ML20101S930

NPDES Noncompliance Notification:On 920608,sample Analysis for Fecal Coliform Indicated Concentration of 900 MPN/100 Mi Greater than Max NPDES Limit of 400 MPN/100 Mi.Cause Not Determined.Concentration of Chlorine Increased

ML20101S930
Person / Time
Site:	Calvert Cliffs
Issue date:	07/14/1992
From:	Harold Denton BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9207200155
Download: ML20101S930 (3)

Text

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B ALTIMORE OAS AND

, ELECTRIC l '. CHARLES CENTER

• P.O. R")X 1475 e OALTIMORE. MARYLAND 21203 1475 i

R E DENToN OtNERAL MANActn CALV[RT CLIFF $

July 14,1992 U. S. Nuclear Regulatoly Commission Washington, DC 20555 ATTENTION: Document Control Desk

SUBJECT:

Calvert Clih's Nuclear Power Plant Unit Nos.1 & 2: Docket Mos. 50-317 & 50-318 bbmittal of a Report Required by NPDES Permit No. hiD00023W Gentlemen:

In accordance w!th Section 3.2 of tne Non Radiological Environmental Technical Specifications, Appendix B, Part II, calosed is a copy of a letter reporting a recent violation of the NPDES permit for Calvert Cliffs Nuclear Power Plant. This letter is dated July 3,1992.

Should you have any furttier questions regarding this matter, we will be pleased to discuss them with you.

gruly yours, REl>/DWh*/d.vmhhjd Attachment cc: D. A. Brune, Esquire J. E. Silberg, Esquire R. A. Capra, NRC D. G. hicDonald, J r., N RC T. T. h1artin, NRC P. R. Wilson, NRC R. I hiclean, DNR J. II. Walter, PSC 1 gh

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• B ALTIMORE GASAND f .

ELECTRIC CHARLES CENTER-

• P.O. BOX 1475

• BALTIMCRE. MARYLAND 21203 1475 CALVERT Cuff 8 hDCLEAR POWER PLANT DEPARTNENT lM"dO/07 ***

3 July 1992 Mr. Frank Clurca Maryland Departmant of the Env;ronment 2400 Broening Highway

. Baltimore, Mayland 21224 Dear Mr. Clurca; i

< RE: Maryland State Discharge Permit No. 86-DP 0187, Monitoring Point 101 (Calvert Cliffs Sewage Treatment Plant Effluent)

On June 8,1992 a sample for fecal coliform analysis was taken of the Calvert Cliffs Nuclear Power Plant Sewage Treatment Effluent. The sample analysis indicated a fecal coliform concentration of 900 MPN/100 ml.which is greater than the daily maximum NPDES limit of 400 MPN/100 mi sample. The sample results were delivered to the Maryland Environmental Service (MES) Sewage Treatment Plant contractor employee on June 22,1992. The results were reported to the Calvert Cliffs Chemir,try Department on June 29,1992. A callwas made to the Maryland Department of the Environment on June 29,1992 to report the violation in accordt.nce with our NPDES permit. The violation was reported to Chuck Woodall of the Enforcement Group.

The cause'of this event was investigated and the failure for this event was not determined. The chlorination system was functional and the chlorine contact chamber had a measured residual chlorine concentration of 2 PPM earlier in the morning.-

o The Calvert Cliffs plant site was in a refueling and maintenance outage on one of the power generatica units. During outages there are a greater number of people on site and .

subsequently there is an increased sewage treatment effluent flow. The increased load may-producc temporary high flows that may not be adequately disinfected because the chlorination equipment by design cannot rapidly increase contact chamber chlorine o' aentration. To

= prevent a rcoccurrence of this everit, the concentration of chlorina in the contact chamber will be increased during these high flow periods to ensure adequate oisinfection. The l

dechlorination feed flow rate will be increased accordingly. There is also a possibility that the sample taken could have been contaminated during collection or analysis.

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No visualimpact upon the receiving water would be observed from this event. The effluent of the Sewago Treatment Plant was diluted with Bay water at a rate of 1.2 million gallons per minute on June 6,1992. A biochemicai Oxygen Demand and Total Suspended Solids composite sample collected taken at the same approximate sample time as the focal sample indicated the these analyses were within NPDES daily limits. The duration of this noncon.pliance is not known but it could not have been longer than 7 days. The next routir,e sample takoo on June 15.1992 indicated a focal coliform concentration of 4.0 MPN/100 ml.

$ gut,-mes A. Szyrd@wis, Chemical Analyst -

Chemistrij Programs Calvert Cliffs Nu,: lear Power Plant

Enclosure:

cc: Steve Cherry Chris Earls Nuclear Regulatory Commission l

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