ML18081A863

Forwards LER 77-046/03L-0

ML18081A863
Person / Time
Site:	Salem
Issue date:	07/19/1977
From:	Librizzi F Public Service Enterprise Group
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18081A856	List: ML18081A855 ML18081A857 ML18081A858 ML18081A859 ML18081A860 ML18081A861 ML18081A862 ML18081A863 ML18081A864 ML18081A865 ML18081A867
References
NUDOCS 8001080532
Download: ML18081A863 (3)

Text

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Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 2011622-7000 July 19, 1977 M.r. James P. O'Reilly Director of USNRC Off ice of Inspections and Enforcements Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. 0 1 Reilly:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 77-46/03L Pursuant to the reouj.reinents of Salem Generatinq Station Unit No. 1 Technical. Spicifi6ations, Section 6.9.1, we are submitting Licensee Event Report for Reportable Occurrence 77-46/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours, Original Signed I'. P. Libriz?.i F. P. Librizzi General Manager -

Electric Production CC: Director, Office of Inspection and Enforcement (30 copies)

Director, Office of ~anagement Information and Program Control (3 copies) 8001 08() 532 96*2001 :!DOM 10-*,

Report Number: 77-46/03L Report Date: 7/12/77

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Occurrence Date: 6/28/77 Facility: Salem Generating Station Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Loss of No. 2 Station Power Transformer (Interconnect between offsite transmission network and onsite Class lE)

CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 2, Reactor Power: 10- 8 amps DESCRIPTION OF OCCURRENCE:

At 1140 hours0.0132 days <br />0.317 hours <br />0.00188 weeks <br />4.3377e-4 months <br />, during testing of the 1-5, 500kV GCB, the 1- 5 breaker*

was closed in the test position. The 1-8, 500kV GCB opcnej as well as the 3-4 and 4-5, 13kV breakers. This action isolated the 500kV Bus Section No. 1 and the 13kV Bus Section No. 4. The F ane G gr0up busses were de-energized and 13 and 14 Reactor Coolant Pumps fed from the Yan~

G group busses were lost. Technical Specification 3.R.J.l.a was implP-mented and surveillance 4.8.1.1.1.a and 4.8.1.1.2.a.2 was co~oleted. *

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At 1320, the 500kV, 1-8 GCB and the 3-4 and 4-5, 13kV brer:J-:ers wsre n~-

closed to establish a normal electrical lineup. At 1324, Action State-ment 3.8.1.l was terminated.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this event was personnel error. During the testing of the Bus Section 1-5, 500kV breaker, the breaker f~ilure and ground protec-tion circuit was not tagged out of service. When the 1-5 breaker was closed in the test position, the protective relay ciicuit saw this as a "stuck breaker" and. is.elated the apparent fault.

ANALYSIS OF OCCURRENCE:

Technical S~ecification Action Statement 3.8.1.1.a allows 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to restore an inoperable offsite circuit to operable status. The No. 2 Station Power transformer was restored to operable status in 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and 44 minutes, therefore, the Technical Specifications were not violated.

This event did not cause any personal injury or equipment damage.

. , Report No. 77-46/03L e 7/12/77 CORRECTIVE ACTION:

The breaker failure and ground protection circuit was tagged out of service for the remainder of the breaker testing. The SOOkV, Bus Section 1-8 breaker and the 13kV, Bus Section 3-4 and 4-5 breakers were reclosed to restore the electrical distribution system to normal.

Although the SOOkV breakers are non-safety related, a detailed pro-cedure covering testing of switchyard components is being prepared and should be available by September 1, 1977.

FAILURE DATA:

Not Applicable.

Prepared by T. Spencer

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SORC Meeting No. 75-77

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