ML20091L051
| ML20091L051 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 10/30/1991 |
| From: | Szymkowiak J BALTIMORE GAS & ELECTRIC CO. |
| To: | Carlotta Coates MARYLAND, STATE OF |
| Shared Package | |
| ML20091K978 | List:
|
| References | |
| NUDOCS 9201270222 | |
| Download: ML20091L051 (1) | |
Text
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BALTIMORE OASAND CHARLES CENTER e P,0. BOX 1475
- BALTIMORE. MARYLAND 21203 1475 CALVthi CLIFil NUCtlAR POWIR PLANT DIPAtletti j
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October 30, 1991
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Carol J. Coates Maryland Department of Environment 2$00 Broening Highway i
Baltimore, Maryland 21224 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 0
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