ML20085H118

AO BFAO-50-259/7451W:on 740923,HPCI Inverter Failed.Caused by Inverter Filter Network Capacitor Failure.Inverter Unit Replaced

ML20085H118
Person / Time
Site:	Browns Ferry
Issue date:	10/03/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Case E US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085H122	List: ML20085H118 ML20085H124
References
NUDOCS 8308300200
Download: ML20085H118 (2)

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TENNESSEE VALLE:( AUTHO AITY MMd' CHATTANOOGA, TENNESSEE 3i tn 37401 J 1. . ' A i

October 3, 1974 m J&

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PAATNE ASN A o 7c W <- N (k 3.

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\\7Y ' 31%@4% <Y< k Mr. Edson G. Case Acting Director of Licensing g pg3 e-e.  ;- X2f 9

._ C:  ; ,f/g Office of Regulation , g, ;,. . y U.S. Atonic Energy Co==ission /G s

Washington, DC 20545 m t'/

Dear Mr. Case:

TEIRESSEE VALLEY AUTHORITY - BROWS FERRY UUCLEAR PLANT UNIT 1 -

DOCKET UO. 50-259 - FACILITY OPERATHTG LICENSE DPR ABNORMAL OCCURRH CE REPORT BFAO-50-259/7451W The enclosed report is to provide details concerning the HPCI inverter which failed cnd is submitted in accordance with Appendix A to Regulatory Guide 1.16, Revision 1, October 1973. This event occurred on Browns Ferry Huclear Plant unit 1 on September 23, 1974.

Very truJy yours, TE EESSEE VALLEY AUTEORITY

/

E. F. Thomas

[DirectorofPowerProduction v

Enclosure CC (Enclosure):

Mr. Nome.n C. Moseley, Director Region II Regulatory Operations Office, USAEC 230 Peachtree Street, ml., Suite 818 Atlanta, Georgia 30303 8308300200 741003 PDR ADOCK 05000259

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/Bl 01tGL OCCURRE: ICE REPORT heport No.: EFAo-50-259/7h51U Report Date: October 3, 1974 Occurrence Date: Septe=ber 23, 1974 - -

Facility: Browns Ferry nuclear Plant unit 1 Identification of Occurrence .

The HPCI inverter failed.

Conditions Prior to' Occurrence The reactor was in cold shutdown condition.

Description of Occu-- ence The "HPCI Inverter Failure" enhunciation was observed by thd operator. The inverter chassis Pase was found to be blown. 'Aro subsequent atte= pts to replace the fase resulted in blown fuses.

Designation of Amarent Cause of Occurrence A capacitor, cc=ponent C2, in the inverter filter network failed.

- -. Analysis of Occu-rence . _ . - . .._ . . _ _

At the time of the inverter failure, the reacter uns in cold shutdown; and the HPCI system was not repaired to be operable. The inverter failure caused no damacc to c~.y syste=s, cc ponents, or structures. There vere no adverse effects on the health or safety of the public as a result of this failure.

_ Corrective Action The inverter unit was replaced,by the unit 3 inverter.

Failure Data -

The capacitor was ---ufactured by Sprague Electric Cc=pary with the fo11ow1r.g nameplate: . .

Sprc6ue Pcuerlytic 36D 3000 uf 250V DC $7117L e

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