05000237/LER-1979-032-03, /03L-0 on 790501:intermediate Range Monitors in Trip Sys Found Downscale During Rod Pulls to Heating Power, Resulting in Manual half-scram.Caused by Faulty Connector & Loose Input Connector

/03L-0 on 790501:intermediate Range Monitors in Trip Sys Found Downscale During Rod Pulls to Heating Power, Resulting in Manual half-scram.Caused by Faulty Connector & Loose Input Connector

ML19269D586
Person / Time
Site:	Dresden
Issue date:	05/30/1979
From:	Holland P COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A893	List: 05000237/LER-1979-032, Forwards LER 79-032/03L-0 05000237/LER-1979-032-03, /03L-0 on 790501:intermediate Range Monitors in Trip Sys Found Downscale During Rod Pulls to Heating Power, Resulting in Manual half-scram.Caused by Faulty Connector & Loose Input Connector
References
LER-79-032-03L, LER-79-32-3L, NUDOCS 7906050248
Download: ML19269D586 (1)

LER-1979-032, /03L-0 on 790501:intermediate Range Monitors in Trip Sys Found Downscale During Rod Pulls to Heating Power, Resulting in Manual half-scram.Caused by Faulty Connector & Loose Input Connector

Event date:
Report date:
2371979032R03 - NRC Website

text

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0J G1 DOCK E T T= U'.*d E R 03 09 EVENT DATE 14 75 REPOR f DATE 8J EVENT DESCRIPTION AND PROB ABLE CO'JSEQUENCES h E i IRI's 17 and 18 in the "A" trip system were found downscale during rod pulls to heat-

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g ling power. Since T.S. Table 3.1.1 requires three operable instrument channels per j

g l trip system, operator immediately initiated a manual half-scram. Event had minimal l

g l safety significance since remaining two channels in the "A" trip system were operable. ;

g l No effect on public health or safety.

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IMi 18 had a loose input I

g ; preamp connector.

It was tightened and the downxcale alarm cleared. This was the l -

g l first occurence of this type on Unit 2.

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