ML19031B060

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

ML19031B060
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: ML19031B060 (4)

Text

I 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 OSNRC 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 REPORTABLE 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) 771.410012

1-*

~eport Number:

e 77-28/03L Report 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 TO 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, 500kV 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 36/1 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 4.8.1.1.2.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 persorin_el ..

. . :.. -~ "Report No. 77-28/03L e 5/2/77 CORRECTIVE ACTION:

Investigation revealed that protective relay actuation at the New Freedom switching station and at the station had isolated th& 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. Spencer

~~~~~~__...~~~~

Manager SORC Meeting No. 48-77

~~~~~~~~-

I.

LER 77-32/03L 65/2/77 LICENSEE EVENT REPORT ._,

CONTROL BLO<::K 6

UCENSEE LICENSE EVENT NAME LICENSE NUMBER TYP£ TYPE REPORT REPORT CATEGORY TYllE SOURCE COCKET NUMBER EVENT DATE REPORT DATE

~CON"T~; !OJ I~! l~I ~p I 51 0 I -I 0 I 2 I 71 2J 1014*1118 17 17 I 69 74 10 75 15 I 0 I2 17 flJ EVENT DESCRIPTION

@fill During Mode 1 operation, protective relay operation caused *the loss of I 7 8 9 so

@]!I the 5024, 500kV transmission line. 5023 remained in service through out 7 8 (2E] 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 7 8 9 so

{fil!)l~--~~~~~~~~~~....,......~~~~~~~~~~<~7_7_-2_8_/_0_3L~)~-='t*

7 8 9 PRIME SO SYSTEM CAUSE COMPONENT COMPONENT

. CODE CODE COMPONENT COCE SUPPLIER MANUFACTURER VIOLATION

@rr]tE !Al l.QJ !Z IZ 1z 1z (Z.-!LJ ~ IZ 19 19 I 91 lliJ 7 8 9 10 11 12 17 . 43 44 . 47 48 CAUSE DESCRIPTION

~I Smoke from a forest fire 36-37 miles from the station caused arcing to I coo 1 a~g--"""'"'_..,....._

9 ___________________________________________________________________so eo~

[@]":-~--~~--_;....------------~----------------------------------~--~

7 89 so FACJ;..;TY * . MET"4000F r.r.1 STATUS ~POWER OTHE-A STATUS DISCOVERY OISCOVERY DESCRIPTION L!J.!J. L..ru . 1o151*5 r I NIA I @J N/A 1 a 9 10 12 13 4'4 45 46 so

~ORM OF ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE l!fila 1

lE..J 9

lEJ 10 I

11 N/A I 4'4 45 N/A so PERSONNEL EXPOSURES r.J:l NUMBER TYPE CESC:RIPTION

~1010101 l],J ~I~~~N~/~A~----~---~~~--~~-.-~~~~-=!J 7 8 9 11 12 13 so PERSONNEL INJURIES NUMBER DESCRIPTION GE)aI90 I 0 I O11I I'='=12-------------"""'-~----------------------------------------------ao"""

1 N/A I OFFSITE CONSEQUENCES

µJ!ll§ . . N/A LOSS OR DAMAGE TO FACILITY TY~ DESCRIPTION UJ!l 1Z I 7 8~

I

~10....-----------------..=.i;..;:.;:...-

N/A ___________________________________________ J

--.....i~

PU81.ICITY GJ!]~--------------------"-s+-..1-:::........--------------------~----~--~---~-----'

7 8 9 ADDITIONAL FACTORS ITl!J.,._~~----~~~----N~/~A.;;.._______________________~~----~~~--"""

7 8 9 NAME: __________.T...-..,;.. * ....,...;;;L;;;....;...*-"'S.....P_e;;;.;n--.c-e;..;;r.__________ PMONE: ( 6 0 9 ) 3-6-S- 7 0 0 0 Ext. s alem-52