ML19031B059

LER 1977-028-01 for Salem Unit 1 Loss of Transmission Line Due to Protective Relay Operation

ML19031B059
Person / Time
Site:	Salem
Issue date:	05/13/1977
From:	Schneider F Public Service Electric & Gas Co
To:	O'Reilly J NRC/IE, NRC Region 1
References
LER 1977-028-01
Download: ML19031B059 (4)

Text

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Frederick W. Schneider Public Service Electric and Gas Company 80 Park Place Newark. N.J. 07101 201 /622-7000 Vice President Production May 13, 1977 Mr. 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. O'Reilly:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORT.ll..BLE OCCURRENCE 77-28/03L 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 77-28/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours,

/

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

Director, Office of Management Information and Program Control (3 copies) 771470253

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.. e e Report Number.: 28/03L.

RepGrt Date: 5/2/77 Occurrence Date~ 4/18/77 Facility Salem Generating Station Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Loss of New.Freedom South 5024, 500kV Transmission Line.

CONDITIONS PRIOR Tb OCCURRENCE:

Mode 1, 55% Reactor Power DESCRIPTION OF OCCURRENCE; At 1550 hours0.0179 days <br />0.431 hours <br />0.00256 weeks <br />5.89775e-4 months <br />, the_ 2-6 and the 5-6, SOOkV Bus Tie Breakers opened on protective relay actuation. This caused a loss of the 5024 500kV transmission line. This event did not cause a reduction in Reactor power or generator load because the 1-5 breaker stayed closed keeping the- 5023 line energized. Technical Specification Action Statement (a) for LCO 3.8.1.1 was implemented and surveillance 4.8.1.1.1.a was com-pleted satisfactorily. The 5024 line was checked by helicopter and at 1633 hours0.0189 days <br />0.454 hours <br />0.0027 weeks <br />6.213565e-4 months <br />, re-energized. At 1634, the 2-6-breaker was reclosed and at 1635, the 5-6 breaker was closed. At this time, the 5024 was determined_ to be operable. and the action statement terminated *.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

A forest fire between towers 36/l and. 37/1 (36 miles from station) caused arcing from an-insulator to ground. This arcing caused pro-tective relays to actuate isolating the 5024 line at the station and at New Freedom switching station.

ANALYSIS OF OCCURRENCE:

Action Statement *(a) for LCO 3. 8 .1.1 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 off-site circuit. The 5024 line was inoperable for 45 minutes, therefore, the LCO was not violated. Surveillance 4.8.1.1.1.a was completed satisfactorily but 4. 8. L 1. 2. a. 2 was not accomplished because the 5024 line was. returned to service and the Action Statement terminated. At no time was there any danger to the health and safety of the general. public or site personnel.

Report No. 77;..2a/03L9 5/2/77 CORRECTIVE ACTION:

Investigation revealed that protective. relay actuation at the New Freedom switching station and at the station had isolated the trans-mission line. The line was checked by helicopter and no ground fault could be found. Protective relays were reset and the line returned to service.

FAILURE DATA:

Not Applicable Prepared by __~__T__

• ~*-L_.__S_p_e_n_c_e

__ r~

Manager - Salem

, Generating Station SORC Meeting No. 48-77

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~ER 77-32/03L 95/2/77 r LICENSEE EVENT REPORT CONTROL BLOCK 6

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Rl!:PORT REPORT CATEGOAV TYl"tt. SCURC£ COCKE7 NUMBER EVENT CATE Aa>oATCATE

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EVENT CE.SCRIPTlON

@:Ell During Mode 1 operation, protective relay operation caused *the loss of I 7 8 9 ao

@BJ the 5024, 500kV transmission line. 5023 remained in service through out 7 8

@El this event .. Line was checked by helicopter, protective relays reset and 7 8

([I!] ( 5024 was returned to service. This is the first occurrence of this type. I 1 a9 ao

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7. 8* 9. 10 11 12 17 43 -44 47 *48 CAUS1! CESC~IPTlON

~I Smoke from a forest fire 36-37 miles from the station caused arcing to I

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