ML20091L051

NPDES Noncompliance Notification:On 911022,during Electrical Outage No Residual Chlorine Could Be Identified in Routine Weekly Sample.Fecal Coliform Analysis Yielded Concentration Greater That Daily Max Limit.Faulty Breaker Opened Manually

ML20091L051
Person / Time
Site:	Calvert Cliffs
Issue date:	10/30/1991
From:	Szymkowiak J BALTIMORE GAS & ELECTRIC CO.
To:	Carlotta Coates MARYLAND, STATE OF
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References
NUDOCS 9201270222
Download: ML20091L051 (1)

Text

, l I

BALTIMORE OASAND CHARLES CENTER e P,0. BOX 1475

• BALTIMORE. MARYLAND 21203 1475 l

CALVthi CLIFil NUCtlAR POWIR PLANT DIPAtletti j W,",NL'j/fd," """" " October 30, 1991 _i

)

1 Carol J. Coates Maryland Department of Environment 2$00 Broening Highway ,

Baltimore, Maryland 21224 i l

Dear Ms. Coates!

RE:'_ Maryland State Discharge Permit No. 86 DP 0187 and NPDES Permit No, MD0002399 On October 22, 1991, the Calverc cliffs Sewage Treatment Plant lost electrical

~

. power for approximately four (4) hours. During the electrical outage a ,

routine.. weekly effluent sample was:taken by an employee of the Maryland l Environmental Service. No residual chlorine was identified in the sample. A-fecal coliform analysis on this sample yielded a concentration of greater than l

'1600 mpn/100 mi sample which is greater than the daily maximum limit of 400  :

apn/100 mi sample.

The cause of this event was investigated and the failure was traced to a >

faulty breaker _that did not open correctly during a_ heating system overload.

Instead of the appropriate breaker opening,-the Motor Control Center master-breaker opcned causing a-total plant loss of electrical power. To prevent a ,

recurrence of this type of event the faulty breaker was manually opened and electrically. isolated._ The other circuit breakers on the same Motor Control '

. center will.be tested to ensure that they will open properly as designed.

No-impact upon theLreceiving water was observed. A Biochemical' Oxygen Desarvi and Total Suspended Solids sample taken-at the same time as the fecal coliform  !

sample indicated that these analyses were within NPDES daily-limits. The power outage was not long enough to allow untreated sewage waste to overflow from plant.-

If- you hava any questions regarding this information, please call me at .(301) 260 4020.

Sincerely, James Szymkoviak

Chemical Analyst cc: NRC 7

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