ML17228B368: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
(Created page by program invented by StriderTol)
Line 17: Line 17:


=Text=
=Text=
{{#Wiki_filter:LXAMAXEA(ACCELERATEDRIDSPROCESSIiCREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)CESSIONNBR:9512260055DOC.DATE:95/12/19NOTARIZED:NOFACIL:50-335St.LuciePlant,Unit1,FloridaPower&LightCo.50-389St.LuciePlant,Unit2,FloridaPower&LightCo.AUTH.NAMEAUTHORAFFILIATIONGOLDBERG,J.H.FloridaPower&LightCo.RECIP.NAMERECIPIENTAFFILIATIONDocumentControlBranch(DocumentControlDesk)SUBJECT:Respondstoviolationsnotedininsprepts50-335/95-2050-389/95-20.Correctiveactions:multidisciplineteamestablishedtoperformcomprehensivereviewofnuclearsafety-relatedreliefvalvelift&blowdownsettings.DISTRIEDTIONCODE:IEOIDCOPIESRECEIVED:LTRIENCLgSIZE:TITLE:General(50Dkt)-InspRept/NoticeofVioTationResponseNOTES:DOCKET0500033505000389RECIPIENTIDCODE/NAMEPD2-1PDINTERNAL:ACRSAEOD/SPD/RABDEDRONRR/DISP/PIPBNRR/DRPM/PECBNUDOCS-ABSTRACTOGC/HDS3EXTERNAL:LITCOBRYCE,JH'RCPDRCOPIESLTTRENCL11221111111111111111RECIPIENTIDCODE/NAMENORRIS,JAEOD/DEIBAEOTCLECERNCTP/HHFBNRR/DRPM/PERBOEDIRRGN2FILE01NOACCOPIESLTTRENCL111111111111111111VOTETOALL"RIDS"RECIPIEY'TS:PLEASEHELPUSTOREDUCEiVASTE!COYTACTTHEDOCL'ifEYTCOYTROLDESK.ROOMPl-37(EXT.504.2083)TOELIXIIiATE5'OI.'RiAiIEFROilDISTRIBUTIOYLISTSI'ORDOCI.'MEi'I'SYOUDOi"I'ELIDIOTALNUMBEROFCOPIESREQUIRED:LTTR20ENCL20  
{{#Wiki_filter:LXAMAXEA(ACCELERATED
RIDSPROCESSIiC
REGULATORY
INFORMATION
DISTRIBUTION
SYSTEM(RIDS)CESSIONNBR:9512260055
DOC.DATE:95/12/19NOTARIZED:
NOFACIL:50-335
St.LuciePlant,Unit1,FloridaPower&LightCo.50-389St.LuciePlant,Unit2,FloridaPower&LightCo.AUTH.NAMEAUTHORAFFILIATION
GOLDBERG,J.H.
FloridaPower&LightCo.RECIP.NAME
RECIPIENT
AFFILIATION
DocumentControlBranch(Document
ControlDesk)SUBJECT:Respondstoviolations
notedininsprepts50-335/95-20
50-389/95-20.Corrective
actions:multidiscipline
teamestablished
toperformcomprehensive
reviewofnuclearsafety-related
reliefvalvelift&blowdownsettings.
