ML19294B007

LER 80-005/03L-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

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: ML19294B003 ML19294B007
References
LER-80-005-03L, LER-80-5-3L, NUDOCS 8002260577
Download: ML19294B007 (2)

Text

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

LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) l 6 jo l t l l Ml Nl Pl Il Nl 1l@l 0 l 0 l - l 0 l 0 l 0 l 0 l 0 l -l 0l Olh 4 l 1 8 9 26 1l1 1l@l$7 C Al T $8l@

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,g,,,  ; engine was being prelubed. D1 was inoperable about 8 minutes. Not repetitive. g i

101511 No effect on public health or safety. l 0 6 l l 0 7 l l 0 8 I l DE CODE SUSC E COMPONENT CODE SU8 CODE SU E 7

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[_YJ el 42 Nl@ l43 Al@ 44 F 0l1 l0 l@ 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1 O I Abnormally cold diesel cenerator room. See attached cause descriotion and l

, ,  ; corrective actions. ,

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3_1 I i LL14_j l l 7 8 9 80 ST S  % POWER OTHERSTATUS is O RY OlSCOVERY DESCRIPTION y y@ l 1l 0l 0l@l NA l { @l Surveillance Test ACTivlTY CO TENT RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE

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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.