05000316/LER-1979-047-03, /03L-0:on 791124,during Grid Degraded Voltage Relay Calibr,Relay 27-1-201-AB Dropped Out at Nonconservative Value.Caused by Zener Diode Failure.Diode Replaced & Relay Recalibr

/03L-0:on 791124,during Grid Degraded Voltage Relay Calibr,Relay 27-1-201-AB Dropped Out at Nonconservative Value.Caused by Zener Diode Failure.Diode Replaced & Relay Recalibr

ML17326A424
Person / Time
Site:	Cook
Issue date:	12/19/1979
From:	Rischling J INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17318A519	List: 05000316/LER-1979-046, Forwards LER 79-046/03L-0 & LER 79-047/03L-0 05000316/LER-1979-046-03, /03L-0:on 791119,during Refueling,Source Range Neutron Flux Monitor N-31 Failed.Caused by Excessive Moisture in Detector Wells.Detectors Replaced & Dried 05000316/LER-1979-047-03, /03L-0:on 791124,during Grid Degraded Voltage Relay Calibr,Relay 27-1-201-AB Dropped Out at Nonconservative Value.Caused by Zener Diode Failure.Diode Replaced & Relay Recalibr
References
LER-79-047-03L, LER-79-47-3L, NUDOCS 7912270602
Download: ML17326A424 (2)

LER-1979-047, /03L-0:on 791124,during Grid Degraded Voltage Relay Calibr,Relay 27-1-201-AB Dropped Out at Nonconservative Value.Caused by Zener Diode Failure.Diode Replaced & Relay Recalibr

Event date:
Report date:
3161979047R03 - NRC Website

text

U. S. NUCLEAR REGULATORY COMMISSION ICENSEE EVENT REPORT Q1 (PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION) 6 0

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABI.E CONSEQUENCES Q10 DURING THE CALIBRATION OF GRID DEGRADED VOLTAGE RELAYS RELAY NUMBER 27 1

201 AB DROPPED OUT AT A VA'LUE CORRESPOND ING TO 2 1. 9 KV.

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'kI 0" 33 34 35 36 37 40 41 i42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 INVESTIGATION REVEALED THAT A ZENER DIODE HAD FAILED IN THE AFFECTED RELAY MANUFACTURED BY GF-NGV13A11A.

THE ZENER DIODE WAS REPLACED AND THE RELAY WAS CALIBRATED TO THE PROPER SETPOINTS.

NO FURTHER ACTIONS ARE REQUIRED 3

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