ML20085M341

AO BFAO-7348W:on 731225,during Routine Surveillance Testing, HPCI Turbine Failed to Reach Rated Speed & Flow.Caused by Open Resistor in Woodward Unit Which Supplies 48-volt Dc Power to Governor Control Box.Resistor Box Replaced

ML20085M341
Person / Time
Site:	Browns Ferry
Issue date:	01/04/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085M343	List: ML20085M341 ML20085M346
References
AO-BFAO-7348W, NUDOCS 8311080265
Download: ML20085M341 (2)

Text

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s j TENNESSEE VALLEY AUTHOAITY CHATTANOOGA, TENNESSEE iT^ li 37401 L i  !. 2-Gl I*

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3""""U "> 1974 g, 'd\ .),0,4#RK Mr. John F. O'Learf, Director hh i , W, J,'erk f

Directorate of Licensing 7,

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U.S. Atcaic Encrt;y Co=ission k Washinston, DC 20545 -

Dear Tr. O' Leary:

TENHESSEE'EALLEY AUTHORITI - 3:10WHS FERRY IR.TCLEAR PLANT UNIT 1 -

DOC:C:T UO. 50-259 - FACILITI OPZ3ATIUG LICEUSE DPR 1.3 HOR!'AL OCCUP. C CE REPORT 3FAO-734El i

The enclosed report is to provide details concerning HPCI failure which occurred on 3rouns Ferri Uuclear Plant unit 1 on December 25, 1973, and is submitted in cecordance with Appendix A to Regulatory

{ Guide 1.16, Revision 1, October 1973.

l Very truly yours, i

TEiHESSEE VALLEY AUTHORITY I '}

7E. F./ Thomas

/ Cr Director of Power Production i

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! Enclosure CC (Enclosure):

, Er, Narman C. Moseley, Director .

! Region II Regulatory Operations Office, USAEC l 230 Peachtree Street,131.

Atlanta, GeorSia 30303 I

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ABNOR!@.L OCCURRENCE REPORT .

Report No.-BFAO-73h8W Report Date--January 4, 1974 Occurrence Date--December 25, 1973 Facility--Browns Ferry nuclear Plant unit 1 Identification of Occurrence HPCI failure.

Conditions Prior to Occurrence . .

The unit was operating at 158o 1.st and 44o Ise. .

Description of Occurrence At approxi= ate],y 11:00 p.m., the HPCI turbine failed to reach. rated speed and flow during routine surveillance testing. The control valve came open on initiation, but returned 4-ediately to the closed position.

Desienation of Antarent Cause of Occurrence A resistor was open in the Woodward unit which supplies the 48-volt de power to the EG-M governor control box. Therefore, the governor was unable to give the control valve a proper control signal.-

Analysis of Occurrence Safe shutdown of the reactor would have been possible because the re=aining emergency core cooling systems were-operable.

Corrective Action The resistor box was replaced and a surveillance test was performed to

! demonstrate operability. The turbine performed satisfactorily.

Failure Data

, Resistor box, Woodward,-Part No. 8270-282.

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