ML19289F130

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Forwards LER 79-023/04T-0
ML19289F130
Person / Time
Site: Peach Bottom Constellation icon.png
Issue date: 05/25/1979
From: Cooney M
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19289F131 List:
References
NUDOCS 7906040309
Download: ML19289F130 (2)


Text

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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.O. BOX 8699 PHILADELPHIA. PA.19101 1215)841 4000 May 25, 1979 Mr. Boyce H. Grier, Director' Office of Inspection and Enforcement Region I United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

SUBJECT:

Environmental Deviation The following deviation was reported to Mr. Greenman, Region I, Office of Inspection and Enforcement on May 15, 1979.

Reference:

Docket Number 50-277 Environmental Technical Specification 2.2.3 Report No: 2-79-23/04T-0 Report Date: May 25, 1979 Occurrence Date: May 15, 1979 Facility: Peach Bottom Atomic Power Station R.D. 1, Delta, PA 17314 Technical Soecification

Reference:

The pH of the sewage plant effluent exceeded the range of 6.0 to 9 0 of Environmental Technical Specification 2.2.3.

Description cd[ th e Event:

The daily grab sample from the sewage plant effluent measured a pH of 5.8.

Consecuences of Event:

The pH of the effluent was below 6.0 for less than four hours after discovery. The pH of the water entering the Conowingo Pond from the discharge canal was not affected because of the large dilution factor. The environmental impact was 1) insignificant. (

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Mr. Boyce H. Grier Page 2 May 25, 1979 2-79-23/04T-0 Cause of Event:

Sometime between the last sample taken on Monday, May 14 and the first sample on Tuesday, May 15, both air blowers supplying air to the aeration tank failed. Loss of aeration allowed the dissolved oxygen level to drop to zero and the aeration tank become anaerobic. Going.to an anaerobic condition causes the pH to drop, thus producing a low pH in the affluent.

Corrective Action:

Soda ash and a temporary air supply was added to the aeration tank to bring the effluent pH within Technical Specification limits. The failed air blowers have been repaired.

A modification to the sewage treatment plant to provide automatic pH control is presently under investigation.

Failure Data Twelve previous occurrences of pH deviations have taken place, the most recent being 2-79-17/04T-0.

Yours truly, hvW h M. J. Cooney Superintendent Generation Division-Nuclear Attachment ec: Director, NRC - Office of Inspection and Enforcement Mr. Norman M. Haller, NRC - Office of Management &

Program Analysis 2236 083