ML20086F835

Environ RO 76-40:on 761001,pH for Settling Basin Effluent Exceeded ETS Limits.Caused by Neutralizing Tank B Overflowing Into Neutralizing Tank A.Settling Basin Isolated & Neutralized

ML20086F835
Person / Time
Site:	Peach Bottom
Issue date:	10/08/1976
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Stello V Office of Nuclear Reactor Regulation
References
RO-76-40, NUDOCS 8401090533
Download: ML20086F835 (2)

Text

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. PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET PHILADELPHIA PA.19101 ,

(215 e414000 October 8, 1976 AMIN ' -~

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Hr. Victor Stello, Jr., Director , e Division of Operating Reactors -

i Office of Nuclear Reactor Regulations , .g s '"

l U.S. Nuclear Regulatory Comission L,u -

Washington, D.C. 20555

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SUBJECT:

ENVIRONMENTAL DEVIATION The following deviation was reported to Mr. Walter Baunack, Office of Inspection and Enforcement, Region 1, United States Nuclear Regulatory Comission on October 1,1976.

Reference:

LicenseNumberDPR-44/56 Environmental Technical Specifications: 2.2.2 i

Report No.: 50-277/278-76-40 Report Date: October 8, 1976 Deviation Date: October 1, 1976 i Facili ty: Peach Bottom Atomic Power Station Units 2 and 3 R.D. #1, Del ta, PA 17314 Identif' cation of Deviation:

The pH for the settling basin effluent exceeded the Environmental Technical Specification limit.

Conditions Prior to Deviation:

Settling basin operating normally. Raw water sump in automatic mode of operation.

Description of Deviation:

i mS$ The daily grab sample from the settling basin effluent 81 measured a pH of 11.0. The verification sample also measured 11.0.

Designation of Apparent Cause of Deviation: gysplT W %

n y During the discharge to the settling basin of "A" neutral-oc izing tank, which contained water having a pH within allowable limits,

$Q an anion unit rinse-down to "B" neutralizing tank, which already y contained high pH water, was begun. The "B" neutralizing tank over-e ci flowed into the "A" neutralizing tank as it was being discharged. The mam inline pH meter on the neutralizing tank discharge system failed to stop the discharge because its range switch was set on an.4.u imgo.LO per range.

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Mr. Victor Sts , Jr. '0-27_7/278-76-40 October 8, 1976

• Page 2 Analysis of Deviation:

The duration of the deviation was less than an hour. The settling basin flow was diluted by a factor of 10,000 with circulating wa ter flow; therefore, the effect on the final pH of the circulating water was minimal.

Corrective Action:

The s'e ttling basin was isolated and neutralized. The contents of both neutralizing tanks were neutralized. After the pH levels were checked, the systems were returned to normal operation.

The range of the inline pH meter was permanently set to the proper scale and the range selector switch was removed to prevent repeat of the error. The instrument was recalibrated and returned to service.

Very truly yours, i

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'M.J.k,o[one(y

, 4, Superintenden t Generation Division - Nuclear cc: Mr. J. P. O'Rei lly NRC, Reg. Office i

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