ML20086F818

Environ RO 77-6:on 770208,total Suspended Solids for Sewage Plant Effluent Exceeded ETS Limit.Caused by High Flow Carrying Solids Over from Aeration Tank.Chlorine Contact Tank Cleaned & Solids Removed

ML20086F818
Person / Time
Site:	Peach Bottom
Issue date:	02/18/1977
From:	Cooney M, Ney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Stello V Office of Nuclear Reactor Regulation
References
RO-77-6, NUDOCS 8401090308
Download: ML20086F818 (2)

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PHILADELPHIA ELECTRIC COMPANY 2301 M'ARKET STREET

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PHILADELPHI A, PA.19101 M COM (215)841 4o00 February 18, 1977 l 4?-M *'Iy Mr. Victor Stello, Jr. '

N Director Division of Operating Reactors (Tj", [f

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Office of Nuclear Reactor Regulations  !(-. f[C 2 3 lW' .i U. S. Nuclear Regulatory Commission - u,s.sexws W#

4 WN Washington, DC 20555

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Dear Mr. Stello:

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Subject:

Environmental Deviation s-The following deviation was reported to Mr. Walt Baunack, Office of Inspection and Enforcement, Region 1, United Uthtes Nuclear Regulatory Commission on February 9, 1977. ,

Reference:

License Number DPR-44/56 Appendix B Environmental Technical Specifications:

Section 2.2.2 Report No.: 50-277/278-77-6  ?

Report Date: February 18, 1977 Deviation Date: February 8, 1977 .

Facility: Peach Bottom Atomic Power Station Units 2 & 3  : - ~

R. D. 1, Delta, PA 17314 Identification of Deviation:

The total suspended solids for the Unit 2 and 3 sewage plant effluent exceeded the Environmental Technical Specification 2.2.2 limith Conditions Prior to Deviation:

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The sewage plant was in the automatic mode.

Description of Deviation:

The daily turbidity measurement of the sewage plant effluent .

was high and a gravimetric analysis for total suspended solids gras run, The net total suspended solids for the sewage plant was 87.6 pp'ttgreater than the river sample. s i

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L G401090308 770218 4 PDR ADOCK 05000277 S ""

l vm i SENT REGION _-/ ~ 3.s.a

Mr. Victor S - o, Jr. , 50-277/278-77-6 Fsbrusry 18, 1977 Paga 2 '

. . I Designation of Apparent 'Ciuse:

The sample was taken during a period of high flow into the sewage plant. The greater than no. mal water input came from increased sanitary facility usage caused by the Unit 3 Refueling Outage. High flow carried solids over from the aeration tank into the chlorine contact tank and from there into the effluent. ' The follow-up sampic, taken following cleaning of the chlorine contact tank and after the flow had returned to normal, was within Technical Specification limits. ,

Analysis of Deviation:

Because the sewage plant effluent was being diluted by a facter of 50,000 with circulating water flow, the suspended solids level of.the circulating water leaving the discharge canal was not affected.

Iterofore, the environmental. impact was minimaI.,

Corrective Action:

i The chlorine contact tank was cleaned and the settled solids were removed. The Mechanical Engineering Division has been requested to investigate the installation of surge equalization basins as recommended by our censultant. Installation of an equalization system would help to prevent hydraulic surges,that cause suspended solids to be carried over into the effluent.

Failure Data:

50-277/278-77-4, 50-277/278-77-1, 50-277/278-76-44, 50-277/278-76-37, 50-277/278-76-34, 50-27?/278-76-28, 50-277/278-76-26, 50-277/278-76-7, 50-277/278-76-6. .

i Very truly yours,

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M. J. Cooney S perintendent Generation Division-Nuclear 4

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cc: Mr. J. P. O' Reilly Director, Region 1 Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 I

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