ML19031B559

LER 1977-046-03 for Salem Unit 1 Inoperability of No. 2 Station Power Transformer Due to Protective Relay Operation

ML19031B559
Person / Time
Site:	Salem
Issue date:	07/19/1977
From:	Librizzi F Public Service Electric & Gas Co
To:	O'Reilly J NRC/IE, NRC Region 1
References
LER 1977-046-03
Download: ML19031B559 (5)

Text

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PubliG Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201/622-7000

• July 19, 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 REPORTABLE OCCURRENCE 77-46/03L 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 77-46/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours,

)yz,L/~

F. P. Librizzi General Manager -

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

Director, Office of Management Information and Program Control (3 copies) 77207001:::: 1 The Energy People 95*2001 300M 10-

Report 'Number: 77-46/03L Report Date: 7/12/77 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 opened 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 and G group busses were de-energized and 13 and 14 Reactor Coolant Pumps fed from the Fans G group buss es were lost. Technical Specification 3. 8 .1. l. a was imple-mented and surveillance 4.8.1.1.1.a and 4.8.1.1.2.a.2 was completed.

At 1320, the 500kV, 1-8 GCB and the 3-4 and 4-5, 13kV breakers were re-closed to establish a normal electrical lineup. At 1324, Action State-ment 3.8.1.1 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 failure 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 circuit saw this as a "stuck breaker" and isolated the apparent fault.

ANALYSIS OF OCCURRENCE:

Technical Specification 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.

~- . \"'-A

' Report No. 77-46/03. 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 500kV, 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 500kV 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_.;.....__Sp=---e~n~c_e_r~--~

Station SORC Meeting No. _______7~5_-_7~7;.....____

CONTROL 8LOC1' LICENSEE EVENT REPORT I* I

• LER 77-46/03L 7/12/77 .

6 LICENSEE LICENSE EVENT NAME LICENSE NUMBER TVf"E TYPE

@EJIN1J1s1G1s111 9 14 10101-10101010101-101od 15 . 2 1411111 ll lJ 25 . ~ ~1 10 1~31 CATEGORVR~~~~T ~50~~I DOCKET NUMBER EVENT DATE REPORT DATE loTil CON'TI ri 57.

I .I 5a llJ 59 LLJ 60 I 0 I 51 0 I - I 0 I 21 71 21 61 68 I 0 16 12 16 17 I 7 I 69 74 I 017 11 12 17 75 L7J EVENT DESCRIPTION

@TI] !During Mode 2 operation, the No. 2 Station Power Transformer becamP. inoper-1 1 a's eo

@:ill able due to protective *relay o eration. Both offsite transmission lines 7 8 9

~ and the No. 1 SPT was operable throughout this event. The electrical lineulo 7 8 9

@liJ!was restored to normal'and action statement 3.8.1.1 was terminated. This I 1 a9 00

~lis the first event of tbjs type,* (77-lc6 /03I.) I 7 8 9 PRIME SYSTEM . CAUSE COMPONENT COMPONENT

• CODE CODE COMPONENT CODE SUPPLIER MANUFACTURER VIOLATION

@EJIEIAI lAJ IT IR IA IN IS--1.EJ lLJ lw 11 I 2 Io I lNJ 1 as 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION

~l;ersonnel error in not tagging the Breaker Failure and Ground Protection J

@:Jfil!circuit out of service duriug breaker testjng caused this event. I 7 89 00 1~0~9~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~----00

'F'ACILITV METHOD CF STATUS  % POWEi'! OTHE1BSTATUS DISCOVERY DISCOVERY PF.SCRIPTION 0TIa LEJ. Io Io Io I I Rx: 10- . amps I LaJ ~reaker Testirig in Progress 7 9 10 12. 1.J 44 45 45 so FORM OF ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY

[ili] ~ LEJ I N/ A 7 8 9 10 11 PERSONNEL EXPOSURES NUMBER TYPE OESCRIPTION 7

~1010101 8 9 11 LZJ12

'=-~~--=N~A-=---~~~~~~~~~~~~~~~~~~~

13 80 PERSONNEL INJURIES NUMBER DESCRIPTION GB1010101 NA 7 8 9 11 l:Z 80 OFFSITE CONSEQUENCES t1is!',.,----~~----~~~-N.:..:..c..-=Ac:.-~~-~~--~-~~~~~~-~~-~~~~->C(

LOSS OR DAMAGE TO FACILJTV TYP1;; 0£SCRIPTION ,

1

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PUBLICITY UEI..,_~~~~~~~~~~-.J..:t..,'-=~~~~~~~~~~~~~~~~~~~~~__.

7 8 9 BO ADDITIONAL FACTCRS

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' 8~ 00 NAME=--------=T::....:.'__;L;;;...;.'__;S::;..o..::;..;:e=-=n~c==---'"e=-=r"'------ PHONE: (609)365-7000 Ext. Salem 528 L

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