ML20155E411

Special Rept:On 870218,Diesel Generator Train a Tripped Due to Locked Valve from Fuel Oil Day Tank to Diesel.Valve Subsequently Reopened & Loose Fitting on Right Bank Turbocharger Pressure Switch Tightened

ML20155E411
Person / Time
Site:	Vogtle
Issue date:	10/06/1988
From:	Hairston W GEORGIA POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NON-00301, NON-301, NUDOCS 8810120277
Download: ML20155E411 (3)

Text

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Cwcv9a Ibwer CorTW'y i 333 Piedrnont A enue AJ ar,ta. Georg's 30308 -

Te'ephone 434 C6 6526 l Ma, leg Aness Fbst Off<ce Box 4545 At'artta. Georta 30M2 (0;Hg'p,,(", twwon e..tc snwn )

n e ev c w at e NON-00301 f October 6, 1988 f I

U. S. Nuclear P.egulatory Comission ATTN: Document Control Desk Washington, D. C. 20555 i

PLANT V0GTLE - UNIT 1 NRC DOCKET 50-424 OPERATING L GENSE NPF-68 SPECIAL REPORT l INVALID DIESEL GENERATOR FAILURES l Gentlemen:

In accordance with the requirements of the Plant Vogtle - Unit 1 i Technical Specification section 4.8.1.1.3 and 6.8.2. Georgia Power Company is submitting the enclosed revised Special Report concerning invalid diesel generator failures. The enclosed report supercedes the special report  !

previously submitted by our letter SL-4805 dated June 17, 1988.

Sincerely, hl.k$ &

W. G. Hairston, !!!

TEW/stl

Enclosure:

Special Report 88-002, Revision 2 c: Georgia power Company Mr. P. D. Rice Mr. G. Bockhold, Jr.

Mr. M. Sheibani Mr. J. P. Kane GO-NORMS V0GTLE-N0DtS U. S. Nuclear Reaulatory Consnission 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 E$$kMh,bbc[: bb 56 s

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ENCLOSURE PLANT V0GTLE - UNIT 1 NRC DOCKET 50-424 OPERATING LICENSE NPF-68 d.'ECIAL REP.0RT 88-002 A. Requirement for Report This report is required in accordance with the Plagt Vogtle - Unit 1 Technical Specifications section 4.8.1.1.3. This section of the Technical Specifications requires that all diesel generator failures, valid or nonvalid, : hall be reported to the Connission in a Special Report pursuant to Specification 6.8.2 within 30 days. This report is being submitted due to the recent clarification by the NRC - Region

!! 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 af ter performing maintenance activities on the Unit 1 - Train A diesel generator.

Shortly af ter startup, the engine tripped. An investigation revealed that the valve from the fuel oil day tank to the diesel was locked closed. This valve was subsequently reopened. The engine had not been run since Start No. 1-87-0042 on 2-3-87 and it is not known when during the ensuing 15 day period that the valve was closed. A Locked Valve Manipulation Log was implemented on 2-24-87 to verify proper valve configuration. Later on February 18, 1987 Start No. 1-87-0044 was attempted but a trip occurred due to low turbocharger oil pressure, a normal trip function which is bypassed in the emergency mode. It was found that a pre-lube valve, which should be closed af ter starting, had been left open. Start No. 1-87-0045 was attempted and the pre-lube valve was closed in a timely manner. However, a low turbocharger oil pressure trip occurred again, even though a turbocharger oil pressure gauge registered a pressure above tne trip setpoint. A search discovered a loose fitting on the right bank turbocharger pressure switch. The loose fitting was tightened. l On June 23, 1987, start attempt 1-87-0055 was perfomed on the Unit 1 - Train A diesel generator. The generator was paralleled to the grid and loading was in progress when the operator noticed air escaping from some of the cylinder cocks. The output breaker was tripped and the diesel was shut down. The cylinder cocks had been left open following the perfomance of the routine moisture checks. The operator failed to follow the procedure and ensure that the cylinder cocks were closed. Emergency start capability was not affected.

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a GeorgiaPower A ENCLOSURE (Continued)

SPECIAL REPORT 89 002 C. Description of an Invalid Failure for the Train B Diesel Generator On February 6, 1987. Start No. 1-87-0036 was perfonned on the Unit 1 - Train B diesel generator. While the generator was being paralleled to the grid, the operator allowed the KVAR to go negative for a length l 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. Again, emergency start capability was not affected. l

0. Summary Since these invalid failures were not valid tests, the surveillance test frequency was not effected and remained at 31 days for Train A Diesel Generator, and at 7 days for Train B Diesel Generator, as defined by Technical Specification Table 4.8-1.

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