ML20151Y110

Special Rept 88-002:on 870206,18 & 0623 Invalid Diesel Generator Failure Occurred.Caused by Operator Error

ML20151Y110
Person / Time
Site:	Vogtle
Issue date:	04/22/1988
From:	Gucwa L GEORGIA POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
88-002, 88-2, SL-4483, NUDOCS 8805040346
Download: ML20151Y110 (3)

Text

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Georg a Po6er Cynpany

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vanax.ou ear saw and Lcem ng SL-4483 0875m X7GJ17-V540 April 22, 1988 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Hashington, D.C. 20555 PLANT V0GTLE - UNIT 1 NRC DOCKET 50-424 OPERATING LICENSE NPF-68 SPECIAL REPORT 88-002 INVALID DIESEL GENERATOR FAILURES Gentlemen:

In accordance with the requirements of the Plant Vogtle - Unit 1 Technical Specification section 4.8.1.1.3 and 6.8.2, Georgia Power Company is submitting the enclosed Special Report concerning invalid diesel generator failures.

Sincerely,

1. P m L. T. Gutwa PAH/Im

Enclosure:

SR 50-424/1988-003 c: Georaia Power Comoany Mr. P. D. Rice Mr. G. Bockhold, Jr.

GO-NORMS

> IL S. Nuclear Regulatory Commission Dr. J. N. Grace, Regional Administrator Mr. J. B. Hopkins, Licensing Project Manager, NRR (2 copies)

Mr. J. F. Rogge, Senior Resident Inspector-Operations, Vogtle 8605040346 S80422 PDR ADON 0500 g 4 S I

v . ,, r GeorgiaPower A ENCLOSURE f i

PLANT V0GTLE - UNIT 1 NRC DOCKET 50-424 '

OPERATING LICENSE NPF-68 SPECIAL REPORT 88-002 A. Requirement for Report L

This report is required in accordance with the Plant Vogtle - Unit 1 i Technical Specifications section 4.8.1.1.3. This section of the f Technical Specifications requires that all diesel generator failures, valid or nonvalid, shall be reported to the Commission in a Special Report pursuant to Specification 6.8.2 within 30 days. This report L is being submitted due to the recent clarification by the NRC -

Region II of the definition of an invalid failure.  !

B. Description of Invalid Failures for the Train A Diesel Generator On February 18, 1987 Start No. 1-87-0043 was attempted after performing maintenance activities on the Unit 1 - Train A diesel generator. Shortly after startup, the engine trisped. A subsequent I investigation revealed the valve from the fuel 011 day tank to the diesel was locked closed, thus starving the engine. Start attempts ,

1-87-0044 and 1-87-0045 were subsequently attempted, but a loose '

fitting of the right b?,nk turbocharger pressure switch prevented the t diesel from starting. Ihe operator noticed that the turbocharger oil pressure was above the trip setpoint for each start. The fitting was ,

tightened and the surveillance was completed with successful start I attempt 1-87-0046. These attempts (43,44,45) were invalid failures '

to start.

3 On June 23, 1987, start attempt 1-87-0055 was performed on the Unit 1 i i, - Train A diesel generator. The generator was paralleled to the grid l

and loading was in progress when the operator noticed air escaping i from some of the cylinder locks. The cutput breaker was tripped and the diesel was shut down. The cylinder locks had been left open ['

following the performance of the routine checks. The operator failed 2 to follow the procedure. This was an invalid failure.

f f

I t

0875m E-1 04/22/88 SL-4483 mm

Georgialbwer d ENCLOSURE (Continued)

SPECIAL REPORT 88-002 C. Description of an Invalid Failure for the Train B Diesel Generator On February 6, 1987, start no. 1-87-0036 was performed on the Unit I  !

- Train B diesel generator. While the generator was being paralleled to the grid, the operator allowed the KVAR to go negative for a percent of time sufficient that the loss of excitation relay tripped the output breaker and the diesel. For this event, the operator failed to follow a procedure. This was an invalid failure.

D. Summary All the above failures to start were. invalid ~ failures. .There was no change to the surveillance frequency since these were invalid  !

failures. '

I l

0875m E-2 04/22/88 SL-4483 mm