View source for ELV-00909, Revised Special Rept Re Valid Diesel Generator Failure on 890719.Caused by Remote Gate Firing Module on Bridge Circuit 1.Rework on Module Completed & Circuit Returned to Svc

{{Adams
| number = ML20248C156
| issue date = 09/25/1989
| title = Revised Special Rept Re Valid Diesel Generator Failure on 890719.Caused by Remote Gate Firing Module on Bridge Circuit 1.Rework on Module Completed & Circuit Returned to Svc
| author name = Hairston W
| author affiliation = GEORGIA POWER CO.
| addressee name = 
| addressee affiliation = NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
| docket = 05000424
| license number = 
| contact person = 
| document report number = ELV-00909, ELV-909, NUDOCS 8910030380
| document type = REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER), TEXT-SAFETY REPORT
| page count = 2
}}

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{{#Wiki_filter:4 L'                                                                         (JPOrgia power COmDYG
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: w. o. Hairston, n' September 25, 1989 Senior Wce President ELV-00909 Nuclear Operations                                                             0023 i
Docket No. 50-424 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555 Gentlemen:
V0GTLE ELECTRIC GENERATING PLANT SPECIAL REPORT VALID DIESEL GENERATOR FAILURE In accordance with the requirements of the Vogtle Electric Generating Plant Technical Specifications 4.8.1.1.3 and 6.8.2, Georgia Power Company submitted -
a Special Report concerning a valid diesel generator failure by {{letter dated|date=August 14, 1989|text=letter dated August 14, 1989}} (ELV-00790).             Enclosed is a revision to.this Special Report which corrects two typographical errors and updates the status of the repair work to correct the cause of the failure.
Sincerely,                        ,
                                                                                                                                                                        ,,.c W./. ICLf W. G. Hairston, III WGH,III/NJS/gm i
c(w): Georaia Power Company                                                                         1 Mr. C. K. McCoy                                                                         !
Mr. G. Bockhold, Jr.                                                                    {
Mr. R. M. Odom                                                                           '
Mr. P. D. Rushton NORMS                                                                                    ,
U. S. Nuclear Reaulatory Commission                                                     ,
l                                                                                      Mr. S. D. Ebneter, Regional Administrator Mr. J. B. Hopkins, Licensing Project Manager, NRR Mr. J. F. Rogge, Senior Resident Inspector, Vogtle
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 #'.    , ,.4 ENCLOSURE V0GTLE ELECTRIC GENERATING PLANT 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 Technical Specifications requires that all diesel-generator failures, valid or non-valid,. shall be reported to the Commission in a Special Report pursuant to Technical Specification
                 -6.8.2.
B. Description of Valid Failure for Train B Diesel Generator On July 19, 1989, Diesel Generator IB was started for the monthly         I surveillance testing and loaded to approximately 5000 KW when the operator noticed spikes in the current and KVAR meter readings. The       l generator was taken off-line and the field voltage remained unstable.
                                                                                        ~
The diesel was stopped 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. .I.
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 Gate Firing Module on bridge circuit No. 1. Rework on the module      {
was completed and bridge circuit No. I was returned to service.
C. Summary 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        J Generator IB.
Test frequency remains at 31 days in compliance with Table 4.8-l' of the       i Technical Specifications.                                                      ;
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