ML20091L034

NPDES Noncompliance Notification:On 911209,fecal Coliform Analysis Indicated Concentration Greater than 1600 mpn/100 Ml,Exceeding Limit.Caused by Improper Residual Chlorine Analysis.Test Kit Comparator Replaced

ML20091L034
Person / Time
Site:	Calvert Cliffs
Issue date:	12/13/1991
From:	Szmykowiak J BALTIMORE GAS & ELECTRIC CO.
To:	Carlotta Coates MARYLAND, STATE OF
Shared Package
ML20091K978	List: ML20091K975 ML20091L030 ML20091L034 ML20091L051 ML20091L061 ML20091L072 ML20091L085 ML20091L102 ML20091L111 ML20091L131 ML20091L142 ML20091L147 ML20091L153 ML20091L158 ML20091L170 ML20091L176 ML20091L188 ML20091L196 ML20091L211 ML20091L218 ML20091L221 ML20091L228 ML20091L229 ML20091L251 ML20091L264 ML20091L277 ML20091L287 ML20091L293 ML20091L300
References
NUDOCS 9201270215
Download: ML20091L034 (1)

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. CALTIMORE OAOAND ELECTRIC CHARLES CENTER

• P.O. BOX 1475 e BALTIMORE, MARYLAND 21203 1475 CALYtRT CLIFF 8 kUCLEAR POWER PLANT OtPARTMINT

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December 13,1901 Carol J. Coates Maryland De artment of Environment 2500 Broetag Highway Baltimore, Maryland 21224 Dear Ms . Coates RE: Maryand State Discharge Permit No. BO DP 0187 and NPDES Perm;t No. MD0002399, monitoring point 101.

On December 9,1991 at approximately 0000 a sample for fecal collform analysis was taken from Calvert Cliffs Nuclear Power Plant Sewage Treatment Plant effluent. The sample analysis indicated a fecal collform concentration of > 1600 MPN/100 mi sample which is greater than the daily maximum ilmit of 400 MPN/100 mi sample.

The cause of this event wat vestigated and the failure may be traced to an improper residual chlorine analysis periormed earlier in the day. The improper analysis may have indicated the correct concentration of chlorine in the chlorine contact tank when a low concentration of chlorine was actually present. To prevent a recurrence of this type of event the test kit comparator has been replaced. There is also a possibility that the sample was contaminated and indicated a false fecal collform concentration.

No impact upon the recolving water wouH be observed from this type of event. All other analyses taken at the same time as these samples were wrthin NPDES limits. The duration of this noncompilance is not known but Sewage Treatment Plant records do Indicate that the chlorination system was functioning as indicated by the daily change in hypochlortte tank levels.

Sincerely, i f Qames A.$I.ymkowiak

' Chemical Analyst

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Nuclear Regulatory Commission JAS:sb

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