ELV-03986, Special Rept:On 920819,discovered That Voltage Meter Did Not Respond Until 28 After Being Tapped Several Times. Caused by Erratic Meter Indications.Operators Advised of Proper Timing Method & Voltage Meter Replaced

Special Rept:On 920819,discovered That Voltage Meter Did Not Respond Until 28 After Being Tapped Several Times. Caused by Erratic Meter Indications.Operators Advised of Proper Timing Method & Voltage Meter Replaced

ML20114C145
Person / Time
Site:	Vogtle
Issue date:	08/28/1992
From:	Mccoy C GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ELV-03986, ELV-3986, NUDOCS 9209010243
Download: ML20114C145 (2)

Text

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mn ' August 28, 1992 ELV-03986 000579 Docket No. 50-425 U. S. Nuclear Regulatory Commission _

ATIN: Document Control Desk Washington, D. C. 20555 Gentlemen:

V0GTLE ELECTRIC GEhiRATING PLANT SPECIAL REPORT n J1(VALID 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 an invalid diesel generator failure.

Sincerely, k _

C.K.McCog CKM/NJS

Enclosure:

Special Report 2-92-6

. xc: Georoia Power Cgroany -

Mr. W. B. Shipnan Mr. M. Sheibani NORMS Q. S._thtclear Reaulatory Commisdgn

- Mr. S. D. Ebneter, Regional Administrator Mr. D. S. Hood, licensing Project Manager, NRR Mr. B. R. Bonser, Senior Resident Inspecto , Vogtle D'iOO9G

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4 V0GTLE ELECTRIC GENERATING PLANT - UNIT 2 TECHNICAL SPECIFICATION SPECIAL REPORT 2-92-6 DIESEL GENERATOR 2B INVALJD FAILURE 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 invalid, be reported to the Commission in a Special Report pursuant to TF 6.8.2.

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B. DESCRIPTION OF INVALID FAILURE OF DIESEL GENERATOR 2B On August 19,-1992 at 0406 EDT, personnel performed a monthly surveillance g test on DG 2B. The DG was started, the operators observed-a slow response by the frequency meter, and the frequency was determined to be stabilized at 13.56 seconds. Additionally, the voltage meter did not respond until 28 seconds, after being t?pped several times. The acceptable time limit for obtaining normal frequmcy ano voltage is 11.4 seconds. At 0413 EDT, 'he DG was stopped, and an investigation was initiated into the cause of the event.

Several possible problem areas were evaluhted before it was concluded that the primary cause was erratic meter indications which led operators to believe that the DG was not operating within TS requirements for frequency and voltage respase. Additionally, the operator's method of timing the frequency response was improper. Although follow-up tests revealed no further r c tic meter indications, these tests verified that the DG was operating .ithin TS limits. ' Operators were advised of the proper timing method, and, as a precaution, the voltage meter was re'11 aced and the

. frequency meter was recalibrated and will bc replaced when a new one is made

- avail able. _

C. SUMARY This event had no effect on the ability of DG 2B to provide emergency power, and the DG was continuously available for emergency operation. Diesel generator 2B has experienced no valid failures in the last 20 valid tests and 1 valid failure in a total of 84 valid tests. The test frequency remains at once per 31 days in accordance with the reqrirements of TS table 4.8-1, 1

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