ML17266A091: Difference between revisions

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{{#Wiki_filter:NRCPORM~ITTTILlCEblSEBEVENTREPORTU5HUCISARRSCU~TORYCOhcAIISSIONIIIlQI(PI.EAS19AINTORTYP8ALLRKCUIRSDINPORMATIONI~OIFlLISLSlli20Ol-0OlOlOl0-00)(4ll111QAL;CSN54TY>S70$1~7u,CCICSNu4C004I~Q.LICSNSS3lVAASSA7C~~O7"~ICD50003352J~II'72tl79Q~II5Itll79Q40~IOOOCST95IUAISSA$449SVSNTOATSIA7$AS>OIITOATS$08VSNTOSSCRIPTIONANOfRO8ASI.8CONSSOUS5VCSS~10Ouringpowerreduction,thevariablehighpowertripsetpointonchannel"C"inthecoreprotectioncalculatorfailedtotrackreactorpower.~03ActioninaccordancewithTechnicalSpecification3.3.1.1wasinitiated.A;05voltpowersupplywasrepairedandthechannelrestoredtooperableconditionwithinthetime'limitsecified.Therewasnoadverseaffect'n'heplant.Threechannelsremainedoperableandnoadditionalaction~09wasrequired.Thiswasthefirstoccurrenceofthistype.~081$0SYSTSIACAUSSCAV54CCAI@.vAUv4COOSCOOSSV5COOSCCAI>ONSNTCOOSSVSMOSfVSCOOStJ023S'~J>LaJDJ~9JIJO227>7910II1113151910SSOVSNTIAVOCCVAASNCSAS>OATASVISIONI>SINOSV4N'TYSAAAS>OATNO"COOSTY>4~NO,Q>>.4~AT~7~~~I~~~~~~L~~01111tA14'7101111ACTION>VTVASSf>SCDSNUTOOWN'LXISDTJS"D~JOLIJ9J0'0"'037"03JO"DJ315"~VIELLLD-4',lsCAUS8OSSCRIPTIONANOCORRKCfIV6ACTIONS~Thevariablehighpowertripsetpointdidnottrackthepowerlevelreduc-tionduetoafailedpowersupplyinthecoreprotectioncalculator.Theowersuo1failedbecauseofafailedfiltercapacitor.Thecauseof.thecapacitorfailureisnotknown.Themostprobablecauseisnormalendoflifeofanelectroniccomponent.9fACIU~f,XTATVS'\7OINSA07$14ilSTATUSQ~s~Q~L005~tQ)9NA7410,I'111ACTIVITYCONTSNTIISlSA540OfA4lSA54~ANOVNTOPACTIVITYQ)S~18~ZQ))~ZQ)$NAI5910lA>SII50NNSI.47I>OSVIISS.7~030Q33~lQTDNA5II1111>fi15ONNSIINIVRI453~050QDD"NANA1CCATIONOfRSI,SA54Q)84ISTIICO0>OISCOVSBY015COVSAYOSSCBI>TICN32~AQl0eratorObservation3073.9111110550>Cll0*MACS.0fAOUTYQ+3~I9~fQA274110>VSI.ICTYI55040045CPI>T:ON~LNIQ<4'I47'.0'A7318OPPRSPARcRNANAM.A.Schoppman7908300tt)1030NRCUScONIY(305)552-3802}}
{{#Wiki_filter:NRCPORM~ITTTILlCEblSEB EVENTREPORTU5HUCISARRSCU~TORY COhcAIISSION IIIlQI(PI.EAS19AINTORTYP8ALLRKCUIRSDINPORMATIONI
~OIFlLISLSlli20Ol-0OlOlOl0-00)(4ll111QAL;CSN54TY>S70$1~7u,CCICSNu4C004I~Q.LICSNSS3lVAASSA7C~~O7"~ICD50003352J~II'72tl79Q~II5Itll79Q40~IOOOCST95IUAISSA
$449SVSNTOATS IA7$AS>OIITOATS
$08VSNTOSSCRIPTION ANOfRO8ASI.8CONSSOUS5VCSS
~10Ouringpowerreduction, thevariablehighpowertripsetpointonchannel"C"inthecoreprotection calculator failedtotrackreactorpower.~03Actioninaccordance withTechnical Specification 3.3.1.1wasinitiated.
A;05voltpowersupplywasrepairedandthechannelrestoredtooperablecondition withinthetime'limitsecified.Therewasnoadverseaffect'n'heplant.Threechannelsremainedoperableandnoadditional action~09wasrequired.
Thiswasthefirstoccurrence ofthistype.~081$0SYSTSIACAUSSCAV54CCAI@.vAUv4COOSCOOSSV5COOSCCAI>ONSNTCOOSSVSMOSfVSCOOStJ023S'~J>
LaJDJ~9JIJO227>7910II1113151910SSOVSNTIAV OCCVAASNCS AS>OATASVISIONI>SINOSV4N'TYSAA AS>OATNO"COOSTY>4~NO,Q>>.4~AT~7~~~I~~~~~~L~~01111tA14'7101111ACTION>VTVASSf>SCDSNUTOOWN'LXISDTJS "D~JOLIJ9J0'0"'037"03JO"DJ315"~VIELLLD-4',ls CAUS8OSSCRIPTION ANOCORRKCfIV6 ACTIONS~Thevariablehighpowertripsetpointdidnottrackthepowerlevelreduc-tionduetoafailedpowersupplyinthecoreprotection calculator.
Theowersuo1failedbecauseofafailedfiltercapacitor.
Thecauseof.thecapacitor failureisnotknown.Themostprobablecauseisnormalendoflifeofanelectronic component.
9fACIU~f,XTATVS'\7OINSA07$14ilSTATUSQ~s~Q~L005~tQ)9 NA7410,I'111ACTIVITYCONTSNTIISlSA540OfA4lSA54~ANOVNTOPACTIVITYQ)S~18~ZQ))~ZQ)$NAI5910lA>SII50NNSI.
47I>OSVIISS
.7~030Q33~lQTDNA5II1111>fi15ONNSI INIVRI453~050QDD"NANA1CCATIONOfRSI,SA54Q)84ISTIICO0>OISCOVSBY 015COVSAY OSSCBI>TICN 32~AQl0eratorObservation 3073.9111110550>Cll0*MACS.0fAOUTYQ+3~I9~fQA274110>VSI.ICTY I55040045CPI>T:ON
~LNIQ<4'I47'.0'A7318 OPPRSPARcRNANAM.A.Schoppman 7908300tt)1030NRCUScONIY(305)552-3802}}

