05000272/LER-1979-072-03, /03L-0:on 791105,during Cold Shutdown Operation, Meteorological Instruments Were Out of Svc.Caused by Power Supply Inverter Failure Due to Cooling Fan Motor Being Bound,Overloading & Damaging Inverter.Normal Power Restored

/03L-0:on 791105,during Cold Shutdown Operation, Meteorological Instruments Were Out of Svc.Caused by Power Supply Inverter Failure Due to Cooling Fan Motor Being Bound,Overloading & Damaging Inverter.Normal Power Restored

ML18081A734
Person / Time
Site:	Salem
Issue date:	12/03/1979
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18081A733	List: 05000272/LER-1979-072, Forwards LER 79-072/03L-0 05000272/LER-1979-072-03, /03L-0:on 791105,during Cold Shutdown Operation, Meteorological Instruments Were Out of Svc.Caused by Power Supply Inverter Failure Due to Cooling Fan Motor Being Bound,Overloading & Damaging Inverter.Normal Power Restored
References
LER-79-072-03L, LER-79-72-3L, NUDOCS 7912110298
Download: ML18081A734 (1)

LER-1979-072, /03L-0:on 791105,during Cold Shutdown Operation, Meteorological Instruments Were Out of Svc.Caused by Power Supply Inverter Failure Due to Cooling Fan Motor Being Bound,Overloading & Damaging Inverter.Normal Power Restored

Event date:
Report date:
2721979072R03 - NRC Website

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I During cold shutdown operation, the meteorological instruments were out of service. I

((ill I Investigation showed the power supply inverter had failed.

Maintenanc.e Department was notified and T/S 3.3.3.4 Action Statement was implemented.

The instruments were out for 74 hours8.564815e-4 days <br />0.0206 hours <br />1.223545e-4 weeks <br />2.8157e-5 months <br /> before power was restored and the Action Statement was terminated.

The plant was maintained in steady state cold shutdown conditions with!

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44 47 [II)) I A cooling fan motor for the inverter bound and overloaded the inverter and damaged IIIIJ associated components of the inverter, including the normal emergency power switching circuit.

Normal power was restored and the inverter will be replaced IJ))] I when a new inverter is available.

Circuit tests verified instrument operability.

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