ML19031B165

LER 1978-035-03 for Salem Unit 1 Loss of Power to No. 2 Station Power Transformer

ML19031B165
Person / Time
Site:	Salem
Issue date:	07/20/1978
From:	Librizzi F Public Service Electric & Gas Co
To:	Grier B NRC/IE, NRC Region 1
References
LER 1978-035-03
Download: ML19031B165 (4)

Text

PS~G Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201/622-7000 July 20, 1978

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Mr. Boyce H. Grier r,*-,c-j Director of USNRC

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Off ice of Inspections and Enforcements c- ::;i.;

Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

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Dear Mr. Grier:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 78-35/03L Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifications, Section 6.9.1.9.b, we are submitting Licensee Event Report for Reportable Occurrence 78-35/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours,

), .

F.

~b' P. Li rizzi General Manager -

Electric Production CC: Director, Office of Inspection -

and Enforcement (30 copies)

Director, Office of Management Information and Program Control

( 3 copies)

Report Number: *8-35/03L Report Date: 7/20/78 Occurrence Date: 6/30/7"8 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 1 - Reactor Power 90%

DESCRIPTION OF OCCURRENCE:

At 1453 hours0.0168 days <br />0.404 hours <br />0.0024 weeks <br />5.528665e-4 months <br />, the Gas Turbine was being placed in service when the control operator noticed that there was no electrical output from this unit. The operator stopped the gas turbine. When the gas turbine 13k.V output breaker opened, the 13kV Bus Section 4-5 breaker also opened causing a loss of power to No. 2 Stat,\on Power Transformer. Vital buses swapped over to No. 1 Station Power Transformer. Action Statement 3.8.1.1.a was implemented. At 1716 hours0.0199 days <br />0.477 hours <br />0.00284 weeks <br />6.52938e-4 months <br />, power was restored to No. 2 Station Power Trans;former and applicable Action Statements were terminated.

• DESIGNATION OF APPARENT CAUSE .OF OCCURRENCE:

The cause of this occurrence was operator error. The 13kV Gas Turbine output breaker was found to be in the test position rather than fully racked in. Opening of this breaker in this condition caused relay operation resulting in opening of the 13kV Bus Section 4-5 Breaker and loss of power _to the No. 2 Station Power Transform.er.

ANALYSIS OF OCCURRENCE:

Technical Specification 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 returned to operable status within 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />, therefore, the Technical Specifications were not violated.

CORRECTIVE ACTION:

Following the loss of power to No. 2 Station Power Transformer, maititenance p~rsonnel found the 13kV Gas Turbine output breaker in the.

test position. *Investigation showed no equipment damage and power was restored to No. 2 Station Power Transformer.

To prevent reoccurrence of .this type of event, the responsible op~rator was reinstructed on the proper method of breaker operation.

LER 78-35/03L FAILURE DATA:

N/A Prepared by T. L. Spencer

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SORC Meeting No. 46-78

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U.S. NUCLEAR REGULATURY COMMISSION NRC FORM 366 (7-77)

-LICENSEE EVENT REPORT CONTROL BLOCK: I 1!---'-~..._.......~-----.!6.

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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• 101 o I oI - I o I o I oI o I o *1 - I o I o IG)I 4 I 1 I 1 I 1 I 1 I©I I I© 7 8 9 l.JCENSEE COOE 14 15 . l.ICENSE NUMBER . 25 26 l.ICENSE TYPE ;JO 57 CAT sa CON'T filIJ8 7

~~~~~~ LJJ© I o I s I oI o I o I 2 I 7 I 2 1(2)1 o I 6 I 3 I o I 7 I a I© I a I 60 61 . DOCKET NUMBER 6S 69 EVENT CATE 74 75 1 I2 I REPORT CATE aI1 I e I© 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES@

I While starting the gas turbine relay operation caused a loss of

[]JI] .power to No. 2 Station Power Transformer. No. 1 SPT operable through-

!Im out this event. This is the second occurrertce of this type.

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32 ACTION FUTURE EFFECT SHUTDOWN ~ ATTACHMENT NPR0-4 PRIME COMP. COMPONENT TAKEN ACTION ON Pl.ANT METHOD HOURS ~ SUBMITTED FORM SUB. SUPPLJER *MANUFACTURER W@lJiJ@

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44 47 CAUSE DESCRIPTION ANO CORAECilVE ACTIONS@

r:II[J I The cause of this event was personnel error. The operator failed to fully rack in the 13kV GT output breaker when preparing the unit for CIJ]J l service. Power was restored to No. 2 SPT. Responsible operator reinstructed on proper breaker operation.

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7 FACILITY /3Q\ METHOD OF (.;::;\

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NAMF OF*P9FPA9F9 T. L. SJ9encer .. PHONE* {609)365-7000 Salen Ext.~