W3P85-1036, NPDES Noncompliance Notification:On 850411,flow at Outfall 002 Exceeded Max Flow of 0.232 Mgd.Cause Unknown.On 850421, Thermal Discharge Exceeded Permit Limitation.Caused by Compensation Calculation Using full-flow Four Pump Rate

NPDES Noncompliance Notification:On 850411,flow at Outfall 002 Exceeded Max Flow of 0.232 Mgd.Cause Unknown.On 850421, Thermal Discharge Exceeded Permit Limitation.Caused by Compensation Calculation Using full-flow Four Pump Rate

ML20128M522
Person / Time
Site:	Waterford
Issue date:	05/15/1985
From:	Barkhurst R LOUISIANA POWER & LIGHT CO.
To:	Knudson M ENVIRONMENTAL PROTECTION AGENCY
References
W3P85-1036, NUDOCS 8505310682
Download: ML20128M522 (2)

Text

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POWER & LIGHT / New CALeANS LoUSANA 70174-6008 9 (504) 389 a345 M100LE SOUTH UTIUTIES SYSTEM May 15, 1985 W3P85-1036 3-A25.01.02 A4.10 Mr. Myron O. Knudson, P.E.

Director, Water Management Division

• Environmental Protection Agency Region VI First International Building 1201 Elm Street Dallas, Texas 75270

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SUBJECT:

Waterford Steam Electric Station Unit Number 3 NPDES Permit No. LA 0007374

Dear Mr. Knudson:

On April 11, 1985, the flow at outfall 002 was 0.366 MGD which exceeded our permitted maximum flow of 0.232 MGD. We became aware of this noncompliance on May 13, 1985 while preparing the Discharge Monitoring Reports (DMRs) for April 1985. The exact cause of this unusually high flow is unknown, although there was overall a greater flow through this outfall this month than has been occurring. Flows for several days surrcunding this day were at least an order of magnitude lower than this flow, and this one time-occurrence was the only exceedence during the menth.

On April 21, 1985, the thermal disch'arge was calculated to be 1.0 x 1010 BTU /hr which exceeded our permit limitation of 8.5 x 109 BTU /hr. We became aware of this apparent noncompliance also while preparing the April DMRs on May 13, 1985.

This parameter is calculated by multiplying the instantaneous temper..ure rise across the condenser by the flow occurring at that point in time. This cal-culated value appears to have exceeded our permitted limitation for approximately 4-6 hours on April 21, 1985, however this value is artificially high. Only 5 of 6 condenser water boxes were in service during this time; the sixth was opened to inspect for leakage, so that although there were 4 circulating water pumps in operation, there was significantly less flow than what we credit 4 pump operation from pump curve data. Since there is no mechanism to compensate for tnis flow reduction, or to physically measure the flow rate, we are obligated to report and use the full-flow 4 pump flow rate to calculate thermal discharge although se know that the actual flow rate was significantly less. Hence the actual thermal discharge is significantly less than the reported, calculated value.

8505310682 850515 PDR ADOCK 05000302 9  !

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W3P85-1036 -

-  : Page 2 Should'you wish~to discuss this matter further, please contact Chadi Groome-4

' of our Euclear Licensing Office at (504)~595-2846.

Very truly;yours,

, d R.P. Bdrkhurst Plant. Manager-Nuclear

• RPB/CDG/ch

- cc: .J. Dale Givens - LA DEQ

' US NRC - R.D. Martin - Region IV G.W.7Knighton.: ;NRR/

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