ML18283B050

LER 1976-001W-00 & LER 1976-002W-00 for Browns Ferry Units 1 & 2, Diesel Generator D Failed the Monthly Surveillance Test

ML18283B050
Person / Time
Site:	Browns Ferry
Issue date:	01/23/1976
From:	Eric Thomas Tennessee Valley Authority
To:	Rusche B Office of Nuclear Reactor Regulation
References
LER 1976-001W-00, LER 1976-002W-00
Download: ML18283B050 (3)

Text

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," NRC <STRIBUTION FOIE PART 50 DOCI(. MA CERIAL (TEMPORARY FORM)

CONTROL NO:~g F I LF ~ 1NCXDHNT FXI.H FROM: Tennessee Valley Auth. DATE Ol- DOC DATE REC'D LTR TWX RPT OTI.IE R

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'ENT NRC PDR SENT LOCAL PDR Bus.c CLASS UNCLASS PROPINFO INPUT NO,CYS REC'D DOCKET 0:

XXX 1 50-259 60 ENCLOSURES:

DESCRIPTION'etter trans the following....... Abnormal Occurrence iI 76-1w,and 76-2H, on 1-14-76, Concerning Diesel Generator D fail the monthly surveillahce test...

(l Copy Received)..:

PLANT NAME: Browns Ferry )I' 8 .2 FOR ACTION/INFC:RI'v)ATION

. DQ.NOT REMOVE LXC. ASST. M/16 cys ACRS ACKN0%LED<<D INTERNAL DISTRIBUTION EG HXLE VOLL)IHR/BUNCH N)XC PDR 'KRHGER/J. COLLINS XaH (2)

HlPC (3)

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BAHR SHAO EXTEnNAL DISTRIBUTION LOCAL PDR TXC NSXC D1STP.lBUTXON REUXSED 1-19-76 by D. CRUTC))FIELD, TEC)f IKVII'.tl COORDXNATOR

TENNESSEE Y AUTHORITY'g~)at, ~ .

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0 Mr. Benard. C. Rusche Director of Nuclear Reactor Re U.S. Nuclear Regulatory Commission Washington, DC 20555 pp'I+

Dear Mr. Rusche:

TENNESSEE VALLEY AUTHORITY - BROWNS FERRY NUCLEAR PLANT UNITS 1 AND 2-DOCKET NOS. 50-259 AND 50-260 - FACILITY OPRRATKNG LICENSE DPR<<33 AND DPR-52 - ABNORMAL OCCURRENCE REPORTS"BFAO-50-259/761W AND BFAO-50-260/762W The enclosed. report is to provide details concerning diesel generator D which failed. the monthly surveillance test and. is submitted in accordance with Appendix A to Regulatory Guide 1.16, Revision 1, October 1973.

This event occurred. on Browns Ferry Nuclear Plant units 1 and. 2.

Very truly yours, TENNESSEE VALLEY AUTHORITY'.

kuPower Production erector of Enclosure CC (Enclosure):

Mr. Norman C. Moseley, Director U.S. Nuclear Regulatory Commission Regional Office 230 Peachtree Street, NW., Suite 818 Atlanta, Georgia 30303

ABNORMAL OCCUEGKNCE REPORT I

Report Number: BFAO-50-259/763.N and. BFAO-50-260/762N Report Date: Janua~ 23, 1976 Occurrence Date: January 14, 3.976 Facility: Browns Ferry Nuclear Plant units 1 and. 2 Identification of Occurrence Diesel generator D failed the monthly surveillance test.

Conditions Prior to Occurrence The fuel for units 1 and 2 was removed from the reactor vessel and stored.

in the spent fuel pool. The diesel/generators are required. for the emergency cooing water pumps and. the fue3. pool cooling pumps.

Descriation of Occurrence At approximately 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br /> on January 3.4, 1976, diesel generator D failed.

to meet the requirements of the monthlysurveillance test.

Desi nation of A~parent Cause of Occurrence The hydraulic actuator of the diesel governor did not respond. properly to the signals from the electricalgovernor.

Analysis of Occurrence There >ras no damage to the plant eauipment or structures nor were there any plant personnel injuries o consequences adverse to the health and safety of the publices a result of this occurrence. Equipment recuir'g backup auxiliary power was supolied. by a redundant diese3.-generator.

Corrective Action Diesel generator B was placed in service and, tied. to 4-kV shutdown board. C to supply power to the KiBSN pump-on the south e .ergency equipment cooling water header. Oil was added to the hydraulic actuator and tnen "justed.;

stability was immediately improved.. The diesel then successfully passed the monthly surveillance test. The oil inventory in the hydraulic actuators of the other two diesel generators was checked. and. found to be satisfactory. The oil in the actuator of all,the diesel. generators will be checked. periodically for proper inventory.

Failure Data There were no associated equipment failures resulting from this occurrence.

The diesel governor is manufactured. by Woodward Governor Company.