ML20086F829

Environ 77-2:on 770109,total Suspended Solids for Settling Basin Effluent Exceeded ETS Limit.Caused by Excessive Flow Combined W/Solids from Clarifier.Settling Basin Isolated & Pumped Out to Reduce Solid Inventory

ML20086F829
Person / Time
Site:	Peach Bottom
Issue date:	01/19/1977
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Stello V Office of Nuclear Reactor Regulation
References
RO-77-2, NUDOCS 8401090521
Download: ML20086F829 (2)

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. . O O PHILADELPHIA ELECTRIC COMPANY IEFILE 00PY 2301 MARKET STREET p\ }h / IQ, PHILADELPHI A. PA.19101 <

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s; January 19, 1977 [ . b ];

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Mr. Victor Stello, Jr.

Director Division of Operating Reactor Office of Nuclear Reactor Regulations U.S. Nuclear Regulatory Conmission Washington, DC 20555

SUBJECT:

ENVIRONMENTAL DEVIATION The following deviation was reported to the Office of Inspec-tion and Enforcement, Region 1, United States Nuclear Regulatory Cormiis-sion on January 10, 1977

Reference:

License Number DPR-44/56 Environmental Technical Specifications: Section 2.2.2 Report No.: 50-277/278-77-2 Report Date: January 19, 1977 Deviation Date: January 9, 1977 F acility: Peach Bottom Atomic Power Station Units 2 f 3 R.D. I, Delta, PA 17314 Identification of Deviation:

The total suspended solids for the Unit 2 and 3 settling basin effluent exceeded the Environmental Technical Specification 2.2.2 limit.

Conditions Prior to Deviation:

Settling basin operating with maximum holdup. Raw water sump in automatic mode of operation.

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. 8401090521 770119 PDR ADOCK 05000277 -

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Mr. Victor Stello, Jr.

O O 50-277/278-77-2 January 19, 1977 Page 2 Description of Deviation _:

u, The daily turbidity measurement of the settling basin effluent was high and a gravimetric analysis for total suspended solids was run.

The net total suspended solids for the settling basin was 56 ppm greater than the river sample. Within four hours the settling basin effluent was back within Technical Specification limits.

Designatioa of Apparent Cause of Deviations bue to a buildup of suspended soli & in the clarifier, higher than normal blowdown rates had to be established. This excessive flow in combination with the solids from the clarifier caused solids build-up in the settling basin and carry-over into the effluent.

Analysis of Deviation:

Because the settling basin flow was being diluted by a f actor of approximately 2,000 with circulating water at the time, the suspended solids of the circulating water leaving the discharge canal was affected to a minor extent; therefore, the environmental impact was minimal.

Corrective Action:

The settling basin was immediately isolated. The solids were allowed to settle and normal operations were resumed when effluent qual-ity was within limits. The settling basin was pumped out to reduced solid inventory. The entire water demineralization system is under study, to find and eliminate sources of excess suspended solids.

Failure Data:

50-277/278-76-41, 50-277/278-76-15, 50-277/278-76-11, 50-277/

278-76-7, 50-277/278-76-5, 50-277/278-74-10 and 50 277/278-74-9 Very truly yours, M

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.Cooney[

Superintendent Nuclear Generating Division cc: Mr. J. P. O'Reilly NRC, Reg. Office

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