ML20086F307
| ML20086F307 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 09/21/1977 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| RO-77-25, NUDOCS 8312210059 | |
| Download: ML20086F307 (2) | |
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PHILADELPHIA ELECTRIC COMPANY c 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHIA. PA.19101 12158841 4000 September 21, 1977
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Mr. Victor Stello, Jr.
IE FILE COPY' Director Division of Operating Reactors Office of Nuclear Reactor Regulations U.S. Nuclear Regulatory Commission Washington, DC 20555 i
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SUBJECT:
ENVIRONMENTAL DEVIATION l
Dear Mr. Stello:
The followir.g deviation was reported to Mr. Greenman, Office of Inspection and Enforcement, Region 1, United States Nuclear Regulatory Commission on September 12, 1977
Reference:
License Number DPR-44/56 Environmental Technical Specifications:
2.2.2 Report No.:
50-277/278-77-25 Report Date:
September 21, 1977 Deviation Date:
September 12, 1977 F aci lity:
Peach Bottom Atomic Power Station Units 2 and 3 R.D. 1, Delta, PA 17314 l
l Identification of Deviation:
l l
The pH for the settling basin effluent exceeded the Environmental Technical Specification limit.
1 Conditions Prior to Deviation:
Settling basin operating with long paths. Raw water sump in automatic mode of operation.
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50-277/278-77 25 September 21, 1977 Page 2
Description of Deviation:
The daily grab sample from the settling basin effluent on 9/12/77 measured a pH of 10.8.
The verification sample measured 10.8.
The Technical Specification limit is that pH shall be within the range of 6.0 to 9.0.
Designation of Apparent Cause of Deviation:
The investigation of this deviation could not determine the cause. The calibrations of the pH meters monitoring the effluent streams were checked and f ound to be correct. The pH of the raw water sump (the only automatic discharge point) was found to be within limits.
Based on the pH value found in the settling basin, it is believed that the water came from a neutralizing tank. The neutrali zing tank isolation valves were checked and no leakage was detectable. A review of water plant operations during the previous day was conducted with the water plant operators. No operating errors were identified. However, the only plausible explanation of the occurrence would be that an improper va l ve line up occurred during the discharge of a neutralizing tank approx-imately fourteen hours before the sample was taken.
Analysis of Deviation:
While the exact duration of this deviation is not known, it is believed to have been less than fourteen hours. Because the settling basin flow is diluted by a f actor of 10,000 with circulating water flow, the pH of the circulating water leaving the discharge canal was not affected. Therefore, there was no adverse environmental impact.
Corrective Action:
The settling basin was isolated and neutralized. After the pH was checked, the system was returned to normal operation.
Failure Data:
Environmental Deviation Reports -- 50-277/278-76-30,31,32, 33, 35, 36, 38, 39, 40; 50-277/278-77-11, 14, 18, 20, 23 Very truly yours,
[
M.
. Cooney 7
S rintendent Generation Division - Nuclear cc:
Mr. Boyce H. Grier NRC, Reg. Office i
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