ML20108A367

NPDES Noncompliance Notification:On 960314,personnel Observed Sewage Overflowing from MH-07 & Into Storm Drain W-4.Caused by Blockage of Pipe Section Between MH-07 & MH-08.Sewer Contract Svc Pressure Cleaned

ML20108A367
Person / Time
Site:	Limerick
Issue date:	04/28/1996
From:	Boyce R PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Oneil S PENNSYLVANIA, COMMONWEALTH OF
References
NUDOCS 9605020242
Download: ML20108A367 (3)

Text

r}

Robert W.Boysa l . , Plant Manager

,g, Limerick Generating Staton v

l PECO NUCLEAR ncO ce. c-nv Limenck Generating Station A Unit of PECO Energy PO Box 2300 Sanatoga, PA 19464 0920 610 718 2 & O April 28, 1996 Steven J. O'Neil Chief, Operations Section Department of Environmental Resources Bureau of Water Quality Management Suite 6010, Lee Park ,

555 North Lane l Conshohocken, PA 19428

SUBJECT:

Limerick Generating Station, Units 1 and 2 ,

L Non-Compliance of NPDES Permit No. PA-0051926 l, l

Dear Mr. O'Neil:

i Description of the Non-Comoliance:

l At 1510 hours0.0175 days <br />0.419 hours <br />0.0025 weeks <br />5.74555e-4 months <br /> on March 14, 1996, while performing work activities in the vicinity of Manhole MH-07, station personnel observed sewage overflowing from MH-07 and into l

Storm Drain W-4. Manhole MH-07 receives input from the station's Work Management Center (WMC) restroom and directs flow into a sewage holding tank for routine removal. Prior to this incident, Storm Drain W-4 was aligned through a I

downstream 'Y' valve to allow flow into Outfall S-5.3, which discharges into the station's Holding Pond. While actions

, were being taken to isolate the flow to MH-07, sand bags and gravel were positioned around MH-07 to redirect the sewage flow away from Storm Drain W-4 and into MH-08 (i.e., manhole

upstream of MH-07). An estimated 20 to 30 gallons of sewage l

flowed into Storm Drain W-4 before the overflow was secured at 1520 hours0.0176 days <br />0.422 hours <br />0.00251 weeks <br />5.7836e-4 months <br />.

, Immediate inspection and sampling of Outfall 001 (i.e.,

! Schuykill River discharge) and the Holding Pond revealed no detectable amounts of sewage; however, the potential exists that a non-detectable quantity of sewage may have been discharged into the Schuykill River via the Holding Pond.

3 Since Permit No. PA-0051926 does not allow sewage dilution via the Holding Pond or sewage discharge via Outfall 001, this incident was conservatively determined to be a non-compliance of the subject permit.

f 9605020242 960428 ()

PDR ADOCK 05000332 i S PDR

1 L . l

= a April 28, 1996 Page Two Cause of the Non-Comoliancet:

The cause of the sewage overflow was blockage of the pipe section between MH-07 and MH-08. The blockage consisted of rags, paper towels, and various debris from the WMC restroom. The WMC is utilized by contractor personnel during station outages.

Actions to Prevent Recurrence: 1 l

1. A sewer contract service pressure cleaned the sewer line downstream of MH-07. A plan is currently being j developed to pressure clean the station's sewer lines )

on a periodic frequency. This plan is expected to be developed by April 30, 1996, and appropriate actions will be implemented as necessary.

2. An Event Bulletin, will be disseminated by June 1, l 1996, to station supervision and appropriate offsite

contractor management, to discuss this incident during 1 all-hands meetings and pre-job briefings. l l If there are any questions please do not hesitate to contact Mr. James L. Kantner at (610) 718-3400.

l Sincerely, M .-

l R. W. Boyce l

DMS:cah i

i

1 l

2 l

April 28, 1996 Page Three l

cc: U.S. Nuclear Regulatory Commission i Document Control Desk l Docket Nos. 50-352/353 '

Washington, D.C. 20555 T. T. Martin

Administrator, Region I, USNRC Docket Nos. 50-352/353 N. S. Perry USNRC Senior Resident Inspector, LGS  ;

Docket Nos. 50-352/353 I l

l Program Management Section (3WM52)

Permits Enforcement Branch Environmental Protection Agency l Water Management Division l Environmental Protection Agency  !

Water Permits Section l j~ Region III l 841 Chestnut Building:

Philadelphia, PA 19107 l

l

\

l I

l 4

1 0

f e

- - -_