05000282/LER-1980-005-03, /03L-0:on 800121,during Surveillance Test of D1 Diesel Generator,Lockout Occurred While Engine Was Being Prelubed.Caused by Abnormally Cold Generator Room.Caution Will Be Added to Procedure to Monitor Lube Oil Pressure

/03L-0:on 800121,during Surveillance Test of D1 Diesel Generator,Lockout Occurred While Engine Was Being Prelubed.Caused by Abnormally Cold Generator Room.Caution Will Be Added to Procedure to Monitor Lube Oil Pressure

ML19294B007
Person / Time
Site:	Prairie Island
Issue date:	02/20/1980
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19294B004	List: 05000282/LER-1980-005, Forwards LER 80-005/03L-0 05000282/LER-1980-005-03, /03L-0:on 800121,during Surveillance Test of D1 Diesel Generator,Lockout Occurred While Engine Was Being Prelubed.Caused by Abnormally Cold Generator Room.Caution Will Be Added to Procedure to Monitor Lube Oil Pressure
References
LER-80-005-03L, LER-80-5-3L, NUDOCS 8002260577
Download: ML19294B007 (2)

LER-1980-005, /03L-0:on 800121,during Surveillance Test of D1 Diesel Generator,Lockout Occurred While Engine Was Being Prelubed.Caused by Abnormally Cold Generator Room.Caution Will Be Added to Procedure to Monitor Lube Oil Pressure

Event date:
Report date:
2821980005R03 - NRC Website

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NPC FORM 366 U.E. NUCLEAR REGULATORY COMMISSION (7 77)

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Northern States Power Company Prairie Island Nuclear Generating Plant - Unit No. 1 Attachment R0-80-5 Unit No. I was at full power and Unit No. 2 was shut down for refueling. Just prior to starting the engine for its biweekly surveillance, the engine is pre-lubed for 2 minutes. Normally this produces a lube oil pressure of about 0.5 paig.

Since D2 Diesel Generator had been running continuously as a result of R0 79-32, the D1 Diesel Generator Room was abnormally cool; ventilation air supply is shared. Lube oil pressure under these conditions reached 6 psig and shutdown circuitry saw this as an aborted start attempt and actuated the shutdown relay and the 86 lockout.

A caution will be added to the procedure to monitor lube oil pressure. Prelube is not done for an automatic start, so except for the 8 minutes of inoperability the unit would have started automatically as required. D2 is no longer running continuously and the system is in a normal configuration.