05000333/LER-1980-012-03, /03L-0:on 800111,during Surveillance Testing, Emergency Diesel Generator a Tripped on Low Lube Oil Pressure.Caused by Partial Failure of Engine Immersion Heater Resulting in Cold Lube Oil.Heater Replaced

/03L-0:on 800111,during Surveillance Testing, Emergency Diesel Generator a Tripped on Low Lube Oil Pressure.Caused by Partial Failure of Engine Immersion Heater Resulting in Cold Lube Oil.Heater Replaced

ML19262C614
Person / Time
Site:	FitzPatrick
Issue date:	02/09/1980
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19262C613	List: 05000333/LER-1980-012, Forwards LER 80-012/03L-0 05000333/LER-1980-012-03, /03L-0:on 800111,during Surveillance Testing, Emergency Diesel Generator a Tripped on Low Lube Oil Pressure.Caused by Partial Failure of Engine Immersion Heater Resulting in Cold Lube Oil.Heater Replaced
References
LER-80-012-03L, LER-80-12-3L, NUDOCS 8002140712
Download: ML19262C614 (2)

LER-1980-012, /03L-0:on 800111,during Surveillance Testing, Emergency Diesel Generator a Tripped on Low Lube Oil Pressure.Caused by Partial Failure of Engine Immersion Heater Resulting in Cold Lube Oil.Heater Replaced

Event date:
Report date:
3331980012R03 - NRC Website

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,l During surveillance testing EDG A tripped on low lube oil pressure.

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POWER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACHMENT TO LER 80-012/03L-0 Page 1 of 1 During normal operation, while conducting Operations Surveillance Test F-ST-9B titled "EDG Full Load Test (ISI)", Emergency Diesel Generator A tripped on low lube oil pressure during the attempted start of the engine. The redundant emergency diesei generators were verified operable, the emergency power system associated with the failed emergency diesel generator was connected to the off-site power sources and both off-site power sources were verified available as required by Technical Specification Paragraph 3.9.B.3.

Under automatic emergency starting conditions, the emergency diesel generator would have started and operated normally because the low lube oil pressure trip is blocked. The event did not represent a significant hazard to the public health and safety.

Investigation revealed that the low lube oil pressure trip was caused due to the failure of one phase of the emergency diesel engine immersion heater. This heater failure resulted in low lubricating oil temperatures.

Consequently, the engine's lube oil system could not deliver normal lube oil pressure within the 15 second time period allowed by the engine control circuitry during start of the engine.

Following replacement of the failed immersion heater, satisfactory operation of the emergency diesel generator was demonstrated by successful completion of F-ST-9B, two (2) days after discovery of the problem.

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