ML19208D511

LER 79-033/03L-0:on 790824,nuclear Instrumentation Sys Power Range Low Power Trip Logic Inoperable.Caused by Faulty Logic Board for Low Power Trip.Logic Board Replaced & Surveillance Test Completed Satisfactorily

ML19208D511
Person / Time
Site:	Beaver Valley
Issue date:	09/21/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19208D503	List: ML19208D502 ML19208D508 ML19208D511 ML19208D513
References
LER-79-033-03L, LER-79-33-3L, NUDOCS 7909280510
Download: ML19208D511 (1)

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EVENT DESCRIPTION AND PRODABLE CONSEQUENCES h 10121 [.During oct'formance of surveillance testing on the Train B SSpS, it was discovered the l lnl3ll NTS power range 10w- power trip logic was inoperabic. The Train A SSPS logic remained l 0 4 l operabic throughout thL period. There were minimal safety implications as no credit l O s l is taken in the SAR for the low power trip. l 10161 L I O 7 l (, a l j

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47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h lil0llThe incident resulted from a faulty logic board for the low power trip. The logic i i l board was replaced and the surveillance test was completed satisfactorilv. I l i 171 l 11131 I l i - l l 7 8 3 80 ST S  % POWE R OTHER$TATUS 15COV HY DISCOVERY DESCRIPT.ON Ii I 5 l dh l 0 l 6 l 8 l@l N/A l l B l@l Surveillance test l ACTivlTY CO TENT A(LE ASE D OF FtE LE ASF AMOUNT OF ACTavlTY LOCATION OF RE LE ASE i 6 Lz_.] @ toLzJ@l N/A I I N/A I i 8 9 11 44 45 80 FEnSONNEL E XPOSURES NU'.8B E R TYPE DESCRIPTION i i 10l0101@lzl@l"

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