ML20210E553

NPDES Noncompliance Notification:On 860205 & 26,samples of Discharge Point 501 Exceeded Monthly Average Biological Oxygen Demand.Caused by Degradation of Biological Activity Associated W/Nalco & Ultrion 8155 Addition Sys

ML20210E553
Person / Time
Site:	Peach Bottom
Issue date:	03/15/1986
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	PENNSYLVANIA, COMMONWEALTH OF
References
NUDOCS 8603270409
Download: ML20210E553 (2)

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' s PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.OI. BOX 8699 PHILADELPHI A. PA.19101 1215 e41-4000 March 15, 1986 Department of Environmental -Resources Bureau of Water Quality Management One Ararat Blvd.

Harrisburg, PA 17110

SUBJECT:

Noncompliance with NPDES Permit Peach Bottom Ato: tic Power . Station Permit No. PA 0009733 Gentlemen:

DESCRIPTION OF NONCOMPLIANCE:

The monthly average Biological Oxygen Demand (BOD) of discharge point 501 (Sewage Treatment Plant) exceeded the permit limit for the month of February.

Dates Sample Taken: 2/05/86 2/26/86 Dates Results Received: 2/19/86 3/5/86 Results of Analysi.s: 37 mg/l 47 mg/l Monthly Average Analysis: 42 mg/l Monthly Average Permit Limitation: 30 mg/l Monthly Average CAUSE OF NONCOMPLIANCE:

The causa of the non-compliance was a degradation of biological activity associated with the initiation of the Nalco Ultrion 8155 ( Aluminum Chloride Coagulant) addition system. The.

reduction in biological activity resulted in inadequate treatnent of the sewage causing an increase in the biological oxygen demand. 8603270409 860315 PDR ADOCK 05000277 S PDR On February 10, 1986, addition of Nalco Ultrion 8155 was begun at the clarifier splitter box. The system was put in service using a manually operated feed system. The first few days the system appeared to be working well and showed low levels of phosphorus (maximum 2.2 ppm). On February 18, 1986 after a holiday weekend there wan a noticeable degradation in the sewage jIIgp treatment plant operation. A check of the aeration tank i a

inlicated a drastic reduction in biological activity. The vendor.

was contacted and use of the Ultrion was discontinued to allow

- -0 recovery. Communication with the vendor indicated that an overfeed may have occurred over the holiday weekend due to low plant flow rates. The overfeed may have shocked the system and resulted in the decline of the biological activity.

DURATION OF NONCOMPLIANCE:

i The duration of the non-compliance is unknown.

CORRECTIVE _A_CTION:

The Nalco system was taken out of operation on February 21, 1986 to allow recovery of the biological activity.

P_RE,VEN,TI,0N_O,P ,FUT,U,RE, ,O_CCURRENCES :

l When the Nalco system is returned to service in March, 4

1986, it will operate in proportion to flow.

Very truly yours, i

W. T. Ullrich Superintendent Nuclear Generation Division JAV/WTU:ala cc: Environmental Protection Agency Director Water Permits Branch Office of Nuclear , Reactor Pennsylvania Section 3WM52 Regulation i 841 Chestnut Building US Nuclear Regulatory CommissiG Philadelphia, Pennsylvania 19107 Commission

. Washington, DC '20555 Administrator, Region I 0+fice of Inspection and Enforcement U3 Nuclear Regulatory Commission 611 Park Avenue l; K.ng of Prussia, Pennsylvania 19406 i

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