ML20086K391
| ML20086K391 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 08/03/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086K394 | List: |
| References | |
| AO-74-39, NUDOCS 8401270063 | |
| Download: ML20086K391 (2) | |
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PHILADELPHIA ELECTRIC COMPANY 6
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A'ugust 3, 1974 Mr. A. Giambusso Deputy Director of Reactor Projects United States Atomic Energy Commission Directorate of Licensing Washington, DC 20545
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was repor ted to Mr. Tom Shedlowsky, f..C.C.
Oc.gica : Ocqo sim r Cm ai
- ca. Giiiw v., Juiv 24, 1974. Weitten notification was made to Mr. James P. O'Reilly, Region I Regulatory Operations Office on July 24, 1974.
In accordance with Section 6.7.2.A of the Technical Specifications, Appendix A of DPR-44 for Unit 2 Peach Bottom Atomic Power Station, the following report is being submitted to the Directorate of Licensing as an Abnormal. Occurrence.
Reference:
License Number DPR-44, Amendment Number 1 Technical Specification Table 3.2.8 Report No.:
50-277-74-39 Report Date:
August 3, 1974 Occurrence Date:
July 23,1974 Facility:
Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:
Static inverter power supply in the Reactor Core Isolation Cooling System (RCIC) tripped during a start of a recirculation pump.
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Conditions Prior to Occurrence:
l The reacter has scrammed from 30Z pcwer just price to this lf
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Mr. A. Giambusso August 3,1974 Page 2 Description of Occurrence:
During a restart of a reactor recirculation pump, following a reactor scram, the RCIC inverter failure alarm annunciated in the main control room. The inverter was immediately reset.
Designation of Apparent Cause of Occurrence:
The cause of the trippings of the static inverter has not been found.
It is believed that the inverter trips due to a 0.C. bus trans-ient following the start of a large A.C. motor.
Analysis of Occurrence:
The operation of the RCIC system was not necessary at the time of the tripping. The reactor had just scrammed on a turbine trip from high reactor water level. Because of this and the immediate restart of the inverter this occurrence has minimal safety implications.
Corrective Action:
Philadelphia Electric Company, Engineering and Research De-partment, in conjunction with General Electric Company, has designed an input filter network to reduce or climinate the input spikes causing the inverter trippings. The modification is presently in the'last stages of review at General Electric. The modification instructions, with the parts necessary for implementation are expected on site durin~g the first week of September. The modification will be implemented as soon as possible.
l Additionally, the Unit 2 inverters will be modified for auto-l matic trip reset as soon as the parts are available..The Unit 3 in-l verters already have this. feature.
' Failure Data:
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A0-50-277-74-14, A0-50-277-74-20 and A0-50-277-74-37 Three other trippings of the inverter have been reported as
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Very truly yours,
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. Cooney Ass' t Gen'.! Superintendent l
Generation Division l
cc: Mr. J. P. O'Rei l ly Director, Region i United States Atomic Energy Commission l
631 Park Avenue
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