ML20086G430
| ML20086G430 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/30/1975 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso Office of Nuclear Reactor Regulation |
| References | |
| AO-50-277-75-54, AO-50-278-75-44, NUDOCS 8401110405 | |
| Download: ML20086G430 (2) | |
Text
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PHILADELPHIA ELECTRIC COMPANY
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July 30, 1975 Mr. A. Giambusso, Di rector Division of Reactor Licensing Office of Nuclear Reactor Regulations United States Nuclear Regulatory Comission Washington, D.C.-
20555
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Tom Shedlowsky, Region 1, Office of Inspection and Enforcement, United States Nuclear Regulatory Commission on July 21, 1975. Wri tten noti fication was made to Mr. James P. O'Reilly, Office of Inspection and Enforcement, Region 1, United States Nucicar Regulatory Commission on July 21, 1975.
In accordance with Section 6.7.2.A of the Technical Specifications, Ap-pendix 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 Direc-torate of Reactor Licensing as an Abnormal Occurrence.
Reference:
License Numbers DPR-44 and OPR-56 Technical Specification
Reference:
4.B.C.i Report No.:
50-277-75-54 and 50-278-75-44
' Report Date:
July 30, 1975 Occurrence Date:
July 20, 1975 Facility:
Peach Bottom Atomic Power Station R.D. #1, Delta, Pennsylvania 17314 Identification of Occurrence:
Failure of stack flow transmitters.
Condi tions Prior to Occurrence:
Both units at appioximately 50% power.
Description of Occurrence:
On the evening of July 20, 1975, lightning apparently struck the main offgas stack, resultine, in damage to both offgas stack flow transmi t ters.
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led Mr. A. Giambus 50-1 75-54 & 50-278-75-44 July 30, 1975 Page 2 Designation of Apparent Cause of Occurrence:
Lightning strike.
Analysis of Occurrence:
Flow rate up the main offgas stack during normal operation is provided by dilution fans.
Two dilution fans were in service prior to the lightning strike and remained in service during the entire period that the flow transmitters were out of service.
Therefore, total offgas stack flow is known.
This permits an accurate deter-mination of total gaseous release during this period. This occurrence has little safety significance.
Corrective Action:
An inspection in the area below the main stack was performed immediately following the failure.
Repair of the electronics was ini tia ted.
One of the two flow transmitters was returned to service.
Repai r of the second transmi tter is awai ting replacement parts.
Failure Data:
Previous failures of this type were reported as 50-277-75-51 and 50-278-75-38.
Very truly yours, M.
. Cooney Asst. Geni. Supt.
Generation Division Mr. James P. O'Reilly ec:
Director, Region 1 Office of Inspection and Enforcement United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 l
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