ML20086F323
| ML20086F323 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 04/18/1977 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| RO-77-11, NUDOCS 8312210088 | |
| Download: ML20086F323 (2) | |
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PHILADELPHIA ELECTRIC COMPANY
.I 2301 MARKET STREET PHILADELPHIA. PA.19101
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April 18, 1977 gY h.
Mr. Victor Stello, Jr.
Director Division of Operating Reactors Office of Nuclear Reactor Regulations U.S. Nuclear Regulatory Commission Washington, D.C. 20555
Dear Mr. Stello:
SUBJECT:
ENVIRONMENTAL DEVIATION The following deviation was reported to Mr. Walter Baunack, Office of Inspection and Enforcement, Region I, United States Nuclear Regulatory Commission on April 7, 1977.
Re ference :
License Number DPR-44/56 Report No.:
50-277/278-77-11 Report Date:
April 18, 1977 Deviation Date: April 7, 1977 Facility:
Peach Bottom Atomic Power Station Units 3 and 3 R.D. 1, Delta, PA 17314 Identification of Deviation:
The pH for the settling basin effluent exceeded the Environmental Technical Specification limit.
Conditions Prior to Deviation:
Settling basin operating with long paths. Raw water sump in automatic mode of operation.
8312210088 770418 PDR ADOCK 05000277 S
PDR COPY SENT REGION
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w-50-277/278-77-11 Mr. Victor Stello, Jr.
April 18, 1977 Page 2 i
Description of Deviation The daily grab sample from the settling basin effluent 1
measured a p" of 4.3.
The verification sample also measure 4.3.
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I Designation of Apparent Cause of Deviation i
The regeneration of an anion and cation demineralization was begun without verification of the closure of the neutralizing pump discharge valve. Because this valve was open, the unneutralized tank began to drain by gravity to the settling basin, and thereby to the j
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river. Because the neutralizing tank pump was not running for the demineralization, the pH meter did not receive a sample, and did not indicate the flow of low pH water. When the operator completed l
the regeneration, he found the open discharge valve and closed it j
i immediately, preventing further discharge to the settling basin.
Analysis of Deviation Less than 8,000 gallons of low pH water was released during i
l this deviation. Because the effluent from the settling basin was being diluted by a factor of 10,000 at the time, the pH change in the circulating water leaving the discharge canal was minimal. Therefore the environmental impact was insignificant.
Corrective Action:
l The settling basin was isolated and neutralized. The system was then returned to normal operation. The operator involved and the other water plant operators were reminded of the ~ importance of verification of correct valve line-up before beginning water plant operations.
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Failure Data:
Environmental Deviation Reports Nos. 50-277/278-76-30, 50-277/278-76-32, and 50-277/278-76-40 Very truly yours, i
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M.
. Cooney
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Superintendent
.Gsneration Division-Nuclear cc: Mr. J. P. O'Reilly NRC, Reg. Office i
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