05000324/LER-1981-055-03, /03L-0:on 810614,during Test,Diesel Generator 1 Started,Then Immediately Tripped W/Concurrent Opening of Diesel Generator Output Breaker.Caused by Resistor AE8 Shorting to Ground.Resistor Replaced

/03L-0:on 810614,during Test,Diesel Generator 1 Started,Then Immediately Tripped W/Concurrent Opening of Diesel Generator Output Breaker.Caused by Resistor AE8 Shorting to Ground.Resistor Replaced

ML20009G107
Person / Time
Site:	Brunswick
Issue date:	07/08/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009G094	List: 05000324/LER-1981-055, Forwards LER 81-055/03L-0 05000324/LER-1981-055-03, /03L-0:on 810614,during Test,Diesel Generator 1 Started,Then Immediately Tripped W/Concurrent Opening of Diesel Generator Output Breaker.Caused by Resistor AE8 Shorting to Ground.Resistor Replaced
References
LER-81-055-03L, LER-81-55-3L, NUDOCS 8108030333
Download: ML20009G107 (2)

LER-1981-055, /03L-0:on 810614,during Test,Diesel Generator 1 Started,Then Immediately Tripped W/Concurrent Opening of Diesel Generator Output Breaker.Caused by Resistor AE8 Shorting to Ground.Resistor Replaced

Event date:
Report date:
3241981055R03 - NRC Website

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 14 75 REPORT DATE 80 EVENT DESf'AIPTION AND PROBABLE CONSEQUENCES h 10121 l During the performance of Diesel Generator Actual Loadine Test. PT 12.1.2a. No. 1 l

lal3l ldiesel generator started as required and tied to its emergency bus. E-1.

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IOlil Ithen immediately tripped with a concurrent opening of the diesel generator output l

l O l s i l breaker.

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oo LER 2-81-55 ATTACFMENT Facility: BSEP Unit No. 2 Event Date: 6-14-81 No. I diesel generator tripped as a result of a diesel lockout signal from lockout relay device, CSDB, model number HEA61B, that occurred when the lockout device relay coil became energized. Diesel lockout logic voltage dropping resistor, AE8, shorted to ground and the resulting electrical arc energized the 86DB relay coil. The device then initiated its protective function of tripping the diesel and opening the diesel generator output breaker. At no time did an actual trip condition exist which would have energized the device as designed.

Lockout relay device, 86DB, receives initiation input from any of three diesel l

protective relays:

1.

Diesel generator power directional relay, 32D (reverse power) 2.

Diesel generator overcurrent relay, 51V 3.

Loss of excitation relay, 40 An examination of the shunt resistor revealed a hole in its porcelain insulation approximately 1/16 inch in diameter. The resistor was replaced and tested for normal operation. The shunt resistors on the remaining three diesel generators were inspected with no problems ftind. A failure mode for this resistor insu-lation breakdown could not be identified. This is considered to be an isolated event.

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