ELV-02112, RO 1-90-06:on 900829,valid Diesel Generator (DG) Failure Occurred.Investigation Begun & Troubleshooting DG Run Made

RO 1-90-06:on 900829,valid Diesel Generator (DG) Failure Occurred.Investigation Begun & Troubleshooting DG Run Made

ML20064B064
Person / Time
Site:	Vogtle
Issue date:	09/24/1990
From:	Hairston W GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
1-90-06, 1-90-6, ELV-02112, ELV-2112, NUDOCS 9010040303
Download: ML20064B064 (2)

Text

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owoo Pow company

.,3 - 333 heomore Avenuo

,, Att rni Georgo 30308

. bephone 404 L26 3195 MaAng Ad@ess 40 Inerness Centor Parkwisy -

Post Othee Box 1295 D rmmgham. Alabama 35201 Telephone 205 B68 5501 September 24, 1990 ,,,, ,,,,, ,,,, s n,y.7, W. G. Hairston, til Son.or Vee ProSoort Nucles Operations ELV-02112 0606 Docket No. 50-424 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555 Gentlemen:

V0GTLE ELECTRIC GENERATING PLANT SPECIAL REPORT VAllD DIESEL GENERATOR FAILURE

.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 a valid diesel generator failure.

Sincerely, td h < l 4 W. G. Hairston, III WGH,III/NJS/gm

Enclosure:

Special Report 1-90-06 xt: Georaia Power Company Mr. C. K. McCoy

' Mr. G. Bockhold, Jr.

Mr. P.:D. Rushton Mr. R. M. Odom 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 Ok $b$bk $O0$$$24 S PDC /

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ENCLOSURE l l

V0GTLE ELECTRIC GENERATING PLANT - UNIT 1 i TECHNICAL SPECIFICATION SPECIAL REPORT l-90-06 l VALID DIESEL GENERATOR FAltVRE j A. REQUIREMENT FOR REPORT This report is required in accordance with the Vogtle Electric Generating i Plant Technical Specifications, Section 4.8.1.1.3. This secti n of the Technical Specifications requires that all diesel generator f6 lures, valid or ron-valid, be reported to the Commission in a Special Report i pursuant to Technical Specification 6.8.2. i 1

B. DESCRIPTION OF VALID FAILVRE OF DIESEL GENERATOR 1A On 8-29-90 at 0825 CDT, Diesel Generator (DG) 1A was started pursuant to  ;

its Technical Specification surveillance requir ' at. After loading to the grid, operators noticed erratic swings in the MVAR (Mega Volt Ampere ,

Reactance) loading. The system engineer was asked to investigate and at  !

0950 CDT, DG 1A was removed from the grid and shut down at the system i engineer's request. DG 1A was declared inoperable and a Limiting Condition for Operation (LCO) was entered. l l

An investigation was begun, and a troubleshooting DG run was made. This ]

run was also stopped after MVAR loads started swinging erratically, indicating that a malfunction in the voltage regulator had occurred. On I 8-30-90, another DG run was made to gather data in order to quantify the  ;

load swings. Although specific testing of the voltage regulator was j unable to confirm a malfunction, on-8-31-90 a replacement voltage '

, regulator was installed and several DG runs were made for calibration . ,

purposes and to check various performance parameters. On 9-1-90, a DG 1 operability run was made and, upon its successful completion, DG 1A was declared operable and its LCO was exited. The DG had been out of service for 65 hours7.523148e-4 days <br />0.0181 hours <br />1.074735e-4 weeks <br />2.47325e-5 months <br /> and 25 minutes.

C.

SUMMARY

This event is classified as a valid failure per Regulatory Guide 1.108, i Section C.2.e. This was the first valid failure in the past 20 valid I tests. There have been a total of 94 valid tests of DG 1A and 5 valid failures. The test frequency for DG 1A has been changed to once per 7 i days in accordance with Table 4.8-1 of the Technical Specifications. )

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