ELV-03627, Special Rept:On 920320 & 21,invalid Failures of DG 2A Occurred Due to Inadequate Fuel in Supply Lines & Governor Speed Increased Too Slowly.On 920322,DG High Vibration Trip Occurred Due to Defective Sensor.Sensor Replaced

Special Rept:On 920320 & 21,invalid Failures of DG 2A Occurred Due to Inadequate Fuel in Supply Lines & Governor Speed Increased Too Slowly.On 920322,DG High Vibration Trip Occurred Due to Defective Sensor.Sensor Replaced

ML20094S518
Person / Time
Site:	Vogtle
Issue date:	04/09/1992
From:	Mccoy C GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ELV-03627, ELV-3627, NUDOCS 9204150130
Download: ML20094S518 (3)

Text

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Banunju3n Nta n3 3'dO1 Teieuw e NS 2477 7122 m\

C, K McCoy Georgia Power

. IN 01'" "ce /M fa A-v" April 9,1992 ELV 03627 000319 Docket No. 50-425 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555 Gentlemen:

V0GTLE ELECTRIC GENERATING PLANT SPECIAL REPORT INVAllD DIESEL GENERATOR FAILURES In accordance with the requirements of the Vogtle Electric Generating Plant Technical Specifications, sections 4.8.1.1.3 and 6.8.2, Georgia Power Company hereby submits the enclosed Special Report concerning several invalid diesel generator failures.

Sincerely, C. K. McCcy CKM/NJS

Enclosure:

Special Report 2-92-3 xc: Georaia Power Company Mr. W. B. Shipman Mr. M. Shelbani NORMS U. S. Nuclear Reaulatory Commission Mr. S. D. Ebneter, Regional Administrator Mr. D, S. Hood, licensing Project Manager, NRR Mr. B. R. Bonser, Senior Resident Inspector, Vogtle a GUi;9 9204150130 920409 PDR ADOCK 05000425 [2 l/j S PDR

o V0GTLE ELECTRIC GENERATING PLANT - UNIT 2 TECHNICAL SPECIFICATION SPECIAL REPORT 2-92-3 DIESEL GENERATOR 2A INVAllD 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 all diesel generator (DG) failures, valid or nonvalid, be reported to the Commission in a Special Report pursuant to TS 6.8.2.

B. DESCRIPTION OF INVAllD FAILURES OF DIESEL GENERATOR 2A Following an 18 conth overhaul, DG 2A underwent several maintenance tests to prime, calibrate, or verify the functional capability of various DG components. Although these tests identified problems which were corrected as intended, some of the tests are considered to be invalid failures per Regulatory Guide 1.108 and are listed below.

DATE/TIMElEST) DESCRIPTIQti 3-20-92/1447 Failure to start due to inadequate fuel in supply lines.

Restart attempted in order to prime the lines.

3-20-92/1449 Failure to start due to inadecuate fuel in supply lines.

Restart again attempted in orcer to prime the supply lines.

3-20-92/1507 following a successful start, the DG was stopped due to the generator field not being properly shorted. The K1 relay was then latched in the shutdown position, properly shorting the field.

I i 3-20-92/1514 Failure to start due to the governor speed being increased too slowly to prevent engine start failure.

3-20-92/1516 Following a successful start, the DG tripped due to low lube oil and/or jacket water pressures, induced by slow speed increases. -

3-20-92/1545 Following a successful start, the DG was stopped to adjust the No. 7 right bank exhaust valves.

l. 3 20-92/2117 Following a :uccessful start, the DG was stopped due to i kVAR, field voltage and current swings. An " error amp."

microchip in the voltage regulator was replaced.

4 SPECIAL REPORT 2 92 3 (continued)

DIESEL GENERATOR 2A INVALID FAILURES DATE/ TIME (EST) ( (121108 3 21-92/1137 following a successful start, kVAR, field voltage and current swings occurred again and the DG was stopped. The voltage regulator was replaced.

3-22 92/1101 following a successful start, a DG high vibration trip occurred due to a defective vibration sensor. No actual vibration problems had occurred.- The defective sensor was replaced.

3-22-92/1830 following a successful start, the DG was stcpped to repair a fuel oil leak.

C.

SUMMARY

following completion of this maintenance testing and a valid surveillance test, DG 2A was declared operable and restored to service on March 23, 1992, at 1104 EST. Diesel Generator 2A has experienced no valid failures in the last 20 valid tests and 3 valid failures in the last 100 valid tests. The test frequency _ remains at once per 31 days in accordance with TS table 4.8 1 requirements, l

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