ML20085G757

AO BFAO-50-260/7424W:on 741104,HPCI Sys Inoperable Due to Blown Head Gaskets on Gland Steam Condenser & Flooding of Gland Steam Condenser Hotwell Pump Motor.Cause Unknown. Upper & Lower Condenser Head Gaskets Replaced

ML20085G757
Person / Time
Site:	Browns Ferry
Issue date:	11/14/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Case E US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085G761	List: ML20085G757 ML20085G788 ML20085G804
References
NUDOCS 8308290337
Download: ML20085G757 (2)

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ABNORMAL OCCURRE: ICE REPORT l

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Report No.: EFAO-50-260/7424W s  :

Report Date: November 11., 1974 Occurrence Date: Novc=ber 4, 1974 Facility: Browns Ferry Nuclear Plant unit 2 Identification of Occurrence The HPCI system was inoperable as a result of blown head gaskets on the gland steam condenser and flooding of the gland steam condenser hotwell purp motor.

Conditions Prior to Occurrence The unit was in a hot shutdoun condition following a reactor scram.

Description of Occurrence The HPCI was autonatieny initiated following a reactor scram at 0938 hours0.0109 days <br />0.261 hours <br />0.00155 weeks <br />3.56909e-4 months <br /> on Novc=ber 4,1974 The water level in the reactor was restored with no indication of trouble. A short time later, the HPCI room was inspected and no leaks were noted. At 1300 hours0.015 days <br />0.361 hours <br />0.00215 weeks <br />4.9465e-4 months <br />, grocnd indication was received on the gland steam condenser hotwell pu o motor. An investigation revealed that leakage from both the upper and lower head gaskets on the gland steam condenser had flooded the gland steca condenser hotwell pu=p and co+or.

Designation of Annarent Cause of Occurrence The exact cause has not been determined. -

Analysis of Occurrence Failure of the head gaskets on the gland steam condenser which caused the HPCI to become inoperable did not jeopardize unit operation or create a hazard to the public. The other core cooling systens were operable.

Corrective Action

1. The upper and lower head gaskets on the gland steam condenser were replaced.

2. The gland steam condenser hotwell pu=p =otor was dried out and meggered s satisfactorily. "

3. The HPCI was tested and returned to operable condition. .

4. A plant modification has been initiated which incorporates General Electric Co=pany's corrective action reco=nendations including provision of a metal cln ping ring with a gasket to support the present gasket and lowering the inlet cooling water supply relief valve setpoint. These recommendations will be considered by TVA Design and implemented when approved.

Failure Data PreviousfailuresarereportedonAbnormalOccurrenceReportNos.BFAO-50-260/7416W andBFAO-50-260/7417W. .

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- TENNESSEE VALl1 AUTHOAFTY r 1n m m CHATTANOOGA, TENNESS5E 37401 tj i \ s

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5 [q U 'y Mr. Edson G. Case T.}' '

Acting Director of Licensing '-8 /

Office of Re M ation 6., " ' @A U.S. Atomic Energy Co=:tission \g ' ' - a" -

Washington, DC 20545

Dear Mr. Case:

TE;NESSEE VALLEY AUTHORITY - BRO'GS FERRY HUCLEAR PLANT WIT 2 -

DOCKET I;0. 50-260 - FACILITY OPERATII'G LICEISE DPR ABUORI&L OCCURRE!CEREPORTEFAO-50-260/7424W ,

The enclosed report is to provide details concerning the HPCI systen which was inoperable as a result of blown head gaskets on the gland stea:2 condenser and flooding of the Bland steam condenser hi5twell pum motor and is submitted in accordance with Appendix A to Regulatory Guide 1.16, Revisicn 1, October 1973 This event occurred on Browns Ferry !!ucle m a"+ unit 2 en November h, 1974 Very truly yours, TEIITESSEE VALLEY AUTHORITY

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E. F. Thonas Director of Power Production Enclosure CC (Enclosure}:

Mr. Hornan C. Moseley, Director '

Region II Regulatory Operations Office, USAEC 230 Peachtree Street, IM., Suite 818 Atlanta, Georgia 30303 1ING L COPY 8Drr REGION $