ML20086K575
| ML20086K575 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 12/28/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086K578 | List: |
| References | |
| AO-74-56, NUDOCS 8401270287 | |
| Download: ML20086K575 (2) | |
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Mr. A. Giambusso
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Deputy Director of R; actor Projects Uni ted States Atomic Energy Commission
- Directorate of Licensing Washington, D.C.
20545.
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Walt Baunack, i
A.E.C. Region 1 Regulatory Operations Office on December 18, 1974.
Wri tten noti fication was made to Mr. James P. O'Reilly, Region 1 Regulatory Operations Office on December 18,-1974.
In accordance with Section 6.7.2.A of the Technical Specifications, Appendix A of DPR 44 for Uni t 2 ' Peach Bottom Atomic Power Station,- the following report is being submitted to the Directorate of Licensing as an Abnormal Occurrence:-
Re ference: License Number DPR-44 Technical Speci fication
Reference:
3 5.D Report No.:
50-277-74-56 Report.Date:
December 28, 1974-Occurrence Date: December 18, 1974 Faci li ty:
Peach Dottom Atomic Power. Station R.D. #1, Delta, Pennsylvania 17314 Identi fication of Occurrence:
Failure of RCIC Inverter on 20C19 panel.
Condi tions Prior to Occurrence:
Uni t 2 operating at 95% power.
c Description of Occurrence:
During steady-state plant operation, the RCIC Inverter on
- panel 20C19 tripped for no apparent reason.
Designation of Apparent Cause of Occurrence:
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Component failure wi thin the RCIC inverter. -
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l 8401270287 741228 PDR ADOCK 05000277 S
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D Mr. A. Giambusso Q
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t December 28, 1974 Page 2 i
s Analysis of Occurrence:
At the time of the inverte-tripping, all other Unit 2 Emergency Core Cooling Systems were operable. Failure of this inverter only pre-cludes proper operation in the automatic flow control mode. The rest of the RCIC system remains fully operational and functional under a low level start signal. The RCIC remains fully operable in the manual con-trol mode. The time from the initial tripping until a replacement de-vice was installed and checked was less than I hour. Therefore, the safety implications are minimal for this occurrence.
Corrective Action:
It was determined that the failure was within the RCIC in-verter itself by isolating it from its load and observing that it would only stay on for a few seconds. The inverter was immediately replaced with an identical good spare and returned to service. Recalibration of the automatic resec circuit has corrected the malfunction.
Failure Data; Six other trippings of RCIC inverters have been reported as Abnormal Occurrence Report Numbers 50-277-74-14, 50-277-74-20, 50-277-74-37, 50-277-74-39, 50-277-74-40 and 50-278-74-5.'
Very truly yours,'
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'i M. J. Cooney Ass 't Gen' t Superintendent Generation Division cc:
Mr. J. P. O'Reilly Director, Region i United States Atomic Energy Conaission 631 Park Avenue King of Prussia, PA 19406 t
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