ML19031B056

LER 1977-037-01 for Salem Unit 1 Transmission Line Trip Due to Protective Relay Actuation

ML19031B056
Person / Time
Site:	Salem
Issue date:	06/02/1977
From:	Librizzi F Public Service Electric & Gas Co
To:	O'Reilly J NRC/IE, NRC Region 1
References
LER 1977-037-01
Download: ML19031B056 (4)

Text

...

p Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /622-7000 June 2, 1977 Mr. James P. O'Reilly Director of USNRC Office 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 77-37/03L 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 77-37/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours,

. JwV\_.,,_

Frank P. Libr~~

General Manager -

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

Director, Office of Management Information and Program Control (3 copies) 771590.2'17 The Energy People 95-2001 (400M) 6-75

Report Number:

Report Date:

77-37/03L 5/18/77 Occurrence Date: 5/14/77 Facility Salem Generating Station Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Loss of Off Site Power Source (5023, 500kV Transmission Line)

CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 1, Reactor Power 90%

DESCRIPTION OF OCCURRENCE:

At 1444 hours0.0167 days <br />0.401 hours <br />0.00239 weeks <br />5.49442e-4 months <br />, the 5023, 500kV transmission line tripped on protective relay actuation. The Shift Supervisor implemented Technical Specifica-tion Action Statement 3.8.1.1.a. Surveillance Test 4.8.1.1.1.a and 4.8.1.1.2.a.2 were performed with satisfactory results. The 5023 line was patrall.ed by helicopter and at 1640 hours0.019 days <br />0.456 hours <br />0.00271 weeks <br />6.2402e-4 months <br />, was re-energized.

Action Statement 3.8.1.1.a was then terminated.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

A forest fire between towers 36/1 and 36/3 (36 miles from station) caused arcing to ground which actuated the protective relays. The line was isolated at the New Freedom switching station, as well as the Salem switchyard.

ANALYSIS OF OCCURRENCE:

Technical Specification 3.8.1.1.2 allows 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to restore an inoper-able off site transmission line, provided that the operability of the remaining AC power sources is demonstrated. Surveillance 4.8.1.1.1.a and 4.8.1.1.2.a.2 were performed with satisfactory results and the 5023 line was returned to service within the time allowed, therefore, the limiting condition for operation was not violated. At no time was there any danger to the health and safety of the general public or site personnel.

e

,, Report No. 77-37/03L 5/18/77

~

CORRECTIVE ACTION:

Personnel from the Transmission and Distribution Department patrolled the 5023 line by helicopter. Protective relays were reset and the line re-energized.

FAILURE DATA:

Not Applicable Prepared by ______T__

L_.__S~p_e_n_c_e_r___

Manager - SaL(/m Generating Station SORC Meeting No. ____~5_4_-~7~7~-----

5/18/77

... LICENSEE EVENT REPORT

-~'

CONTAOI. BLOCK 6

L.ICl!:NSEE 1..ICENSE EVENT NAME l..ICENSE NUMBER TVPE TVPE REPORT REPORT CATEGORV TV,.E SOURCE OOCl<ET NUMBER EVENT CATE REPORT CATE

~ coN"T~~ I OJ ~ I ~I ~p I 51 0 I -I 0 I 2 I 7 l 2J 1015\11417171 69 74 1015111817 75

!7J EVENT CESC:RtPTlON

@:@JI. During* Mode 1 operation, the 5023, 500kV transmission line tripped due to I 1 a g so 7

([Ell protective relay actuation._ The 5024 line and three diesel generators 8 9 J-

@El were operable throughout this event. 5023 was patroled by helicopter and 7 8

@:Ifill re-energized. This is the second occurrence of this type (ref. 77-28/031). I 1 ag _ 60

~I This event 77-37/031. 1-1 a9 PRIME 80 SYSTEM CAUSE COMPONENT COMPONENT COOE CCOE COMPONENT COOE SUP91..IER MANUFACTURER \1101..ATION

@mtEIAI ~ Ix I x I X IX I X.JXj l]J I ZI 9 19 19 I lliJ 1 a9 10 11 12 17 43 44 47 48 CAUSc CESCAIPTION

~l A forest fire between towers 36/1 and 36/3 caused arcing to ground actuating 9 StJ 1

@:Ifilla g the protective relays, tripping the line.

so I

7IT:@]s~g~~~---~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~--'so FACIL.ITV METHOO OF STATUS ~POWER OTHER STATUS OISCOVERV orscove:;:w CESCRIPT10N

[ill}

7 a w.

9 IO I 91 O!

10 12 l~_..N....,/~A_ _....,.....I 1:3 44 laJ 45 NIA so FORM OF ACTl\llTV CONTENT REL.EA.SEO OF REL.EASE AMOUNT OF ACTIVITY 1..0CATION OF REL.EASE Gli] lru ~ I N/A I '~------N~/_A__________,I 1 a 9 10 11 *44 45 ao PERSONNEL EXPOSURES NUMBER TVPE CESCRIPTION Gli)tOIO!Ol 1 a9 11 tz,J 12 I N/A 1~J,__~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~s:o~

j PERSONNEL INJURIES NUMBER CESCRIPTION 12Elto10101 N A 7 8 9 11 l:Z N/A AOCITIONAL. FACTORS

[I!].,..______________________,..______________________________~--~--------_.,..,

7 89 00 (609) 365-7000 Ext.Salem.:

J NAME: _ _ _ _T_._L_._S"""p__;;;e,;;,n=-c=-e=r------- PHONE: