ML20086H937

Environ RO 75-8:on 750416,second Fan Lost on Cooling Tower C.Caused by Worn Motor Bearings.Fan D Drive Train Completed & Returned to Svc.Fan a Motor Removed,Bearing Replaced & Motor Returned to Svc

ML20086H937
Person / Time
Site:	Peach Bottom
Issue date:	04/28/1975
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A Office of Nuclear Reactor Regulation
References
RO-75-8, NUDOCS 8401200355
Download: ML20086H937 (2)

Text

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t 4 w-PHILADELPHIA ELECTRIC COMPANY l

1 2301 M ARKET STREET PHILADELPHIA. PA. ?9*01 (21518414ooo Apri1 28, 1975 "' '

Mr. A. Giambusso Director N/

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Division of Reactor Licensing j .'

Office of Nuclear Reactor Regulations j

• United States Nucicar Regulatory Commission "7.

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WashinJton, DC 20555 A.3, * O -

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Dear Mr. Giambusso:

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Subject:

Environmental Deviation '

The following deviation was reported to Mr. Wal t Bacnack, Office of Inspection and Enforcement, Region I, United States Nuc! car Regulatory Commission on April 17, 1975

Reference:

License Number DPR-44/56 Fnv i r onman.i- = 1 Technie:! specificet;c,.,, 2,;

Report No.: 50-277/278-75-8 Report Date: Apri1 28, 1975 Deviation Date: April 16, 1975 Facility: Peach Bottom Atomic Power Station*

Units 2 and 3 R.D. 1, Delta, Pennsylvania 17314 Identification of Deviation:

Loss of a second fan on the 'C ' cool ing tower.

Conditions Prior to Deviation:

Units 2 and 3 operating at nominal full power.

Description of Deviation:

With the tower in service, the 'A' fan tripped intermittently from high vibration.

_D_csignation of Apparent Cause of Deviation:

n Worn motor bearings.

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M M, g w 47?G 8401200355 750428 i

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PDR ADOCK 05000277 8 PDR COPY SENT REGION 2

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Mr. A. Giambusso O O -

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. April 28,.1975 Page 2 i

1 Analysis of Deviation:

A3 there were nine of cleven . fans running, there was no signifi-cant environmental consequences as a result of the inoperability of this fan. Tne water temperature ! caving the tower changed only slightly.

River flow during this period was in excess of 32,000 CFS. .

Corrective Action:

The remaining work on the "D" fan drive train, as reported in 50-277/278-75-3, was completed to return the tower to a condition of ten operabic fans. The ' A' motor was removed from the fan, the bearings

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• replaced, and the motor returned to service, making all cleven fans  ;

l operable'.

4 Failure Data: .

Environmental Deviation Reports 50-277/278-74-2, 50-277/ 278-75-1, 50-277/278-75-2, and 50-277/278-75-6.

Ver y truly yours, M./.Connev asp t Gen' l' Superintendent .

Generation Division cc: Mr. J. P. O'Reilly, Director Region 1 Office of Inspection and Enforcement

, . United States Nuclear Regulatory Commission 3 631 Park Avenue King of Frussia, PA 19406 i

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