ML17266A091: Difference between revisions

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{{#Wiki_filter:NRC PORM~IT TT I LlCEblSEB EV ENT REPORT U 5 HUCI SAR RSCU~TORY COhcAIISSION I I I lQI (PI.EAS1 9 AINT OR TYP8 ALL RKCUI RSD INPORMATIONI
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~10Ouringpowerreduction, thevariablehighpowertripsetpointonchannel"C"inthecoreprotection calculator failedtotrackreactorpower.~03Actioninaccordance withTechnical Specification 3.3.1.1wasinitiated.
~10 Ouring power reduction, the variable high power trip setpoint on channel"C" in the core protection calculator failed to track reactor power.~03 Action in accordance with Technical Specification 3.3.1.1 was initiated.
A;05voltpowersupplywasrepairedandthechannelrestoredtooperablecondition withinthetime'limitsecified.Therewasnoadverseaffect'n'heplant.Threechannelsremainedoperableandnoadditional action~09wasrequired.
A;0 5 volt power supply was repaired and the channel restored to operable condition within the time'limit s ecified.There was no adverse affect'n'he plant.Three channels remained operable and no additional action~09 was required.This was the first occurrence of this type.~08 1$0 SYSTSIA CAUSS CAV54 CCAI@.vAUv4 COOS COOS SV5COOS CCAI>ON SNT COOS SVSMOS fVSCOOS tJ023S'~J>
Thiswasthefirstoccurrence ofthistype.~081$0SYSTSIACAUSSCAV54CCAI@.vAUv4COOSCOOSSV5COOSCCAI>ONSNTCOOSSVSMOSfVSCOOStJ023S'~J>
LaJDJ~9J I JO 227>7 9 10 I I 11 13 15 19 10 SSOVSNTIAV OCCVAASNCS AS>OAT ASVISION I>SINO SV4N'TYSAA AS>OAT NO" COOS TY>4~NO, Q>>.4~AT~7~~~I~~~~~~L~~0 11 11 tA 14'7 10 11 11 ACTION>VTVAS Sf>SCD SNUTOOWN'LXISDTJS"D~JO LIJ9J 0'0"'037"03JO"DJ315"~VIE LLLD-4',ls CAUS8 OSSCRIPTION ANO CORRKCfIV6 ACTIONS~The variable high power trip setpoint did not track the power level reduc-tion due to a failed power supply in the core protection calculator.
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.
The ower suo 1 failed because of a failed filter capacitor.
Theowersuo1failedbecauseofafailedfiltercapacitor.
The cause of.the capacitor failure is not known.The most probable cause is normal end of life of an electronic component.
Thecauseof.thecapacitor failureisnotknown.Themostprobablecauseisnormalendoflifeofanelectronic component.
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Revision as of 13:29, 7 July 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)
v • d • e


Text

NRC PORM~IT TT I LlCEblSEB EV ENT REPORT U 5 HUCI SAR RSCU~TORY COhcAIISSION I I I lQI (PI.EAS1 9 AINT OR TYP8 ALL RKCUI RSD INPORMATIONI

~OI Fl LIS L S ll i 2 0 Ol-0 Ol Ol Ol 0-0 0)(4ll 1 1 1 QA L;CSN54 TY>S 70$1~7 u ,C CICSNu4 C004 I~Q.LICSNSS 3lVAASSA 7 C~~O 7"~ICD 50 0 03 352J~II'7 2tl 7 9Q~II5 Itll7 9Q 40~I OOOCST95IUAISSA

$4 49 SVSNTOATS IA 7$AS>OIITOATS

$0 8VSNT OSSCRIPTION ANO f RO8ASI.8 CONSSOUS5VCSS

~10 Ouring power reduction, the variable high power trip setpoint on channel"C" in the core protection calculator failed to track reactor power.~03 Action in accordance with Technical Specification 3.3.1.1 was initiated.

A;0 5 volt power supply was repaired and the channel restored to operable condition within the time'limit s ecified.There was no adverse affect'n'he plant.Three channels remained operable and no additional action~09 was required.This was the first occurrence of this type.~08 1$0 SYSTSIA CAUSS CAV54 CCAI@.vAUv4 COOS COOS SV5COOS CCAI>ON SNT COOS SVSMOS fVSCOOS tJ023S'~J>

LaJDJ~9J I JO 227>7 9 10 I I 11 13 15 19 10 SSOVSNTIAV OCCVAASNCS AS>OAT ASVISION I>SINO SV4N'TYSAA AS>OAT NO" COOS TY>4~NO, Q>>.4~AT~7~~~I~~~~~~L~~0 11 11 tA 14'7 10 11 11 ACTION>VTVAS Sf>SCD SNUTOOWN'LXISDTJS"D~JO LIJ9J 0'0"'037"03JO"DJ315"~VIE LLLD-4',ls CAUS8 OSSCRIPTION ANO CORRKCfIV6 ACTIONS~The variable high power trip setpoint did not track the power level reduc-tion due to a failed power supply in the core protection calculator.

The ower suo 1 failed because of a failed filter capacitor.

The cause of.the capacitor failure is not known.The most probable cause is normal end of life of an electronic component.

9 f ACIU~f, XTATVS'\7OINSA 07$14il STATUS Q~s~Q~L005~tQ)9 NA 7 4 10, I'1 11 ACTIVITY CON TSNT II SlSA540 Of A 4l SA54~ANOVNT OP ACTIVITY Q)S~18~Z Q))~ZQ)$NA I 5 9 10 lA>SII50NNSI.

47I>OSVIISS

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~LN IQ<4'I 4 7'.0'A7318 OP PRSPAR cR NA NA M.A.Schoppman 7908300 t t)10 30 NRC USc ONI Y (305)552-3802

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