ML20086G422
| ML20086G422 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 09/30/1975 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Boyd R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20086G425 | List: |
| References | |
| AO-50-277-75-62, AO-50-278-75-61, NUDOCS 8401110381 | |
| Download: ML20086G422 (2) | |
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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET
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September 30, 1975
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Mr. Roger S. Boyd, Acting Director
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- s-Division of Reactor Licensing Of fice of Nucicar Reactor Regulations United States Nuclear Regulatory Commission Washi ng ton, D.C.
20555
Dear Mr. Boyd:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Robert McClintock, Region 1, Office of Inspection and Enforcement, United States Nuclear Regulatory Comission, on September 21, 1975. Wri tten notification was made to Mr. James P. O'Reilly, Office of Inspection and Enforcement, Region 1, United States Nuclear Regulatory Commission on September 22, 1975.
In accosdance wi th Section 6.7.2.A of the Technical Specifica-tions, Appendix, A of DPR 44 and DPR-56 for Unit 2 and Unit 3 Peach Bottom Atomic Power Station, the following report is being submitted to the Di rectorate of Reactor Licensing as an Abnormal Occurrence.
Reference:
License Numbers DPR-44 and DPR-56 Technical Specification
Reference:
4.8.C.1 50-277-75-6' and 50-278-75-61.
2 Report No.:.
Report Date:
September 30, 1975 Occurrence Date:
September 20, 1975 l
Faci li ty:
Peach Bottom Atomic Power Station
(
l R.D. #1, Delta, Pennsylvania 17314 Identification of Occurrence:
Failure of the main stack flow transmitters.
Condi tions Prior to Occurrence:
Unit 2 at about 55% power, Unit 3 shutdown.
l Description of Occurrence:
On the night of September 20, 1975, a lightning strike disabled both main stack flow transmi tters.
Designation of Apparent Cause of Occurrence:
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Lightning strike.
8401110301 750930 PDR ADOCK 05000277 i OfqO
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50-277-75-62/50-278-75-61 Mr. Roger S, Boyd Page 2 September 30, 1975 Analysis of Occurrence:
Flow rate prior to the strike was known and was being supplied by two dilution f ans. These f ans remained on during the time that the transmitters were out of service, so total stack flow during this period is known. This occurrence has minimal safety implications.
Corrective Action:
The damaged components were replaced and the transmitters were returned to service. The PhiladcIphia Electric Ccmpany Engineeing Department has begun a study to provide corrective action for permanen,t resolution of this problem.
Failurs Data:
Previous failures of this type were reported as 50-277-75-51, 50-278-75-38, 50-277-75-54 and 57-278-75-44.
Very truly yours,
/
,M. J. Cooney Ass't Gen't Superintendent Generation Division cc:
Mr. James P. O'Reilly Director, Region 1 Office of Inspection and Enforcement United States Nuclear Reg'ulatory Comnission 631 Park Avenue King pf Prussia, PA 19406 e
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