ML20147F362

Special Rept:On 880115,valid Failure of Diesel Generator 2B Occurred.Caused by Sensitivity of Diesel Generator Governor. Governor Adjusted

ML20147F362
Person / Time
Site:	Catawba
Issue date:	02/29/1988
From:	Tucker H DUKE POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NUDOCS 8803070329
Download: ML20147F362 (2)

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Duxe POWER GOMPANY >

P.O. BOX 33180 CHARLOTTF., N.O. 98949

- IIAL U. TUCKER Tutzenows vice Pne. i.T ' (704) GN1 WLG_BAR PROD 0CTIOUB i

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February 29, 1988 f

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Document Control Desk U. S. Nuclear Regulatory Coninission ,

. Washington, D. C. 20555

Subject:

Catawba Nuclear Station, Unit-2 Docket No. 50-414 Special Report Gentlemen: l pursuant to Technical Specification 3/4.8.1.1.3 and 6.9.2, please find attached a f Special Report concerning a valid failure of diesel generator 2B which.took place  ;

on January 15, 1988. Submittal of this report was delayed pursuant to my' January 4, 1988 letter.

Very truly yours, i

l Le Lt \

i Hal B. Tucker j

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/ JGT/1464/sbn i Attachment  !

xc: Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission  ;

Region II l 101 Marietta Street, NW, Suite 2900 i Atlanta, Georgia 30323 i Mr. P. K. Van Doorn NRC Resident Inspector

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j Catawba Nuclear Station

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8803070329 880229 PDR ADOCK 05000414

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> SPECIAL REPORT CATAWBA NUCLEAR STATION, UNIT 2 DIESEL GENERATOR 2B VALID FAILURE ON JANUARY 15, 1988 DUE TO DIESEL ENGINE GOVERNOR BEING OUT OF ADJUSTMENT A Valid Failure of Diesel Generator (D/G) 2B occurred on January 15, 1988, while Unit 2 was in Mode 6, Refueling. This was the third Valid Failure within the last 100 Valid starts of D/G 2B and the first in the last 20 Valid Starts.

Consequently, the current testing interval is 31 days, which is in accordance with Technical Specifications Surveillance 4.8.1.1.2. There have been 3 Valid Failures within the last 100 Valid Starts on Unit 2 D/Gs.

After performing a full load rejection t'est per PT/2/4350/15B, Diesel Generator 2B Periodic Test, D/G 2B was shutdown after it could not be paralleled. Work requests 6174 PRF was initiated to investigate oscillating DC volts, DC Amp:/,

Frequency, and engine fuel rack position.

The cause of the oscillations was found to be the sencitivity of the D/G governor. Work Request 6174 PRF found that adjustaent of the D/G governor was necessary, and the adjustment was subsequently performed. Two Invalid failures occurred during governor adjustment. While troubleshooting the oscillation problem, 3 Invalid Failures occurred which are identified in another Special Report dated February 29, 1988. The periodic test was later satisfactorily completed.

D/G 2B had been previously removed from service after the Unit entered the current refueling outage. D/G 2A was operable during the period in which this Valid Failure occurred on D/G 2B. The necessary corrective maintenance was performed within 35 hours4.050926e-4 days <br />0.00972 hours <br />5.787037e-5 weeks <br />1.33175e-5 months <br />.