ML20086F316
| ML20086F316 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/05/1977 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| RO-77-18, NUDOCS 8312210073 | |
| Download: ML20086F316 (2) | |
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PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET 4
PHILADELPHI A. PA.19101 1215) 841-4ooo
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July 5,1977 s
N Mr. Victor Stello, Jr.
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Director
's Division of Operating Reactor s 0
Office of Nuclear Reactor Regulations 1 '.
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U.S. Nuclear Regulatory Coninission Washington, DC 20555
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SUBJECT:
ENVIRONMENTAL DEVIATION I
Dear Mr. Stello:
The following deviation was reported to Mr. Caphton, Office of Inspection and Enforcement, Region 1, United States Nuclear Regulatory Commission on June 24, 1977.
Reference:
License Number DPR 44/56 Environmental Technical Specifications:
2.2.2 Report No.:
50-277/278-77-18 Report Date:
July 5,1977 Deviation Date:
June 24,1977 Facility:
Peach Bottom Atomic Power Station Units 2 and 3 R.D. 1, Del ta, 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.
Description of Deviation:
The daily grab sample from the settling basin effluent on June l
24, 1977 measured a pH of 9.6.
The verification s le also measured 9.6.
l COPY SENT REGION l
i JUL 151977 I
B312210073 770705 771930463 PDR ADOCK 05000277 S
PDR j
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Mr. Victor Stello, Jr.
50-277/278-77-18 July 5,1977 Page 2
The problem occurred again the next day when the effluent from the set-Cling basin had a pH of 9.5 The Technical Specification limit is that pH shall be within the range of 6.0 to 9.0.
Designation of Apparent Cause of Deviation:
These deviations in pH resulted from through leakage of two valves which are located between the neutralizing tanks and the de-mineralizer regeneration waste sump (one valve per neutralizing tank).
Each valve is closed before the associated tank is neutralized and discharged. However, because the valves leaked, un-neutralized waste could be released to the settling basin when the waste sump pumps operated during a release from a neutralizing tank. The leakage from the valves occurred downstream of the pH meter; therefore, the pH meter could not detect or prevent the release of the un-neutralized waste.
Analysis of Deviation:
1 The duration of each deviation was less than one hour.
Because the settling basin effluent is diluted by a factor of 10,000 with circulat-ing water flow, the pH of the circulating water leaving the discharge canal was not affected, and therefore, the environmental impact was minimal.
1 Corrective Action:
Each time the settling basin was isolated and neutralized.
Af ter the pH was checked, the system was returned to normal operation.
The two leaking valves were repaired.
Failure Data:
Several previous instances of pH beyond Technical Specification limits have occurred; however, the causes were not the same as the above occurrences.
Very truly yours, h
M.
Cooney Su rintendent Generation Division - Nuclear-cc:
Mr. J. P. O'Reilly NRC, Reg. Office i
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