ML20084T969

AOs BFAO-50-259/761W & BFAO-50-260/762W:on 760114,diesel Generator D Failed Monthly Surveillance Test.Caused by Failure of Hydraulic Actuator to Respond Properly to Signals from Electrical Governor

ML20084T969
Person / Time
Site:	Browns Ferry
Issue date:	01/23/1976
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Rusche B Office of Nuclear Reactor Regulation
Shared Package
ML20084T972	List: ML20084T969 ML20084T975
References
NUDOCS 8306240338
Download: ML20084T969 (2)

Text

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. .O d oP6o 76 4 mrILE corr TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374ot i

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January 23, 1976 gg#4 ,

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a Mr. Benard C. Rusche .

h N Director of Nuclear Reactor Regulation (;

U.S. Nuclear Regulatory Commission Washington, DC 20555 g ,e

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Dear Mr. Rusche:

THMESSEE VALLEY AUTHORITY - BROWNS FERRY EUCLEAR PLANT UNITS 1 AND 2 -

DOCKET NOS. 50-259 AND 50-260 - FACILITY OPERATING LICENSE DPR-33 AND ~

DPR ABNORMAL OCCURRDiCE 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 Ab'IHORITY

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• 1 rector of Power Production Enclosure CC (Enclosure):

Mr. Norman C. Moseley, Director U.S. Nuclear Regulatory Commission Regional Office 230 Peachtree Street, NW., Suite 818 Atlanta, Georgia 30303 8306240338 760123 PDR ADOCK 05000259 .

m COPY SENT REGTON

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ABNORMAL OCCURRENCE REPORT

' Report Number: BFAO-50-259/761WandBFAO-50-260/762W Report Date: January 23, 1976 Occurrence Date: January 14, 1976 1%cility: Browns Ferry nuclear Plant units 1 and 2 Idcntification 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 cooling water pumps and the fuel pool cooling pumps.

Descriotion of Occurrence .

At approximately 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br /> on January 14, 1976, diesel generator D failed to meet the requirements of the monthly surveillance test.

Designation of Aeparent Cause of Occurrence The hydraulic actuator of the diesel governor did not respond properly to the signals from the electrical svernor.

Analysis of Occurrence There was no an n ge to the plant equipment or structures nor were there any plant personnel injuries or consequences adverse to the health and safety of the publices a result of this occurrence. Equipment requiring backup auxiliary power was supplied by a redundant diesel-generator.

Corrective Action Diesel generator B was placed in service and tied to I-kVF shutdown board C to supply power to the IUESW pump on the south emergency equipment cooling water header. Oil was added to the hydraulic actuator and then adjusted; stability was ic ediately 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.

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