ML19254F012

LER 79-016/03L-0:on 791003,emergency Diesel Generator 3D Failed to Start for Monthly Tech Spec Test.Caused by Sticking of Woodward UG8 Dial Control Governor Load Limit Strap in Stop Position.Governor Replaced

ML19254F012
Person / Time
Site:	Point Beach
Issue date:	10/19/1979
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19254F011	List: ML19254F010 ML19254F012
References
LER-79-016-03L, LER-79-16-3L, NUDOCS 7911050346
Download: ML19254F012 (2)

Text

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DATE 80 7 60 61 COCK ET NLMBER EVENT DESCRIPTION AND PROBABLE CONSEOUENCES h o 2 At 0400 hours0.00463 days <br />0.111 hours <br />6.613757e-4 weeks <br />1.522e-4 months <br />, 10-3-79, the 3D emergency Diesel cenerator (one of two) l o 3 l failed to start fcr its montaly technical specification test. The 4D l o 4 l Diesel generator was started to verify its operability. The 3D Diesel I o 3 ggenerator was restored to service at 1720 hours0.0199 days <br />0.478 hours <br />0.00284 weeks <br />6.5446e-4 months <br />, 10-3-79, after comple- l 0 is (tion of repairs and a test run. Because the redundant energencv Diesel 1 O! generator was operable, the public health and safety was not affected. l oiy This event led to a degraded mode of operation permitted by T. S. I 30 7 6 3 SYSTEV CAUSE CAUSE COYP VALVE CODE COCE Sv8COCE CCMPCNENT CODE SLSCODE SLECOCE 7

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3 34 35 36 3e 40 41 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i io lThe GM Electromotive Division 999-20 Diesel canerator failed to start i It it Ilbecause the Woodward UG8 dial control governor (bulletin no. 03004G) I

, , ] load limit strap stuck in the stop position. The faulty governor was I i i, l replaced with a spare and was returned to the factory. I i a i I 7 3 3 80 ST S %PCWER OTHER STATUS OtS O RY DISCOV ERY DESCRlPTION i s lE l@ l ll 0 l 0l@l N/A l A l@l Operator observation ACTivlTY CONTENT RELEASE 0 CF RELE ASE AVOLNT OF ACTIVITY LCCATION OF RELEASE i a IZi@lZi@ltua i N/A i 7 d 9 10 11 44 45 80

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- - 2 ATTACHMENT TO LICENSEE EVENT REPORT NO. 79-016/03T-0 Wisconsin Electric Power Company Point Beach Nuclear Plant Unit 1 Docket No. 50-266 At 0400 hours0.00463 days <br />0.111 hours <br />6.613757e-4 weeks <br />1.522e-4 months <br />, October 3, 1979, the 3D emergency Diesel generator (one of two) failed to start for its monthly Technical Specification test. The 4D emergency Diesel gen-erator was immediately tested to verify its operability.

The GM Electromotive Division 999-20 Diesel generator failed to start because the Woodward UG8 dial control governor (bulletin or catalogue no. 03004G) load limit strap stuck in the stop or shutdown position.

This governor had been recently installed as a replace-ment for the identical original governor for preventive maintenance. There were no known problems with the original governor, but it had been in service since the original installation of the Diesel generator and it was felt that it should be replaced as a precautionary measure. The replacement governor had been ordered from the manufacturer and was a rebuilt unit. When the replacement governor was initially installed, the load limit strap did stick in the shutdown position on one occasion. The replacement governor was then removed, disassembled, inspected, reassembled, and installed. The problem did not recur during ceveral pre-service retests and the Diesel was then placed into service.

When the replacement governor failed on October 3, 1979, the original governor was still on site and was reinstalled.

After the Diesel generator successfully completed the monthly Technica.; Specification test, it was returned to service at 1720 hours0.0199 days <br />0.478 hours <br />0.00284 weeks <br />6.5446e-4 months <br />, October 3, 1979.

The factory replacement governor has been returned to the manufacturer.

The event led to a degraded mode of operation (reduced degree of redundancy) permitted by the Technical Specifications.

The public health and safety was not affected due to the operability of the 4D emergency Diesel generator 1269 346