ML19331D734

LER 80-032/03L-0:on 800805,while Performing Special Load Test,Emergency Diesel Generator 1A Tripped When Loaded. Caused by Actuation of Field over-current Relay Below Design Setpoint.Relay Adjusted to Proper Value

ML19331D734
Person / Time
Site:	Crystal River
Issue date:	08/28/1980
From:	Heinamdy V FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19331D726	List: ML19331D725 ML19331D734
References
LER-80-032-03L, LER-80-32-3L, NUDOCS 8009030503
Download: ML19331D734 (2)

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8009030 5 0g

6 SUPPLEMENTARY INFORMATION Report No.: 50-302/80-032/03L-0 Facility: Crystal River Unit #3 Report Date: 28 August 1980 Occurrence Date: 5 August 1980 Identification of Occurrence: Failure to have the required number of A.C. electrical power supplies operable contrary to Technical Specifi-cation 3.8.1.1. Conditions Prior to Occurrence: Mode 3 Hot Standby nascription of Occurrence: At 1840 while performing PT-106, Special Load Test of Emergency Diesel Generator "A", the generator tripped when the ES Bus was loaded by starting fans AHF-18 and AH F-19. The trip resulted from actuation of a field over-current relay. Redundancy was maintained by the remaining diesel generator and two physically indepen-dent off-site circuits. Designation of Apparent Cuase: The apparent cause of this event was that the setpoint of a field over-current relay was out of tolerance. The pick-up voltage was found to be below the design setpoint. Analysis of Occurrence: There was no effect upon the general public health or safety. Corrective Action: The relay was adjusted to the proper pick-up voltage. EDG-1B field over-current relay setpoint has been verified. A surveillance progran is under development for implementation within six months. The program will include periodic examination of the field over-current relay. Failure Data: This is the first event of this type and the nineteenth report under this specification.}}