05000272/LER-1979-072, Forwards LER 79-072/03L-0

Forwards LER 79-072/03L-0

ML18081A732
Person / Time
Site:	Salem
Issue date:	12/03/1979
From:	Librizzi F Public Service Enterprise Group
To:	Grier B 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
NUDOCS 7912110296
Download: ML18081A732 (2)

LER-1979-072, Forwards LER 79-072/03L-0

Event date:
Report date:
2721979072R00 - NRC Website

text

Public Service Electric and Gas Company 80 Park Place Newark. N.J. 07101 Phone 201 1430-7000 Mr. Boyce H. Grier Director of USNRC December 3, 1979 Off ice of Inspection and Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 79-72/03L Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifications, Section 6.9.1, we are submitting Licensee Event Report for Reportable Occurrence 79-72/03L.

This report is required within thirty (30) days of the occurrence.

Sincerely yours, f0° !ir:41, F. P. L1~:fzz1 General Manager -

Electric Production CC:

Director, Office of Inspection and Enforcement (30 copies)

Director, Office of Management Information and Program Control (3 copies)

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Report Number:

Report Date:

Occurrence Date:

79-*03L 12/3/79 11/05/79 Facility:

Salem Generating Station Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Loss of Meteorological Instruments CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 5 DESCRIPTION OF OCCURRENCE:

At 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br />, the control room operator noted that the meteorolog-cal instrumentation in the control room had failed.

An Equipment Operator sent to the instrument house to investigate reported that the power supply inverter had failed.

The Maintenance Department was notified and the Action Statement for Technical Specification 3.3.3.4 was implemented.

Normal power was restored to the instru-ments by 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br /> on November 8, 1979, and the Action Statement was terminated.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this occurrence was a cooling fan in the power supply inverter which failed due to seized motor bearings.

The resultant overload severely damaged the inverter and the normal emergency power supply switching circuit which is housed in the inverter cabinet.

ANALYSIS OF OCCURRENCE:

The meteorological monitoring instrumentation channels are required by Technical Specification 3.3.3.4 to be operable at all times.

During the 74 hours8.564815e-4 days <br />0.0206 hours <br />1.223545e-4 weeks <br />2.8157e-5 months <br /> that the instruments were inoperable, the plant was maintained in steady state cold shutdown conditions and no radioactive releases were made to the atmosphere.

CORRECTIVE ACTION

Normal AC supply to the instruments has been restored and each channel was tested to verify operability.

The.emergency supply inverter will be replaced when a new inverter is available.

FAILURE DATA:

Not Applicable Prepared By A. W. Kapple Manager -/Salem Generating Station SORC Meeting No.

90-79