ML20128P215

Special Rept 2-96-2:on 960921,start Attempt of Maint Run of DG2A Was Made But Engine Did Not Start.Caused by Loose Voltage Regulator Integrated Circuit Boards.Loose Boards Were Removed,Contacts Adjusted & Returned to Sockets

ML20128P215
Person / Time
Site:	Vogtle
Issue date:	10/10/1996
From:	Mccoy C GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
2-96-2, LCV-0893, LCV-893, NUDOCS 9610170179
Download: ML20128P215 (3)

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Grorgia Power Company 40 inverness Center Parkway Post Office Box 1295 Birmingham. Alabama 35201 Telephone 205 992-7122 I GeorgiaPower )

C.K.McCoy the soutton ehcrne sptom Vice President. Nuclear l vogtie Project October 10, 1996 i LCV-0893 Docket No. 50-425 U. S. Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555 Gentlemen:

VOGTLE ELECTRIC GENERATING PLANT SPECIAL REPORT 2-96-2 NON-VALID DIESEL GENERATOR FAILURES In accordance with the requirements of Vogtle Electric Generating Plant Technical Specifications (TS) sections 4.8.1.1.3 and 6.8.2, Georgia Power Company submits the enclosed special report concerning non-valid diesel generator failures.

Sincerely, k

C. K. McCoy CKM/TEW

Enclosure:

Special Report 2-96-2 xc: Georgia Power Company Mr. J. B. Beasley, Jr.

Mr. M. Sheibani  ;

NORMS U. S. Nuclear Reculatory Commission I Mr. S. D. Ebneter, Regional Administrator Mr. L. L. Wheeler, Licensing Project Manager, NRR Mr. C. R. Ogle, Senior Resident Inspector, Vogtle N z'#1g V~ \

l 9610170179 961010 5 PDR ADOCK 0500 S

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. . t VOGTLE ELECTRIC GENERATING PLANT - UNIT 2 TECHNICAL SPECIFICATION SPECIAL REPORT 2-96-2 I NON-VALID DIESEL GENERATOR (DG) FAILURES A. REQUIREMENT FOR REPORT This report is required in accordance with the Vogtle Electric Generating Plant Technical Specifications (TS), section 4.8.1.1.3, which requires that all diesel 1

generator (DG) failures, valid or non-valid, be reponed to the Commission in a l special report pursuant to TS 6.8.2.

B. DESCRIPTION OF FAILURES OF DIESEL GENERATORS 2A & 2B On September 21,1996, during a refueling outage, plant personnel prepared for a maintenance run of DG2A following engine overhaul. At approximately 0500 EDT, a start attempt was made, but the engine did not start. The engine was air ,

rolled several times in an effort to prime the fuel oil lines and filters that were l drained during the outage. Three more starts were anempted unsuccessfully.

Personnel removed caps located at high points in the fuel oil system and the engine was air rolled until fuel oil was observed. The engine was then started successfully 1

at 0615 EDT.

On September 22,1996, at 0753 EDT, DG2A was staned for testing. ARer about 50 minutes, the operator noticed unexplained shins in reactance. Although the operator was able to make adjustments as required to maintain reactance at appropriate levels, engineering was contacted. The system engineer observed l

some of the same symptoms and the engine was shutdown. An investigation found  ;

voltage regulator integrated circuit boards loose in their sockets. They were removed, their contacts adjusted, and returned firmly into their respective sockets.

At 1718 EDT, DG2A was restarted and operated successfully. i i

On September 22,1996, at 2116 EDT, DG2B was started for a pre-maintenance  ;

run, prior to engine overhaul. Operators were unable to synchronize the generator  !

to the grid and the engine was stopped. Troubleshooting determined that the synchronizing circuit had been deenergized as part of a scheduled electrical train outage. Power to the circuit was restored and, at 2254 EDT, DG2B was restarted and operated successfully.

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9 VOGTLE ELECTRIC GENERATING PLANT - UNIT 2 TECHNICAL SPECIFICATION SPECIAL REPORT 2-96-2 NON-VALID DIESEL GENERATOR (DG) FAILURES On September 29,1996, at 0921 EDT, DG2B was staned for a maintenance run.

At 1312 EDT, the engine was stopped when operators and maintenance personnel noticed a fire on the right bank turbocharger. The tube oil keep warm system pump was stopped after observing an oil leak near the turbochargers and the fire was promptly extinguished. A 1/4" tubing line had broken allowing tube oil to spray onto the right bank turbocharger. The tubing was re-routed and the 1/4" line was replaced with a 3/8" line. The diesel was cleaned and re-staned on September 30,1996, at 0426 EDT, and operated successfully.

C.

SUMMARY

The DG problem starts referenced above have been determined to be non-valid failures because the DGs were out of service.

DG2A has had one valid failure in the last 20 valid tests and one valid failure in the last 100 valid tests. DG2B has had no valid failures in the last 20 valid tests and two valid failures in the last 100 valid tests. The test frequency for DG2A and DG2B remains at once per 31 days in accordance with the requirements ofTS table 4.8-1.

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