ML20086G943
| ML20086G943 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 04/18/1975 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086G946 | List: |
| References | |
| AO-75-20, NUDOCS 8401130062 | |
| Download: ML20086G943 (2) | |
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PHILADELPHIA ELECTRIC COMPANY 23O1 MARKET STREET PHILADELPHIA. PA.19101 1255)841-4000 April 18, 1975 Mr. A. Giambusso Director Division of Reactor Licensing Of fice of Nuclear Reactor Regulations United States Nuclear Regulatory Commission Washington, DC 20555 l
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Walt Baunack, Region 1, Office of Inspection and Enforcement, United States Nuclear Regulatory Commission on April 9, 1375 Written notification was made to Mr. James P. O'Reilly,' Office of Inspection and Enforcement, Region 1, United States Nuclear Regulatory Commission on April 9,19/5 In accordance with Section 6.7.2.A of the Technical Specifications, Appendix A of OPR-56 for Unit 3 Peach Bottom Atomic Power Station, the follo. wing report is being submitted to the Directorate of Reactor Licensing as an Abnormal Occurrence:
Reference:
License Number DPR-56 Technical Specification
Reference:
4.5.G Report No.:
50-278-75-20 Report Date:
April 18, 1975 Occurrence Date: April 8, 1975 Facility:
Peach Bottom Atomic Power Station R.D. I, Delsa, Pennsylvania
,17314 Identification of Occurrence:
Failure of LS-5222 to operate SV-5222 (RHR Loo'p "B" high point vent on low accumulator level).
Conditions Prior to' Occurrence:
Unit 3 operating at approximately 60%.
Description of Occurrence:
During a routine instrument surveillance test, the switch function of LS-5222, which operates SV-5222 to open the RHR Loop "B" 9 q' 'q V --
high point vent, failed. The alarm function of the switch did operate proper l y.
8401130062 750418 PDR ADOCK 05000278
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Mr. A. G!aMbusso 50-278-75-20 April.18, 1975 Page 2 Designation of Apparent Cause of Occurrence:
Broken wire on LS-5222.
Analysis of Occurrence:
Since the RHR loop was full prior to the test, the low accumulator level alarm was proven functional, and the operation would respond to the low level alarm to ensure that the system was maintained full, the safety implications of this failure are minimal.
Corrective Action:
I Investigation revealed that a wire within the LS-5222 switch case had been pinched and broken. The wiring was repaired and the level switch successfully tested in accordance with the applicable surveillance test.
Failure Data:
One previous, reported as 50-277-75-4.
Very truly yours,
/
M. J. Cooney A
't Gen'! Sup rintendent Generation Division cc:
Mr. J. P. O'Reilly, Director Region 1 Office of Inspection and Enforcement
.U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 1
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