ML20044C613

NPDES Noncompliance Notification:On 930322,discovered That Sanitary Sys Manway Overflowed Approx 100 Gallons of Sewage Onto Ground.On 930324 & 25,pumps Experienced Problems Keeping Up W/Vol of Influent.Sand Filter Bypassed

ML20044C613
Person / Time
Site:	Mcguire, McGuire
Issue date:	04/01/1993
From:	Atherton N DUKE POWER CO.
To:	Gleason R NORTH CAROLINA, STATE OF
References
NUDOCS 9304090202
Download: ML20044C613 (2)

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' Duke Ibuer Company l Tieneration Servicr$ Department j G339 Hagers Rm Road i Huntersrdie. NC:807%7929 DUKEPOWER l

April 1, 1993 i Mr. Rex Gleason Regional Manager Water Quality Section Department of Environment, Health and Natural Resources 919 North Main Street Mooresville, N.C. 28115

Subject:

McGuire Huulear Star. ion NPDES Permit NC0024392 Sanitary System Bypasses and Overflow File: MC 702.13 Certified: P 384 361 020

Dear Mr. Gleason:

Pursuant to Part II, Section B.3 of the subject permit, this is a follow-up written report for recent bypasses at the McGuire Nuclear Station. The initial notifications were made to your office on March 22, 24, and 25, 1993, by Norma Atherton, Christine Odom, and -

John Carter of Duke Power Company.

On March 22, 1993, it was discovered that a sanitary system manway downstream of the McGuire Office Complex had overflowed.

Approximately 100 gallons of sewage overflowed onto the ground. It did not reach the waters of the Standby Service Nuclear Water Pond.

At first the problem was thought to be a malfunction of a lift station. Later it was determined to be a sewage ejector inside the plant. Maintenance was performed on the sewage ejector to i alleviate the problem. The system was returned to service.

On March 24, 1993, your of fice was contacted concerning the need to temporarily bypass the upflow sand filter of the sanitary system in order to mitigate an impending overflow of the sanitary lagoon.

The sand filter pumps were unable to keep up with the rising water level in the lagoon. The situation was made even more critical due l to an unusually heavy rainfall event in the preceding 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. l During the bypass which lasted 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />, the effluent from the l lagoon still flowed through the chlorinator prior to being discharged to the Waste Water Collection Basin.

l On the following day, March 25, 1993, the pumps were still experiencing problems keeping up with the volume of influent into the lagoon. As a result, permission to bypass the sand filter was requested. The sand filter was subsequently bypassed for a total 9304090202 930401 9 a l {}

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of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and repairs were performed on the pump. As before, all ;

effluent from the lagoon was passed through the chlorinator prior to discharge to the Waste Water Collection Basin. The system was ,

returned to service after the repairs to the pump were completed. I If you should need additional information or have questions, please !

contact Norma Atherton at (704) 875-5963.

Sincerely, ffrzw N Wu-15 Norma G. Atherton, Scientist Environmental Division, Water Protection Group  !

Generation Services Department i

cci Mr. Randy Kepler - NCDEMNR - Raleigh, N.C.

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