ML19269E595

LER 79-009/03L-0 on 790320:during Surveillance Test,Diesel Generator 1 Output Breaker Failed to Close Upon Actuation of Control Switch.Cause of Inoperable Breaker Unknown.Operators Reinstructed in Test Circuit & Surveillance Increased

ML19269E595
Person / Time
Site:	Beaver Valley
Issue date:	06/21/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19269E593	List: ML19269E592 ML19269E595 ML19269E601
References
LER-79-009-03L, LER-79-9-3L, NUDOCS 7906290333
Download: ML19269E595 (1)

Text

U. S. NUCLEAR REGULATORY COMMISSION NRC FORM 366 um LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l Ih (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI f oTT1 I P LICENSEE l A l BCOCE l V l S l 113 l@l 0 10 l-LICENSE l0l0 l 0 l 0 l 0 l- l025 l 016l@lLICENSE NUM86R 4 l1l1l1l1l@l TYPE Jo l

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7 8 60 61 COCK ET NUM8 ER EVENT OESCRIPTION AND PROSA8LE CONSEQUENCES h

,Ql At approximatelv 0230 hours0.00266 days <br />0.0639 hours <br />3.80291e-4 weeks <br />8.7515e-5 months <br /> during performance of a surveillance test, the No. 1 l o 3 [ Diesel Generator output breaker failed to close when the control switch was l ITTTl I actuated. The test circuit installed to monitor breaker control cit.uitry was I o s [ observed. but due to an incomplete understanding by the operator, not all of the 1 I

o is I status licht conditions were renorted. The diesel cenerator was declared oI7 [ inoperable at 0310 hours0.00359 days <br />0.0861 hours <br />5.125661e-4 weeks <br />1.17955e-4 months <br />. The surveillance test was successfully completed at l l

0 d l 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br />. 80

a9 COMP. VALVE SYSTEM CAUSE CAUSE CODE COOE SUSCODE COMPONENT CODE SUSCODE SUSCODE o(9 lE l El@ l Xl@ y@

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3 8 9 11 SECUENTIAL CCCURRENCE REPORT REVISION

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EVENT YE AR REPCRT NO. CCOE TYPE No.

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43 44 47 CAUS: CESCRIPTION AND CORRECTIVE ACTIONS ieo l The cause of the inoperable breaker is unknown. The breaker test panel remains [

,ii l installed to conitor the breaker closing contacts. The operators have received I

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, gl more detailed instructions in the use and interpretation of the test circuit. All I

,,3 l contacts in the control circuit were inspected ,ad en diesel generator l i .i i surveillance test freauency has been increased to weekiv. [

80 7 8 9 ST %PCwtR OTHER STATUS 015 O RY OISCOVERV OESCRiPTION N/A lBl@l Surveillance test l i is l Cl@ l 0 l 0 l 0l@l l ACT'vtTV CO TENT aELEASEo Os atLEASE LOCATICN OF RELEASE t is l2 @ d@l AucuNT N/A Or ActiviTv 44 l

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7 8 9 10 11 PERSONNEL EXPCSURES NUMBER TYPE OESCRIPTION -

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t it l0l0l0l@l 8 9 11 12 N/A 80 l

LOSS OF CR OAM AGE TO FACILITY Q' TYPE D E SCRtPTION  %./

ii2 l21@liO N/A I P d 9 30

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6o ,$Sutfhl IN 0ESCRiPTiO~@

N/A 7906300 333 1 lll11IIIfIIf l:2 F 4 ) to 68 69 30. I

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• PHONE:

412-643-1258 NAME CF PAEPARER

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