05000333/LER-1979-070-03, /03L-0:on 790909,during Normal Operation,Improper Inputs Noted at a & C Levels to Rod Block Monitor A.Caused by Failed Integrated Circuit.Circuit Replaced,Instrument Recalibr & Returned to Svc

/03L-0:on 790909,during Normal Operation,Improper Inputs Noted at a & C Levels to Rod Block Monitor A.Caused by Failed Integrated Circuit.Circuit Replaced,Instrument Recalibr & Returned to Svc

ML19209B638
Person / Time
Site:	FitzPatrick
Issue date:	10/05/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19209B584	List: 05000333/LER-1979-070, Forwards LER 79-070/03L-0 05000333/LER-1979-070-03, /03L-0:on 790909,during Normal Operation,Improper Inputs Noted at a & C Levels to Rod Block Monitor A.Caused by Failed Integrated Circuit.Circuit Replaced,Instrument Recalibr & Returned to Svc
References
LER-79-070-03L, LER-79-70-3L, NUDOCS 7910100261
Download: ML19209B638 (2)

LER-1979-070, /03L-0:on 790909,during Normal Operation,Improper Inputs Noted at a & C Levels to Rod Block Monitor A.Caused by Failed Integrated Circuit.Circuit Replaced,Instrument Recalibr & Returned to Svc

Event date:
Report date:
3331979070R03 - NRC Website

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JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET N0 50-333 ATTACHMENT TO LER 79-070/03L-0 Page 1

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During normal operation, Operations personnel noted improper inputs at the "A" and "C" levels to Rod Block Monitor "A".

The instrument was declared in-operable and the redundant channel (Rod Block Monitor "B") was verified operable by completing Operations Surveillance Test F-ST-5R ti tled " Rod Block Moni tor Upscale and Downscale Instrument Functional Test" to satisfy the requi rements of Technical Speci fications Appendix A, Table 3.2-2.

Since the redundant instru-ment was fully operable the event did not represent any significant hazard to the public health and safety.

Investigation revealed a failed integrated circuit. The circuit was re-placed and the instrument was recalibrated to verify proper operation and returned to service.

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