ML20086K387

Telecopy AO 74-40:on 740821,static Inverter Power Supply in RCIC Tripped During Start of Recirculation Pump.Cause Unknown.Corrective Actions to Be Determined

ML20086K387
Person / Time
Site:	Peach Bottom
Issue date:	08/22/1974
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086K380	List: ML20086K377 ML20086K387
References
AO-74-40, NUDOCS 8401270057
Download: ML20086K387 (1)

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Abnormal Occurrence 24-Hour Notification

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Confirming Mr. R. S. Fleischmann's phone conversation with Mr. W. Emunack, f]

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A.E.C. Region 1 Regulatory Operations Office on August 22, 1974.

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Reference:

License Number DPR-44 Amendment Number i

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j Technical Specification Table 3.2.B Q

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50-277-74-40 c

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August 22, 1974 M=i

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Facility:

Feach Bottom Atomic Fower Station R. D. 1. Delta. Pennsylvania 17314 r

Identification of Occurrence:

I Static inverter power supply in the Reactor Core Isolation Cooling System (kCIC) tripped during the start of a Unit 3 recirculation pump.

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Conditions Prior to Occurrence:

The reactor was operating at 100% power.

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Description of Occurrences f

During a restart of a Unit 3 recirculetion pump following a surveillsace test, j

the Unit 2 RCIC inverter failure alara annuncasted in the mein control room.

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The inverter was imeediately reset.

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Designation of t.pparent Cause of Occurrence:

A high

'the cause of the trippings of the static inverter has not been found.

speed memory type recorder connected to the inverter input displayed a negative going spike just prior to the inverter tripping. An analysis of this 7

transient is now in progress.

bv fI Analysis of Occurrence:

At the time of the inverter tripping, all other Unit 2 Emergency Core Cooling Systems vere operable. Due to this and the short tima that the inverter vss tripped, this occurrence has minimal safety significance.

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Corrective Actions The trippings of the inverter are currently under investigation by the i.

Philadelphia Electric Company Engineering and Research Department.

Failure Data:

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Four other trippings of the RCIC inverter have been reported as A0-50-277-74-14 A0-50-27,7-74-20 A0-50-277-74-37 and AO-50-277-74-39.

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W. T. Ullrich, Superintendent 5

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