ML20004C363

LER 81-006/03L-0:on 810414,during Normal Surveillance Testing of Scram Discharge Header Cms,Three of Four Channels Installed Failed.Caused by Component Failure.Marginal Crystals Used in Transmitter Replaced by Manufacturer

ML20004C363
Person / Time
Site:	Cooper
Issue date:	05/14/1981
From:	Doan P NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20004C361	List: ML20004C360 ML20004C363
References
IEB-80-17, LER-81-006-03L, LER-81-6-3L, NUDOCS 8106030258
Download: ML20004C363 (1)

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I EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h -

lOl2[ puring normal surveillance testing of the Scram Discharge Header CMS, three of the 'l fBTil ifour channels installed failed. Af ter repair, during a subsecuent scram. two chan- l 10141 hels failed to resnond oroneriv. Rack-un indiencinn of the acrn nn eha handar u4eh I f3Ts1 ho CMS response operated correctiv. Initial failure could have resulted in one l IOleI header havinst the ability to fill uithone nnernene knnul adga uhfeh enn1A hava nra- l l 0 l 71 krenepA n full nevnm_ 'T'h f a cuane nemennenA nn mAumven a nn am n,,an r o e fenm eke oesnA. _

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JJ J4 35 36 37 40 41 42 42 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h lil0i ; Initial occurrence was due to component failure. Marginal crystals were used in.the l L' LLJ ltransmitter. Crystals were replaced by manufacturer using a different suppliar. Air I m l test to prove header was empty commenced. Secondary failure was due to bonding in l L' LlJ leransducer. Transducer was redesiened eliminatine the number of bonds and improvine I l i 14 I lhnnding annyv. Togic una changed ameeing n1 mm nnine ne ?" l 7 8 3 so STA S * ,POWE R OTHER STATUS 015 0 RY DISCOVERY DESCRIPTION l i l 5 I d@ I O l 8 l j@l NA l l B l@l Technician Observation l ACTivtTY CO TENT 0 AMOUNT OF ACTIVITY LOCATION OF RELEASE i 6 lZ_,j

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