ML19225C202

LER 79-023/03L-0 on 790621:diesel Tripped Repeatedly on Low Lube Oil Pressure During Test.Caused by Isolation of Engine Oil Pressure Switch Following 790620 Preventive Maint Calibr.Preventive Maint Procedure Changed

ML19225C202
Person / Time
Site:	Calvert Cliffs
Issue date:	07/20/1979
From:	Davis S, Miernicki M BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19225C199	List: ML19225C198 ML19225C202
References
LER-79-023-03L, LER-79-23-3L, NUDOCS 7907260663
Download: ML19225C202 (2)

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LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIREO INFORMATION)

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REPORT D ATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 i At 0610 while perfomino an operational test of 21 diesel generator orior to o 3 removing one off site power source from service, the diesel tripped repeatedly l

o , l on low lui;e oil pressure (T.S.3.8.1.1) . A subsequent investication revealed d

a 3  ; that the isolation valve for the lube oil pressure sw tch was isolated. The j gs l valve was opened and the diesel tested satisfactory. All offsite power sources and I oi,  ; r-dundent diesel generators remained operable during the event. This is not a i o,g i repetitive occurrence. l 0E CO E S C E COMPONENT CODE SUB DE ?U E o 9 l E jpg D j@ lZ [@ l Ij Nl Sj Tl Rl Uj@ l5 @ g@

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LER NO. 79-23/3L DOCKET NO. 50-318 ~

EVENT DATE 6-21-79 REPORT-DATE 7-20-79 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

The engine oil pressure switch (0-PS-4795) was erroneously left isolated following the conduct of a preventive maintenance calibration on 6/20/79.

T:lis isolation also isolated other lube oil pressure switches that disabled the diesel starting circuit. The procedur was deficient in that there was no step to ensure the instrument was returned to :ervice with the isolation valves in the proper lineup. PM's that put equipment out of service are followed by an operational test before the equipment is declared back in service. The PM on the engine oil pressure switch was not recognized as putting the other pressure switches, and thus the diesel out of service, so no operational test of the diesel was conducted following the PM.

The PM procedure has been changed to include ~ the engine oil pressure switch as a PM that places the diesei out of service. In addition, all instrument, electrical and mechanical PM's, functional test procedures and maintenance procedures have been reviewed for, and changes made to include steps, where needed, to return equipments to service following the maintenance action.

T raining sessions have been conducted to ensure technicians recognize the f.eed for verifying that equipments are returned to service in the proper line-up following a maintenance action.

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