ELV-00790, Special Rept 1-89-02:on 890717,observed Valid Diesel Generator Failure.Caused by Remote Gate Firing Module on Bridge Circuit 1.Rework in Progress & Scheduled for Completion by 890814

Special Rept 1-89-02:on 890717,observed Valid Diesel Generator Failure.Caused by Remote Gate Firing Module on Bridge Circuit 1.Rework in Progress & Scheduled for Completion by 890814

ML20245J298
Person / Time
Site:	Vogtle
Issue date:	08/14/1989
From:	Hairston W GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
1-89-02, 1-89-2, ELV-00790, ELV-790, NUDOCS 8908170635
Download: ML20245J298 (2)

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. August.14, 1989  ;

l U. S. Nuclear Regulatory Commissi9n  ;

Attn: Document Control Desk i Washington,- D.C. 20555 l

V0GTLE ELECTRIC GENERATING PLANT I

' l NRC DOCKET.50-424 l DPERATING LICENSE NPF-68  ;

.SPECIAL REPORT i VALID DIESEL ~ GENERATOR FAILURE !i Gentlemen:

l In accordance with thel requirements of the Vogtle Electric. Generating Plant l Technical Specifications, Sections 4.8.1.1.3' and 6.8.2, . Georgia Power Company ,

submits the enclosed Special- Report concerning a valid -diesel generator j fail ure.

Sincerely,  !

[A]

W.. G. Hai rston, III j WGH,III/JH/gm '

Enclosure:

Special Report 1-89-02 c(w): Georgia Power' Company l Mr. C. K. McCoy  !

'Mr. G. Bockhold, Jr.

Mr. R..M.~Odom -

Mr. P.- D.' Rushton -

NORMS i

U. ' S. Nuclear Regulatory Commission.

L Mr. S. D. Ebneter, Regional Administrator

' Mr. J. B. Hopkins,' Licensing Project Manager, NRR

[ Mr. J. F. Rogge, Senior Resident Inspector,' Yogtle i t f.

8908170635 890814' FDR 8 ADOCK 05000424 FDC i a -- -- _ . _ _ \

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I ENCLOSURE' L V0GTLE ELECTRIC GENERATING PLANT

!- NRC DOCKET 50-424  ;

OPERATING LICENSE NPF-68  ;

TECHNICAL! SPECIFICATION ~SPECIAL' REPORT 1-89-02.

A. Requirement for Report This report is required in accordance with the Vogtle Electric Generating Plant's Technical Specifications, .Section 4.8.1.1.3. This section of the l

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- Technical Specifications requires that all diesel generator failures, valid or non-valid, shall be reported to the Commission in a Special l l Report pursuant to Technical'Specificatfnn 6.8.2 B. Description of Valid Failure for Train B Diesel Generator

.On July 17, 1989, Diesel Generator 1B was started for the monthly surveil-

-lance testing and loaded to approximately 5000 KW when the operator notice ,

spikes in the current and KVAR taeter readings. The generator was taken

' off-line and the field voltage remained unstable. The diesel was stopped l for further investigation by the system engineer. The cause of the {

problem was believed to be in the exciter. bridge or voltage regulator, so the bridge circuit ~ was switched from bridge No.1 to bridge No. 2 and the diesel . started. The surveillance was completed with no further problems..

The cause has been determined to'be the Remote Cate Firing Module on bridge circuit No.1. Rework is in progress and is scheduled to be ];

completed by August 14, 1989, i C. ' Summary i This failure, per Regulatory Guide 1.108, Section C.2.e.7, was the first valid failure in the. last 20 valid tests -and the fourth in the last 52 valid tests, which is the total number of valid tests to date on Diesel Generator 18.

Test frequency remains at 31 days in compliance with Table 4.8-1 of the Technical Specifications.

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