ML20137Y134

NPDES Noncompliance Notification:On 851031,fecal Coliform Colony Count of Monthly Sample from Discharge Point 101 Exceeded Monthly Average Permit Limit.Caused by Failure of Hypochlorite Pump to Maintain Adequate Flow to Contact Tank

ML20137Y134
Person / Time
Site:	Limerick
Issue date:	11/26/1985
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	PENNSYLVANIA, COMMONWEALTH OF
References
NUDOCS 8512100732
Download: ML20137Y134 (2)

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SUBJECT:

iNoncompliance with NPDES Permit Lj 1

Limerick Generating Station

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7e Permit No. PA 0051926 s

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DESCRIPTION OF NONCOMPLIANCE

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The fecal coliform colony. count of the monthly sample 4

.ifrom discharge point 101 (sewage treatment plant) exceeded

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, ' ithe monthly average permit limit.

-;Date Sample Taken:

10/31/85 i

'*Date Results Received: 11/18/85 y,_l CResults of Analysis:

600 colonies /100 mis

'. Permit Limitation:

200 colonies /100 mls (monthly average) 3 CAUSE OF NONCOMPLIANCE:

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JPlant Operations Roport and the Plant Services Log Book, the

' W (hypochlorite pump ~at the Sewage Treatment Plant (STP) failed hj.[6}

MSTP had been in a mEintenance outage for approximately two O< 'ito maintain adequate flow to the chlorine contact' tank.

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2 months, during which all.the tanks were pumped out to l4

' accomplish the maintenance tasks.

After completing the

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maintenance outage, the treatment process was started up g,4;, "

i.. October.22, 1985.

Sufficient biomass had to develop in the Mf?M '-

? process in order to achieve.a'. good removal efficiency prior i:p@ie,.,.

s m, ' ' sto sampling on October 31, 1985.

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DURATION OF NONCOMPLIANCE:

1cJv The approximate duration of this incident is estimated 3.IA to be between 11 and 19 hours2.199074e-4 days <br />0.00528 hours <br />3.141534e-5 weeks <br />7.2295e-6 months <br />.

This estimate is based on

%pg C available chlorine residual data and assumes the violation occurred sometime after 5 p.m. on October 30, 1985, and

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ended by 12 p.m.

(noon) October 31, 1985.

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. CORRECTIVE ACTION:'

m, On October 31, 1985, the plant operator, while et, performing the -daily rounds, observed the malfunctioning N.,

- hypochlorite pump and corrected the problem by flushing out

[:p the discharge line.

This allowed the pump to restore the N.

chlorine residual in the: final effluent.

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7 PREVENTION OF FUTURE OCCURRENCES:

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scheduled in the Preventative Maintenance Program to be Flushing of the hypochlorite pump discharge line will be p

' performed on a monthly frequency.

Replacement of the

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hypochlorite pump head assembly will be scheduled in the

[W Preventative Maintenance Program to be performed on a semiannual frequency.

h' Very truly yours, kWs 4

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W. T. Ullrich Superintendent Nuclear Generation Division 40 g!

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