Revision as of 12:29, 29 June 2018

LER 79-025/03L-0 on 790720:variable High Power Trip Setpoint in Core Protection Calculator Failed to Track Reactor Power. Caused by Power Supply in Core Protection Calculator Failing Due to Filter Capacitor Failure
ML17266A091
Person / Time
Site: Saint Lucie NextEra Energy icon.png
Issue date: 08/17/1979
From: SCHOPPMAN M A
FLORIDA POWER & LIGHT CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17207A322 List:
References
LER-79-025-03L, LER-79-25-3L, NUDOCS 7908300711
Download: ML17266A091 (1)


Text

NRCPORM~ITTTILlCEblSEB EVENTREPORTU5HUCISARRSCU~TORY COhcAIISSION IIIlQI(PI.EAS19AINTORTYP8ALLRKCUIRSDINPORMATIONI

~OIFlLISLSlli20Ol-0OlOlOl0-00)(4ll111QAL;CSN54TY>S70$1~7u,CCICSNu4C004I~Q.LICSNSS3lVAASSA7C~~O7"~ICD50003352J~II'72tl79Q~II5Itll79Q40~IOOOCST95IUAISSA

$449SVSNTOATS IA7$AS>OIITOATS

$08VSNTOSSCRIPTION ANOfRO8ASI.8CONSSOUS5VCSS

~10Ouringpowerreduction, thevariablehighpowertripsetpointonchannel"C"inthecoreprotection calculator failedtotrackreactorpower.~03Actioninaccordance withTechnical Specification 3.3.1.1wasinitiated.

A;05voltpowersupplywasrepairedandthechannelrestoredtooperablecondition withinthetime'limitsecified.Therewasnoadverseaffect'n'heplant.Threechannelsremainedoperableandnoadditional action~09wasrequired.

Thiswasthefirstoccurrence ofthistype.~081$0SYSTSIACAUSSCAV54CCAI@.vAUv4COOSCOOSSV5COOSCCAI>ONSNTCOOSSVSMOSfVSCOOStJ023S'~J>

LaJDJ~9JIJO227>7910II1113151910SSOVSNTIAV OCCVAASNCS AS>OATASVISIONI>SINOSV4N'TYSAA AS>OATNO"COOSTY>4~NO,Q>>.4~AT~7~~~I~~~~~~L~~01111tA14'7101111ACTION>VTVASSf>SCDSNUTOOWN'LXISDTJS "D~JOLIJ9J0'0"'037"03JO"DJ315"~VIELLLD-4',ls CAUS8OSSCRIPTION ANOCORRKCfIV6 ACTIONS~Thevariablehighpowertripsetpointdidnottrackthepowerlevelreduc-tionduetoafailedpowersupplyinthecoreprotection calculator.

Theowersuo1failedbecauseofafailedfiltercapacitor.

Thecauseof.thecapacitor failureisnotknown.Themostprobablecauseisnormalendoflifeofanelectronic component.

9fACIU~f,XTATVS'\7OINSA07$14ilSTATUSQ~s~Q~L005~tQ)9 NA7410,I'111ACTIVITYCONTSNTIISlSA540OfA4lSA54~ANOVNTOPACTIVITYQ)S~18~ZQ))~ZQ)$NAI5910lA>SII50NNSI.

47I>OSVIISS

.7~030Q33~lQTDNA5II1111>fi15ONNSI INIVRI453~050QDD"NANA1CCATIONOfRSI,SA54Q)84ISTIICO0>OISCOVSBY 015COVSAY OSSCBI>TICN 32~AQl0eratorObservation 3073.9111110550>Cll0*MACS.0fAOUTYQ+3~I9~fQA274110>VSI.ICTY I55040045CPI>T:ON

~LNIQ<4'I47'.0'A7318 OPPRSPARcRNANAM.A.Schoppman 7908300tt)1030NRCUScONIY(305)552-3802