ML20155D268

NPDES Noncompliance Notification:On 880531,conventional Wastewater Treatment Sys Discharge Exceeded Std 9.3 Units. Caused by Malfunction of Addition Sys.Discharge Immediately Terminated & Ph Found Above Limitations

ML20155D268
Person / Time
Site:	Mcguire, McGuire
Issue date:	06/08/1988
From:	Haller W DUKE POWER CO.
To:	NORTH CAROLINA, STATE OF
References
NUDOCS 8806150049
Download: ML20155D268 (2)

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Duxe Powen COMPANY F.O. BOX 331 M9 WILLIAM A. HALLER M W%GER secterRitenscu.stmcts 8 (7041373 R300 l June 8, 1988 l

Division of Environmental Management Water Quality Section ATTN: Central Files P.O. Box 27687 Raleigh, N.C. 27611 SUBJECT! Noncompliance Notification McGuire Nuclear Station (NC0024392)

File: MC-704.20

Dear Sir:

In accordance with Part II. A.2 of the McGuire Nuclear Station NPDES permit (NC0024392), this is to notify you of a noncompliance incident at McGuire Nuclear Station. This letter is a follow-up to the telephone notification to the South piedmont Regional Office on May 31, 1988. Information related to the incident is as follows:

Discharge The dischar.3e was the conventional Wastewater Treatment (WC) System, discharge 002.

Cause The pH exceeded 9.0 standard units. The pH reached a maximum of 9.3 standard units due to a malfunction of the CO2 addition system.

Date The incident occurred on May 31, 1988. The duration was approximately 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.

Prevention l

Discharge was immediately terminated when the pH was found above the limitations. The cause of the malfunction is under investigation. Once the investigation is complete, measures will be taken to correct any deficiencies that exist.

t i0 8806150049 880608 PDR ADOCK 05000369

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4 Sumary Flow to the pH instrumentation failed when a flow switch malfunctioned. As a result, CO was not being added to reduce the pH. An emergency work request was-i,hitiated to correct the problem. Flow to the instrumentation was restored, and an investigation was initiated to determine what caused the switch to malfunction. The maximum quantity of water discharged during the 5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> period was approximately 72,000 gallons. The WC System discharge combines with an additional flow from the Collection Basin prior to discharging to the Catawba River just downstream of Cowans Ford Dam.

The impact of this pH excursion was of minimum consequence to the environment.

Should you have any questions, please contact R.T. Simril at 373-2310 or M.C. Griggs at 373-7080.

l Sincerely, l W.A. Haller, Manager Nuclear Technical Services WTG/43/rhm xc: Rex Gleason Document Control Desk l

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