05000317/LER-1981-045-03, /03L-0:on 810601,channel a Power Range Instrument Was Found Faulty.Caused by Loose Upper sub-channel Cable Connector,Amphenol 31-4374,due to Normal Use.Connector Remade & Tightened

/03L-0:on 810601,channel a Power Range Instrument Was Found Faulty.Caused by Loose Upper sub-channel Cable Connector,Amphenol 31-4374,due to Normal Use.Connector Remade & Tightened

ML20009A556
Person / Time
Site:	Calvert Cliffs
Issue date:	07/01/1981
From:	Lagiewski J, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20009A552	List: 05000317/LER-1981-045, Forwards LER 81-045/03L-0 05000317/LER-1981-045-03, /03L-0:on 810601,channel a Power Range Instrument Was Found Faulty.Caused by Loose Upper sub-channel Cable Connector,Amphenol 31-4374,due to Normal Use.Connector Remade & Tightened
References
LER-81-045-03L, LER-81-45-3L, NUDOCS 8107130309
Download: ML20009A556 (1)

LER-1981-045, /03L-0:on 810601,channel a Power Range Instrument Was Found Faulty.Caused by Loose Upper sub-channel Cable Connector,Amphenol 31-4374,due to Normal Use.Connector Remade & Tightened

Event date:
Report date:
3171981045R03 - NRC Website

text

NRC FORM 366

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LICENSEE EVENT REPORT

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60 61 DOCKET NUMBER 68 69 EVENT DATE 14 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h IOI2l l At 1210, during normal startuo coeration. it was found that Channel "A" l

10131 1 power range instrument was faulty. Channel "A" trio units for HiPower.

l l 0 l41 1 Thermal Margin / Low Pressure and Axial Shape Index were bvoassed for I

iO Isi I troubleshooting (T.S. 3.3.1.1).

A cable connector was repaired and all I

10 is I 1 Channel "A"

trip units were returned to service at 1415. The three re-l l 0 l 71 I dundant channels remained coerable during this event. LER 77-18 de-1 i O is l l scribes a similar occurrence.

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h IiiO I l The upper sub-channel cable connector ( Amohenol #31-4374) at the Channel I

ii li j i "A" drawer was loose allowing the cable to slip, and center conductor I

li l 21 I contact to be lost. Detector current was regained after remaking and l

liIail tightening the connector. T,he failure is from nomal use, the connector I

l i t 41 l being routinely handled for tests. No oreventive action is necessary, 1

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