05000333/LER-1981-063-03, /03L-0:on 810805,IRM G Became Erratic W/Upscale Spikes Causing half-scrams.Caused by Loose Connector at Preamplifier Which Allowed Momentary Grounding.Connector Tightened

/03L-0:on 810805,IRM G Became Erratic W/Upscale Spikes Causing half-scrams.Caused by Loose Connector at Preamplifier Which Allowed Momentary Grounding.Connector Tightened

ML20010F783
Person / Time
Site:	FitzPatrick
Issue date:	09/02/1981
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
ML20010F779	List: 05000333/LER-1981-063, Forwards LER 81-063/03L-0 05000333/LER-1981-063-03, /03L-0:on 810805,IRM G Became Erratic W/Upscale Spikes Causing half-scrams.Caused by Loose Connector at Preamplifier Which Allowed Momentary Grounding.Connector Tightened
References
LER-81-063-03L, LER-81-63-3L, NUDOCS 8109110325
Download: ML20010F783 (1)

LER-1981-063, /03L-0:on 810805,IRM G Became Erratic W/Upscale Spikes Causing half-scrams.Caused by Loose Connector at Preamplifier Which Allowed Momentary Grounding.Connector Tightened

Event date:
Report date:
3331981063R03 - NRC Website

text

U. S. NUCLE AR REGULC '9Y COMMISSION NRC FORM 366 (778 LICENSEE EVEjMT REPORT CONTROL BLOCK: l l

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60 61 CCCK ET NuYS E R 68 69 EVENT C ATE 74 75 REPORT CATE 63 EVENT DESCOlPTION AND PRC8ABLE CONSEQUENCES h l o 12 I l During normal shutdown operations, IRM 'G' became erratic with upscale soikes I

lo13l l causing half-scrams.

IRM A (in the same Reactor Protection channel) was also 1

lo la l I inoperable. TS Table 3.1-1 required that Reactor Protection System ' A' be olaced I

4 t o i s I l in a tripped condi tion until IRM

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43 44 47 CAUSE CESCRIPTICN AND CORRECTIVE ACTIONS lijallThe cause of erratic operation was due to a : loose connector at the ore-amolifier l

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Followina tiahtenina of the connector _ IRM

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