ML20086G114

Environ RO 76-32:on 760811,pH for Settling Basin Effluent Exceeded ETS Limit.Caused by Faulty Ph Meter on Neutralizing Tank Discharge to Settling Basin.Settling Basin Isolated & Neutralized

ML20086G114
Person / Time
Site:	Peach Bottom
Issue date:	08/23/1976
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Stello V Office of Nuclear Reactor Regulation
References
RO-76-32, NUDOCS 8401100080
Download: ML20086G114 (2)

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

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e(// \ i Mr. Victor Stello, J,r. W Director Division of Operating Reactors Office of ?!uclear Reactor Regulations United States Nuclear Regulatory Commission Washington, DC 20555

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SUBJECT:

ENVIRON? ENTAL DEVIATION The following deviation was reported to Mr. Walt Baunack, Office of Inspection and Enforcement, Region 1, United States Nuclear Regulatory Commission on August.12, 197G.

REFERENCE:

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

2.2.2 Report No.: 50-277/278-76-32 Report Date: August 21, 1976 .

Deviation Date: August 11, 1976 Facility: Peach Bottom Atomic Power Station (

Units 2 & 3 R.D. 1, Delta, PA 17314 Identification of Deviation:

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

Conditions Prior to Deviation:

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

8401100080 760823 PDR ADOCK 05000277 8 ""

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• hr. Mictor Stello, Jr. '

50-277/278-76-32

' August 23, 1976 Page 2 Description of Deviation:

,The daily grob sanple from the settling basin effluent neasured a pH of 11.2. The verification sarple reasured 11.1. l I

Desicnation of 7pocrent Cause of Deviation:

A faulty pH reter on the neutralizing tank discharge to the settling basin allowed a tank that was not neutralized to be discharged into the settling basin.

Analysis of Deviation-On August 11, a neutralizing tank (narinum volure -

15,000 gallons) was discharged to the settling basin with a high pH. After the high pif in the effluent was discovered and the settling basin was isolated, the neutralizing tank pH meter was tested and found to defective (reading low). Because of the high dilution factor of settling basin fleu with circulating water flou, the change in pH of the circulating water and the .

environmental inpact were ninimal.

Corrective Tction:

The settling basin was isolated and neutralized after which it was returned to normal operation. The neutralizing tank pH noter was recalibrated and returned to service. To prevent '

l additional violations, operators have been instructed to obtain a sanple fron each neutrali=ing tank for pH reasurement before d tscharge to verify the operability of the inline pH reter.

Failure Data:

Environtental Deviation Reports 50-277/278-76-30 and 50-277/278-76-31.

Very truly yours, A/

!. . C y Superintendentf {

Coheration Division-Nuclear I cc: f!r. J. P. O'Reilly

, 4 Director, Region 1 Office of Insp. & Enforcerent l

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