ML19312D049

LER 80-004/03L-0:on 800123,while Performing Routine Rod Block Monitor Surveillance,Channel B Flow Biased Rod Setpoints on Rod Block Monitor Found Out of Spec by Approx 11%.Caused by Diode Failure in Analog Circuit

ML19312D049
Person / Time
Site:	Peach Bottom
Issue date:	02/22/1980
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-80-004-03L, LER-80-4-3L, NUDOCS 8002290473
Download: ML19312D049 (1)

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IJ J This L.E.R. concoma malihnoti n of one channel of a 6i be)lduI u.[3 rod block monitor. The oveming Technical Specification is Section 3.2.0 and Table J 2.0 P. 73 and 24ote #1 for Table 3 2.C, whida requires two operable trip systems, cn. .w o entsu,.u..u t y .e. w s .

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TT~~I Ljdhile perfoming a mutine rod block monitor surveillance, the channel, i

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Ejj~j i The cause of this event was a diode (VRz-IMl47JhA).,failun,_,in,_the _ rod i E{T] l block _ monitor, analog, oircuit. The, failed diode.,was replaced,v,i.thig o_ne 6 y[ hour of the discovered failure. The unit was_ rete _e,ted satisfactorily and 1 8l re,,tumed to service. ,,_ _ , _ ,, _ , _ , _ _,,_ _ _ _ _]

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