05000317/LER-1980-028-03, /03L-0:on 800515,during Performance of Routine Test,Diesel Generator 12 Failed to Reach Rated Speed in Less than 10-s Until Third Attempt.Caused by Intermittent Female Pin & Crack in Bakelite Spacer of Anphenol Connector

/03L-0:on 800515,during Performance of Routine Test,Diesel Generator 12 Failed to Reach Rated Speed in Less than 10-s Until Third Attempt.Caused by Intermittent Female Pin & Crack in Bakelite Spacer of Anphenol Connector

ML19318A091
Person / Time
Site:	Calvert Cliffs
Issue date:	06/13/1980
From:	Bauer E, Heibel R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19318A081	List: 05000317/LER-1980-028, Forwards LER 80-028/03L-0 05000317/LER-1980-028-03, /03L-0:on 800515,during Performance of Routine Test,Diesel Generator 12 Failed to Reach Rated Speed in Less than 10-s Until Third Attempt.Caused by Intermittent Female Pin & Crack in Bakelite Spacer of Anphenol Connector
References
LER-80-028-03L-01, LER-80-28-3L-1, NUDOCS 8006180443
Download: ML19318A091 (2)

LER-1980-028, /03L-0:on 800515,during Performance of Routine Test,Diesel Generator 12 Failed to Reach Rated Speed in Less than 10-s Until Third Attempt.Caused by Intermittent Female Pin & Crack in Bakelite Spacer of Anphenol Connector

Event date:
Report date:
3171980028R03 - NRC Website

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60 81 DOCKET NUM8ER 68 69 EVENT oATE 74 7%

RETORT oATE 80 EVENT nESCRIPTION AND PROSABLE CONSEQUENCES h ITT M i Durino the cerforrance of a routine test #12 diesel cenerator (DG) failed to 1

ITT3"I I reach rated speed in less than 10 seconds until the third attemot. The first I o 141 l attenot was at 0300. At 0320 the diesel was left runnino as recuired by F6 Tin i

.S. 3.8.1.1.

At 1005 #12 diesel was taken out of service for repairs. The T

io is i l DG was returned to service at 1600 on 5/15/80. Both offsite AC power sources I o I 7 l 1 and the redundant DG remained operable during the event. This is not a l o is i i repetitive occurrence.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 11101 l investication revealed an intermittentfemale contact oin and a crack in the bakelite t i 13 i i spacer of the amphenol. connector for the 250 RPti speed switch.

It is assumed that u..it of the soeed li l 2 l Ithis ennnectnr had hann mieh naloa 2+

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en-o iil3; l switch caused the starting circuit to time out and initiate a start failure and ii i4i Iexciter shutdown sonnanca ST

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LER NO.

80-28/3L DOCKET fl0.

50-317 EVEtiT DATE 05/15/80 REPORT DATE 06/13/80 ATTACH"ENT CAUSE DESCRIPTION ArtD CORRECTIVE ACTI0 tis:

(C0!1 tit!UED)

The amphenol female plug was replacad, The diesel is tested on a weekly basis and no further action is contemplated.

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