ML20086G267

Environ RO 76-1:on 760105,two Cooling Towers Became Simultaneously Inoperative.Caused by Worn Motor Bearings on Fans K & E.Failure of Fan L Under Investigation.Motor to Fan K Replaced & Repairs to Fan E in Progress

ML20086G267
Person / Time
Site:	Peach Bottom
Issue date:	01/15/1976
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Stello V Office of Nuclear Reactor Regulation
References
RO-76-1, NUDOCS 8401100499
Download: ML20086G267 (2)

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-w PHILADELPHIA ELECTRIC COMPANY ,71. ,n,yk/xnX is . ,

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PHILADELPHIA. PA.19101 4 saisie4 4ooo

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January 15, 1976 4 7  % M. .

Mr. Victor Stello, Jr., Director m fy g#.w - '

Division of Operating Reactor s Of fice of Nucicar Reactor Regulations United States Nuclear Regulatory Conmi ssion teshington, D. C. 20555

Dear Mr. Stello:

TEFTTE COPY

Subject:

Environmental Deviation The following deviation was reported to Mr. Walt Baunack, Office of Inspection and Enforcement, Region 1, Uni ted States Nuclear _

Regula tory Commi ssion on January 6,1976.

Reference:

License Number DPR-44/56 Environmental Technical Specification: 2.1 Report No.: 50-277/278-76-1 Report Date: January 15, 1976 Deviation Date: January 5, 1976 Faci li ty: Peach Bottom Atomic Power Station Units 2 & 3 R.D. 1, Delta, Pennsylvania 17314 ~

Identification of Deviation:

Two cooling towers simultaneously inoperative. .,

Conditions Prior to Deviation:

Unit 3 shutdown. Unit 2 operating at 97 2% power. The "A" ,

cooling tower out of service due to a previous lif t pump bearing failuref~

"C" cooling tower operabic. River flow 44,300 cfs. .

Description of Deviation: .-

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On January 5,1975, with the "K" fan out of service for maintenance, the "E" fan on the "B" cooling tower tripped due to a high vibration signal. Further inspection of the cooling tower -

revealed that the "L" fan motor was running but the fan was.not turning due to failure of the gear reducer drive uni t.

Desicnation of Apparent Cause of Deviation:' '

.b l Wbrn motor bearings on the "K" and "E" fans. The failure of I the "L" fan i s under i nvesti ga ti on . -

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Mr. Victor 5 elld, Jr. [0-277/278-76-1 Page 2 January 15, 1976 m

s Analysis of Devf adon:

Dif ferential tempentures between knnsy1yani u-Maryland State Line and Holtwood Dame have remained well withm Qe Pennsylvania State limi ts. The thermal impact of the deviation is; minimal due to reduced plant power production, the operability of thoC" cooling tower, and the remaining capacity of the "B" cooling tower with-eightfansstilloperabic.

x Corrective Action:

The motor on the "K" fan was replaced and the fan returned to service on January 12, 1976. Motor repairs to the "E" fan are in progress. Repairs to the "L" fan will be undertaken as expedi tiously as possible. s Very truly yours,  ;

M. . Cooney Su erintendent

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' Generation 91vi sio'n'- Nucicar cc: Mr . J . P . O ' Rei l l y Director, Region 1 _

~~ Office of Inspection and Enforcement ,

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U. S,. Nuclear Regulatory Conmission s-631 Park Avenue '

Ki'ng of Prussia, PA 19406

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