ML20086K357
| ML20086K357 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 10/09/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-74-42, NUDOCS 8401270040 | |
| Download: ML20086K357 (2) | |
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PHILADELPHIA ELECTRIC COPiPANY.
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.. ; i 4 (215) U414ooo October 9, 1974 Mr. A. Giambusso Deputy Director of Reactor Projects Uni ted States Atomic Energy Comi ssion Directorate of Licensing Washington, DC 20545
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to tir. Wal t B auneck, A.E.C. Region 1 Regulatory Operations Office on September 29, 1974.
Written notification was made to tir. Jame s P. O 'Re i l l y, i,cg ion 1 Regulatory Oper ations Of fice on September jo, 1974.
In accordance with Section 6 7 2.A of the Technical Specifications, Appendix A of DPR-44 for Unit 2 Peach Bottom Atomic Pwer Stat ion, the following report is being submitted to the Directorate of Licensing as an Abnormal Occurrence.
Reference:
License ilumber DPR-44, Amendment flumber 1 Technical Specificatior. Reference 3 5.C Repor t ilo. :
50-277-74-42 Report Date:
October 9,1974 Occurrence Date:
September 29, 1974 Facility:
Peach Bottom Atomic Power Station R.D.
1, Deita, Pennsyivania 17314 Identification of Occurrence:
The power supply to the HPCI flow control was temporarily interrupted.
Conditiens Pricr to Occurrencc:
The reactor was operating at 73Z power.
Description of Occurrer.ce:
The HPCI static inverter failure alarm annunciated in the control roem.
An i nrr.e d i a te investigation into the s t at ic i nvec t u:
tripping disclosed that one of the d.c.
inverter power supply fuses
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Mr. A. Giambusso October 9,1974 Page 2 had blown. The fuse was replaced and the inverter was reset and re-turned to service.
Designation of Apparent Cause of Occurrence:
The power interruption was caused by a blown fuse in the d.c.
supply circuit to the HPCI static inver ter, No other systems were af fec ted since the fused circui t only supplies the HPC1 inverter.
Analysis of Occurrence:
The HPCI static inverter was inoperable for a maximum of 15 minutes. All other ECCS systems were opurabic at the time or' the trip-ping.
Due to the short duration of the power intercuption and the availabiiity of all other ECCS systems, this occurrence has minimal safety significence.
Correct ive Action:
The fuse in tn. d.c. supply circuit was immediately replaced.
An investigation of the d.c. distribution system supplying the inverter and the inverter itself, revealed no malfunctions that would have re-sulted in a power supply overiced. The inverter is operating satis-factorily since the replacement fuse was installed.
Failure Data:
This is the first occurrence of this type on this device.
Ver y truly yours, lol'l/-
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.M. Ji Cooney Ass't Gen't Superintendent Generation Division cc:
Mr. J. P. O'Reilly Director, Region i United States Atomic Energy Conmission 631 Park Avenue King of Prussia, PA 19406 L,
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