ML20039B228

LER 81-023/03L-0:on 811110,during Cold shutdown,4 Channel a Main Steam Line High Flow Switches Found Inoperable.Caused by Heating of Switching Element Due to Relay Coil Failure, Initially Reported in LER 81-021.Elements Replaced

ML20039B228
Person / Time
Site:	Monticello
Issue date:	12/10/1981
From:	Hammer M NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20039B225	List: ML20039B224 ML20039B228
References
LER-81-023-03L-01, LER-81-23-3L-1, NUDOCS 8112220441
Download: ML20039B228 (1)

Text

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NRCPF ORM 356 U.S NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT

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' EVENT DESCRIPTION AND PROBABLE CONSEQUENCES O'o I-l 0 ( 2 l l DURING COLD SHUTDOWN, THE FOUR CHANNEL A MAIN STEAM LINE HIGH FLOW SWITCHES g g o l3; lWERE FOUND INOPERABLE. TWO SWITCHES WOULD NOT TRIP AND 'IVO SWITCHES HAD EXCESSIVE g IOj41]SETPOINT DRIFT. REPORTED PER T.S. 6.7.B.2. a. REDUNDANT SWITCHES WERE OPERABLE.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h I i l o I l FAILURE ATTRIBUTED TO HEATING OF SWITCHING ELDIENT CAUSED BY RELAY COIL FAILURE g i1 liIl REPORTED ON LER 81-021. RELAY FAILURE CAUSED EXCESSIVE CURRENT TO BE DRAWN l li12II THROUGH SWITCH. INSTRUMENT IS BARTON MODEL 278. SWITCHING ELEMENTS REPLACED IN g i i l 3 I l AFFECTED INSTRUMENTS. REDUNDANT INSTRUMENTS TESTED SATISFACTORILY. -l l

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