ML20086G416

Environ RO 75-13:on 750716,two Cooling Towers Simultaneously Inoperative.Caused by Setpoint Drift in Flow Switch of Lift Pump Lube Water Supply Line.Faulty Vibration Switch Replaced & Fan Restarted

ML20086G416
Person / Time
Site:	Peach Bottom
Issue date:	07/25/1975
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
References
RO-75-13, NUDOCS 8401110366
Download: ML20086G416 (2)

Text

I 1 O . O PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET

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PHILADELPHIA, PA.19101 ,

ss (2151 e414000 3V pthp@s *9Q, July 25, 1975 l l (y 0, f,) 'i' b

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Mr. A. Giambusso Y ',;; ,, (Q."

Director Division of Reactor Licensing

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n Of fice of Nuclear Reactor Regulations I {

United States Nuclear Regulatory Commission Washington, DC 2055$

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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.Mr. A. Giambusso July 25,1975

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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, M.

fa W

. Cooney f'/

A* '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