ML20246Q361

Special Rept:On 890730,diesel Generator 2B Experienced Test Failure.Caused by Wear of Oil Seal Retainer Ring.New Rings Ordered Per Requisition 892864 & Will Be Installed During Next Scheduled Diesel Generator Maint Shutdown

ML20246Q361
Person / Time
Site:	Mcguire
Issue date:	08/29/1989
From:	Tucker H DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 8909120014
Download: ML20246Q361 (2)

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Document Control Desk- 1 di , Washington,; DCf.20555'-

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Subject:

McGuire Nuclear Station,1 Unit 2 l Docket No.-50-370' Special. Report Concerning Diesel. Generator:2B 3 . -

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l Gentlemen:

. Pursuant to Technica1 Specification (T.S.) 6.9.2 as specified by T.S. 4.8.1.1.3, '

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.. find attached a special' report concerning Diesel Generator.2B. '

.'If you"have any' questions,'please contact S.E. LeRoy at (704)'373-6233.

Very;truly yours,

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J xc: . Mr. S.D. Ebneter, Administrator Mr. P.K. Van Doorn l U.S. Nuclear Regulatory. Commission NRC Senior Resident Inspector ,

. Region II . .McGuire Nuclear Station  !'

'101-Marietta.St., NW, Suite 2900 Atlanta',' Georgia 30323 i i

Mr. , Darl Hood, Project Manager l Office of Nuclear Reactor Regulation U.S. Nuclear' Regulatory Commission

. Washington, DC '20555 INPO Records.CenterL i

' Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia .30339 QW gRG912OO14 890929 s

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, Document Control Desk i

Docket No. 50-370 August 29, 1989

( Attachment Duke Power Company McGuire Nuclear Station Diesel Generator 2B Special Report i On July 30, 1989 at 1658, Diesel Generator (DG) 2B was being tested per PI/2/A/4350/15B, 18 month performance test, when it experienced an Invalid Test Failure (Start Attempt No. 719). The failure was due to low crankcase vacuum (which could be by passed in an emergency).

Smoke sticks were used to determine the locations of the vacuum leaks. The only area where a leak could be detected was on the crank shaft oil seal. The oil seal was replaced. The vacuum was then checked and verified to be above the trip limit.

The old oil seal was in fair condition but did show signs of wear. Upon further investigation, the problem now appears to be wear of the oil seal retainer ring rather than the oil seals. New retainer rings have been ordered per requisition no. 892864. The retainer rings will be installed during the next scheduled DG maintenance shut down.

On July 30, 1989 at 1800, the DG was started and successfully tested (Start Attempt No. 720).

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