ML20086G416
| ML20086G416 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/25/1975 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| RO-75-13, NUDOCS 8401110366 | |
| Download: ML20086G416 (2) | |
Text
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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET PHILADELPHIA, PA.19101
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Of fice of Nuclear Reactor Regulations
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I United States Nuclear Regulatory Commission Washington, DC 2055$
Dear Mr. Giambusso:
Subject:
Environmental Deviation The following Deviation was reported to Mr. Walt Bounack, Region 1, Of fice of Inspection and Enforcement, United States Nuclear Regulatory Cormiission on July 16, 1975
Reference:
License Number DPR-44/56 Environmental Technical Specifications -
Appendix B.2.1 Report No.:
50-277/ 278-75-13 Report Date:
July 25,1975 Deviation Date:
July 16,1975 Facility:
Peach Bottom Atomic Power Station Units 2 and 3 R.D. 1, Delta, Pennsylvania 17314 Identification of Deviation:
Two cooling towers simultaneously inoperative.
Conditions Prior to Deviation:
Unit 2 and 3 at approximately 50% power.
Description of Deviation:
The "C" cooling tower was out of service due to an apparent malfunction of a flow switch in the lift pump lube water supply line.
On the "B" tower the "F" f an was out of service with a fan drive motor failure.
The deviation occurred when the "B" tower "E" fan tripped due tc an faulty vibration switch, rendering the "B" tower " inoperative" since it only had 9 operable fans.
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2 Designation of Apparent Cause of Deviation:
Cause of deviation was setpoint drift in the "B" tower "E" f an vib' ration switch causing an erroneous high vibration trip of the fan.
Analysis of Deviation:
Due to the reduced plant power level and the remaining capacity of the "B" cooling tower wi th nine f ans still operable no change beyond the limits of background variations in measured river temperature was observed.
Corrective Action:
The f aulty vibration switch was replaced and the f an restarted.
The length of time the fan was out of service was one hour.
Failure Data:
None.
Very truly yours, fa W M.
Cooney f'/
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't Gen't Superintendent Generation Division cc: Mr. J. P. O'Rei ll y Director, Region 1 Office of Inspection and Enforcement United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 x