ML20140D035

Special Rept 97-01:on 970317,test Failure of 1D-G-400, D Edg.Caused by Failed Emergency Start Preset Relay. Relay Was Immediately Replaced & Retest of D EDG Was Satisfactory

ML20140D035
Person / Time
Site:	Hope Creek
Issue date:	04/14/1997
From:	Bezilla M Public Service Enterprise Group
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LR-N970247, NUDOCS 9704220117
Download: ML20140D035 (3)

Text

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Publib Service Electric and Gas Company P.O. Box 236 Hancocks Bridge, New Jersey 08038-0236 Nuclear Business Unit APR 141997 LR-N970247 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 SPECIAL REPORT 97-01 HOPE CREEK GENERATING STATION 1 FACILITY OPERATING LICENSE NPF-57 l DOCKET NO. 50-354 )

' Gentlemen: l This special report is being submitted pursuant to Technical Specification 4.8.1.1.3 for a test failure of 1D-G-400, the "D" Emergency Diesel Generator (EDG).

On March 17, 1997, during a post maintenance test of the "D" EDG, '

the governor control would not shift from isochronous to droop to allow loading of the EDG to the grid. This condition is considered a valid test and failure pursuant to Regulatory position C.2.e of Regulatory Guide 1.108.

This failure was the third failure in the last 100 tests. The cause of the test failure was a failed emergency start preset relay. The relay was found in the pulled-in or picked-up state.

The root cause was therm 1 aging related fracture of the armature carrier plastic which wedged the moving carrier in the picked-up condition and resulted in electrical failure of the coil. This fracture is the first age related failure of Gould J series (J-13) relays at the Hope Creek station.

Corrective Actions included the immediate replacement of the relay and satisfactory retest of the "D" EDG. Additional actions, which had been previously identified, include replacement of all normally energized J-10 and J-13 series relays in the EDG system. The extent of useful life for these relays had been analyzed through lab tests, which predicted acceptable performance up to Refuel Outage 8 (Spring 1999). As a result of this failure, additional trending will be performed to detect failure trends for the EDG system relays.

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APR 141997 Document Control Desk LR-N970247 The "D" EDG was out of service for an additional 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> as a result of this test failure. The current test interval remains every 31 days pursuant to Technical Specification Table 4.8.1.1.2-1.

Sincerely,

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MarkBezi[la General Manager Hope Creek Operations 1

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APR 141997 Document Control Desk -3 LR-N970247 Attachments (3)

C Mr. H. Miller, Administrator - Region I U. S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Mr. D. Jaffe, Licensing Project Manager - HC U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 14E21 Rockville, MD 20852 Mr. R. Summers (X24)

USNRC Senior Resident Inspector - HC Mr. K. Tosch, Manager IV Bureau of Nuclear Engineering 33 Arctic Parkway CN 415 Trenton, NJ 08625 l

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