ML19269D586

LER 79-032/03L-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

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: ML17173A892 ML19269D586
References
LER-79-032-03L, LER-79-32-3L, NUDOCS 7906050248
Download: ML19269D586 (1)

Text

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REPOR f DATE EVENT DESCRIPTION AND PROB ABLE CO'JSEQUENCES h Ei IRI's 17 and 18 in the "A" trip system were found downscale during rod pulls to heat- [

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. l El I Ei 60 i

SY ST E *.i CAUSE CAUSE - CCYP. VALVE COCE CODE SUSCOCE COVPONENT CODE SUBCCDE SUSCODE

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33 36 3a 31 40 41 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIC'45 h j r. l l 1Di 17 failed because of a faulty connector, due to aooarent minor damage durine re- I g l fueling. Connector was replaced and tested satisfactorily. 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. IRI's will continue to-be tested monthly l g using surveillance DIS 700-4 )

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