ML20086G426

Telecopy AOs 50-277-75-62 & 50-278-75-61:on 750920,main Stack Flow Transmitters Failed.Caused by Lightning Strike. Damaged Components Replaced

ML20086G426
Person / Time
Site:	Peach Bottom
Issue date:	09/22/1975
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086G425	List: ML20086G422 ML20086G426
References
AO-50-277-75-62, AO-50-278-75-61, NUDOCS 8401110395
Download: ML20086G426 (1)

Text

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j PHILADELPHIA ELECTRIC COMPANY Peach Bottom Ato=ic Power Station Delta, Pennsylvania , _. _ ,

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Mr. James P.. O'Reilly, Director

- Office Of Inspection and Enforcenent ]

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Begion 1 United States suelear Regulatory Comnission, hg M4W}"%I.Cs(

631 Park Avenue King of Prussia, Pennsylvania 19kO6 ,

Subject:

Abnornal Occurrence 2k- Hour Noti fi c ation Confirming V. T. U11 rich's phone conversation with Mr. Robert McClintock, Region 1, United States 5uclear Regulatory Commission on September 21,1975

Reference:

License sunbers DPR kk and DPR-56 Technical Specification

Reference:

4.8.C.1 Report No.: 50-277-75-62 and 50-278-75-630 Report Date: September 22, 1975 Occurrence Date: September 20, 1975 Facility: Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 1731k

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Identification of Occurrence:

d Failure of the main stack flow transmitters.

t j . Conditions Prior to Occurrences i,

Unit 2 at about 555 power, Unit 3 shutdown.

Des'eription of Occurrence:

On the night of September 20, 1975, a lightning strike disabled both main' stack flow transmitters.

• Designation of Apparent Cause of Occurrence:

Lightning strike.

Analysis of Occurrence:

l i Flow rate prior to the strike was known and was being supplied by two f ,

dilution fans. These fans rensined on during the short time that the transmitters were out of service, so total stack flow during this perioc is known.' This occurrence has minimal safety implications.

Corrective Action: -

l The damaged conponents were replaced and the transmitters were returned to service.

I Failure Data:

i~ Previous failures of this type were reported as 50-277-75-51, i 50-278-75-38, 50-277-75-5k, and 50-278-75 hk.

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Very truly yours, j f & h g.e d f - -

W. T. Ullrich, Superintendent Peach Botton Atomic Power Station 8401110395 750930

! PDR ADOOK 05000277 PDR t

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