ML20086G110
| ML20086G110 | |
| 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-76-33, NUDOCS 8401100071 | |
| Download: ML20086G110 (2) | |
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PHILADELPHIA ELECTR.C COMPAN'l 2301 M ARKET STREET gv@ CON PHILADELPHIA PA.19101 (215) 841-4 0oo S
4 August 23, 1976 9
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Mr. Victor Stello, Jr.
Director h
Division of Operating Reactors
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Office of Nuclear Reactor Regulations b
N United States Nuclear Regulatory Cormiission Washington, DC 20555
Dear Mr. Stello:
SUBJECT:
ENVIRONMENTAL DEVIATION The following deviation was reported to Mr. Phil Stohr, Of fice of Inspection and Enforcement, Region 1, United States Nuclear Regulatory Corm 11ssion on August 13, 1976.
Reference:
License Number DPR-44/56 Environmental Technical Specifications:
2.2.2 Report No.:
50-277/278-76-33 Report Date:
August 23, 1976 Deviation Data: August 13, 1976 Facility:
Peach Bottom Atomic Power Station Units 2 & 3 R. D. 1, Delta, PA 17314 Identification of Deviation:
The pH for the settling basin ef fluent exceeded the Environ-mental Technical Specification limit.
Conditions Prior to Deviation:
Settling basin operating with maximum holdup. Raw water sump in automatic mode of operation.
Descriotion of Deviation:
A daily routine grab sample from the settling basin ef fluent measured a pH of 3 7 The verification sample measured 4.2.
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u 50-277/278-76-33 n. Victor ::e:lo, Jr.
Augus-23,1976 P ga 2 Desicnation of Apparent Cause of Ce@ tion,:
The Alum feeder to the clarifier overf1cwed to the raw water The raw water sump when full, pumped the low pH water to the sump.
settling basin and the low pH alarm on the raw water sump pump discharge line failed to operate.
I Analysis of Deviation:
On August 13, the clarifier Alum solution pump suction line plugged with Alum causing the water level in the Alum solution / mixer tank to rise. Alum buildup on the linkage of the water supply valve prevented its automatic closure causing the Alum solution / mixer tank to overflow to the raw water sump which automatically pumps to the settling basin when full. Due to a coincident failure of the low pH clarm the operator was not alerted to the problem. Because there is a high dilution factor between settling basin flow and circulating water flow, the impact to circulating water pH and the environment was minimal.
Corrective Action:
1.
The settling basin was isolated and the raw water sump pump was stopped. The settling basin and the raw sump were neutralized. The pH of both were checked and normal operation resumed.
2.
The Alum solution / mixer tank overflow was stopped.
The water supply valve linkage was cleaned, the valve was tested and returneo to service. The Alum solution feed pump suction line was cleared and normal operation was resumed.
3 The high-low pH alarm was repaired, recalibrated, tested, and returned tn service.
1 4.
A high-low pH trip of the raw water sump pump is being installed, with completion estimated by August 27, 1976.
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Failure Data _:
Envi ronmental Deviation Reports 50-277/278-76-30,50-277/278-i i
76-31, 50-277/278-72-32.
f Very truly yours, I
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M. J. Cocney Superintendert Generation Division - Nuclear I
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