05000315/LER-1979-023-03, /03L-0 on 790326:portion of Circuitry for Rod K-10 Indication Was Shorted Rendering Channel Inoperable.Caused by Shorting Secondary Coil Voltage Terminals to Line Voltage Terminals at Rear of Indicator Panel.Measurement Revi

/03L-0 on 790326:portion of Circuitry for Rod K-10 Indication Was Shorted Rendering Channel Inoperable.Caused by Shorting Secondary Coil Voltage Terminals to Line Voltage Terminals at Rear of Indicator Panel.Measurement Revised

ML17317B138
Person / Time
Site:	Cook
Issue date:	04/24/1979
From:	Beilman T INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317B132	List: 05000315/LER-1979-023-03, /03L-0 on 790326:portion of Circuitry for Rod K-10 Indication Was Shorted Rendering Channel Inoperable.Caused by Shorting Secondary Coil Voltage Terminals to Line Voltage Terminals at Rear of Indicator Panel.Measurement Revi 05000315/LER-1979-024-03, /03L-0 on 790326:indicated Position for Rod F-6 Exceeded Twelve Step Limit Imposed by Tech Specs, & Problem Recurred Four More Times in Two Days.Investigation in Progress & Suppl Rept Will Be Submitted ML17317B131
References
LER-79-023-03L, LER-79-23-3L, NUDOCS 7904300303
Download: ML17317B138 (2)

LER-1979-023, /03L-0 on 790326:portion of Circuitry for Rod K-10 Indication Was Shorted Rendering Channel Inoperable.Caused by Shorting Secondary Coil Voltage Terminals to Line Voltage Terminals at Rear of Indicator Panel.Measurement Revised

Event date:
Report date:
3151979023R03 - NRC Website

text

U. S. NUCLEAR REGULATORY COMMISSION NRC FORM 366 L[CENSEE EVENT REPORT

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8 SOURCE 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES ~10 WHILE TROUBLESHOOTING A PROBLEM ON XJ ADJACENT ROD POSITION INDICATION CIRCUIT

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~06 A PORTION OF THE CIRCUITRY FOR ROD K-10 INDICATION WAS INADVERTANTLY SHORTED RENDERING THE CHANNEL INOPERABLE.

ROD K-]0 INDICATION WAS RESTORED TO OPERABLE STATUS WITHIN THE TIME LIMIT SPECIFIED BY T.S. 3.1.3.2.

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10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LF+RO EVENT XEAR REPORT NO.

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0 Qss 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS +27 THE EVENT WAS CAUSED BY SHORTINGVHE SECONDARY COIL VOLTAGE TERMINALS TO THE LINE'OLTAGE TERMINALS AT THE REAR OF THE INDICATOR PANEL.

TO PREVENT RECURRENCE, THE METHOD OF OBTAINING VOLTAGE MEASUREMENTS HAS BEEN REVISED.

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32 80 LOCATION OF RELEASE QS6 44 80 80 80 80 NRC USE ONLY

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