several hours and the delta temperature was reduced to 2.0l*C by 9 p.m. However, the delta temperature began to increase once more, and in order to avoid another l noncompliance, the second cooling tower was placed in-service at 10 p.m.

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, However, degjte this measure a second noncompliance occurred. Because of the substantial traveltime from the cooling tower discharge to the

- downstream rive'r monitors, the effectiveness of the second cooling tower

,b was . delayed.,'Fol, lowing the second noncompliance the riverflow at SQN I was increased to-approximately 20,000 cfs. The plant was in compliance L x by 1 ajm. on March 27. The duration of each of these noncompliances was JC .

ora hour cr less.

fhe noncompliance on March 28 was preceded by a period of low riverflows (6,000 ;fs). At 8 a.m. the diffuser pond temperature began to increase s and reached a maximum of 22.21*C at 1 p.m. Recognizing the possibility for a delta temperature noncompliance, the plant added lift pumps at s 2 p.m. and 11 p.m. Therefore one hour prior to the noncompliance, the cooling system was being operated in helper mode (two towcrs, seven lift pumps). Again, despite diligent efforts, the time delay in the cooling system made this noncompliance unavoidable. The duration of the noncompliance M was less than one hour.

8305260307 830523, PDR ADOCK 0500032/ PDR 1983-TVA SOTH ANNIVERS ARY [

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Mr. JohMarlar

,.- , MAY 2 31983

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~. 'The enclosed graphs associated with the computer compliance model illustrated the above data.

Steps taken to reduce, eliminate, and prevent recurrence of the noncomplying discharge--Coo'ing tower (s) and increased rivertlow were utilized in an effort to prevent, reduce, and eliminate these delta temperature noncompliances.

Sincerely, original Signed By M. Paul Schmierbach Mohamed T. El-Ashry, Ph.D.

Director of Environmental Quali ty Enclosures cc (Enclosures):

Mr. Harold R. Denton, Director i Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Conmission 7920 Norfolk Avenue Washington, D.C. 20555 Mr. Jack R. McConnick, Basin Manager Chattanooga Basin Office Division of Water Management 2501 Milne Street Chattanooga, Tennessee 37406 Mr. James P. O'Reilly, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region II l 101 Marietta Street Atlanta, Georgia 30303 l Tennessee Department cf Public Health l

Division of Water Management TERRA Building 150 Ninth Avenue, North Nashville, Tennessee 37203 i

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