ML20205P367

Special Rept:On 860407,valid Failure of Diesel Generator 2A Occurred & Generator Declared Inoperable.Caused by Fuel Racks Not Opening Due to Faulty Governor Booster Cylinder. Cylinder Replaced

ML20205P367
Person / Time
Site:	Catawba
Issue date:	05/07/1986
From:	Tucker H DUKE POWER CO.
To:	Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8605210380
Download: ML20205P367 (2)

Text

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DUKE POWER GOMPANY P.O. Box 33180

. CHARLOTTE, N.O. 38g.gg HALB. TUCKER __

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'; b',)'i 1 -2 e 1. 43 004) anMaan May 7, 1986 Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Connaission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Re: Catawba Nuclear Station, Unit 2 Docket No. 50-414 i

Dear Dr. Grace:

Pursuant to Technical Specification 4.8.1.1.3 and 6.9.2, please find attached a Special Report concerning the valid failure of Diesel Generator 2A which occurred nn April 7, 1986.

Very truly yours, t

Hal B. Tucker RWO:slb Attachment xc: Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 NRC Resident Inspector Catawba Nuclear Station 8605210380 860507 PDR S ADOCK 05000414 PDR l \

SPECIAL REPORT Diesel Generator 2A Valid Failure on 04-07-86

As required by Technical Specification 4.8.1.1.3 and Station Directive 2.8.1, the following information concerns the valid failure which occurred on Diesel Generator (D/G) 2A on April 7, 1986. This valid failure was the fourth failure within the last 20 valid tests for the Unit 2 Diesel Generators. Please note that as of April 7, 1986, the 2A and 2B Diesel Generators had only completed 20 valid tests (this includes four valid failures).

During the performance of PT/2/A/4350/02A (D/G 2A Operability Periodic Test), D/G 2A failed to start. This was caused by the fuel racks not opening. Also, D/G 2A fuel eductor had begun to leak again (previous leak contributed to failure described in Special Report dated May 1, 1986), thus allowing the fuel oil header to drain and become air bound, preventing a start. Since the fuel racks did not open on the attempted start, it was 1 determined that the governor booster cylinder was faulty and therefore did not build adequate hydraulic pressure in the governor to open the fuel racks. The governor booster cylinder was subsequently replaced, and the leak on the fuel oil eductor was repaired. D/G 2A was later restarted and verified operable by performing D/G 2A Operability Periodic Test.

The 2A D/G was declared inoperable on April 7,1986 at 1050 hours0.0122 days <br />0.292 hours <br />0.00174 weeks <br />3.99525e-4 months <br /> and was subsequently declared operable on April 12, 1986 at 1800 hours0.0208 days <br />0.5 hours <br />0.00298 weeks <br />6.849e-4 months <br />. Therefore, the 2A D/G was out of service 5 days, 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> and 10 minutes. It should be noted however that the outage on D/G 2A was prolonged to repair other miscellaneous items not affecting operability. At this time, the surveillance testing interval is 3 days which is in accordance with Section C.2.d.4 of Regulatory Guide 1.108 Revision 1 (Periodic Testing of Diesel Generator Units Used as Onsite Electrical Power Systems at Nuclear Power Plants).