DISTRIEDTION
CODE:IEOIDCOPIESRECEIVED:LTR
IENCLgSIZE:TITLE:General(50Dkt)-InspRept/Notice
ofVioTation
ResponseNOTES:DOCKET0500033505000389RECIPIENT
IDCODE/NAME
PD2-1PDINTERNAL:
ACRSAEOD/SPD/RAB
DEDRONRR/DISP/PIPB
NRR/DRPM/PECB
NUDOCS-ABSTRACT
OGC/HDS3EXTERNAL:
LITCOBRYCE,JH'RCPDRCOPIESLTTRENCL11221111111111111111RECIPIENT
IDCODE/NAME
NORRIS,JAEOD/DEIB
AEOTCLECERNCTP/HHFBNRR/DRPM/PERB
OEDIRRGN2FILE01NOACCOPIESLTTRENCL111111111111111111VOTETOALL"RIDS"RECIPIEY'TS:PLEASEHELPUSTOREDUCEiVASTE!COYTACTTHE
DOCL'ifEYT
COYTROLDESK.ROOMPl-37(EXT.504.2083)TOELIXIIiATE5'OI.'RiAiIEFROilDISTRIBUTIOY
LISTSI'ORDOCI.'MEi'I'S
YOUDOi"I'ELIDIOTALNUMBEROFCOPIESREQUIRED:
LTTR20ENCL20  
   
   
FloridaPower5LightCompany,P.O.Box128,FortPierce,FL34954-0128FPLDEC191995L-95-33310CFR2.201U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.'.20555Re:St.LucieUnits1and2DocketNo.50-335and50-389ReplytoNoticeofViolationIninR-2-EA-222FloridaPowerandLightCompany(FPL)hasreviewedthesubject,noticeofviolationissuedonNovember28,1995.Pursuantto10CFR2.201,theresponseisattached.OnDecember1,1995,theNRCseniorresidentinspectorforSt.LucienotifiedFPLthattheresponsetothisnoticeofviolationwasnotrequiredtobesubmittedunderoathoraffirmationasoriginallyrequested'bythenoticeofviolation.Verytrulyyours,J.H.oldbergPresident-NuclearDivisionJHG/GRMAttachmentcc:StewartD.Ebneter,RegionalAdministrator,USNRCRegionIISeniorResidentInspector,USNRC,St.LuciePlantQf>P;~rVit~r9512260055951219PDRADDCK050003359PDRanFPLGroupcompany
FloridaPower5LightCompany,P.O.Box128,FortPierce,FL34954-0128
Re:St.LucieUnits1and2DocketNo.50-335and50-389ReplytoNoticeofViolationInsecinRe-20ViolationEA5-22210CFR50,AppendixB,CriterionXVI,"CorrectiveActions,"requires,inpart,thatmeasuresbeestablishedtoassurethatconditionsadversetoqualityarepromptlyidentifiedandcorrected.Contrarytotheabove,conditionsadversetoquality,involvingreliefvalvesetpointandblowdownvalues,identifiedonFebruary20,March2,andMarch10,1995,didnotreceivepromptcorrectiveactionsandledtoarepeatofpreviouslyidentifiedproblemsonAugust10,1995,whenUnit1reliefvalveV-3439liftedandfailedtoreseatwithoutoperatorintervention.Thesubjecteventresultedinapproximately4000gallonsofreactorcoolantaccumulatingintheUnit1pipetunnel.Evaluationsperformedafterthiseventrevealedtheneedtoreplace,orestablishnewsetpointsfor,severalreliefvalvesinsafetysystemsinbothunits.ThisisaSeverityLevelIVviolation(SupplementI).FPLRne1.Thereasonfortheviolation:Theseriesofreliefvalveeventsthatoccurredinearly1995tookplaceindifferentplantsystemsandinvolvedbothSt.LucieUnit1andUnit2.Initialplanteffortstocorrecttheseindividualplanteventswerefocusedonsolvingtheplantsystemcontrolproblemsthatledtothepressuretransientscausingtheseriesofreliefvalveactuation.Briefly,theseeventsarediscussedbelow:ThecausesoftheUnit1andUnit2letdownevents(betweenJanuary23,1995andJuly8,1995)wereassociatedwithletdownpressurecontrolproblems.Thecorrectiveactionswerefocusedontheletdownpressurecontrolvalveperformance.ThecauseoftheUnit2componentcoolingwaterreliefvalveactuationevent(February17,1995)wasatestconfigurationproblem.AtthetimeoftheNRCinspectionforthesubjectinspectionreport,asystemtransienttestwasbeingdevelopedtoevaluatetheconfigurationproblem.  
FPLDEC191995L-95-33310CFR2.201U.S.NuclearRegulatory
Commission
Attn:DocumentControlDeskWashington,
D.'.20555Re:St.LucieUnits1and2DocketNo.50-335and50-389ReplytoNoticeofViolation
IninR-2-EA-222FloridaPowerandLightCompany(FPL)hasreviewedthesubject,noticeofviolation
issuedonNovember28,1995.Pursuantto10CFR2.201,theresponseisattached.
OnDecember1,1995,theNRCseniorresidentinspector
forSt.LucienotifiedFPLthattheresponsetothisnoticeofviolation
wasnotrequiredtobesubmitted
underoathoraffirmation
asoriginally
requested
'bythenoticeofviolation.
Verytrulyyours,J.H.oldbergPresident
-NuclearDivisionJHG/GRMAttachment
cc:StewartD.Ebneter,RegionalAdministrator,
USNRCRegionIISeniorResidentInspector,
USNRC,St.LuciePlantQf>P;~rVit~r9512260055
951219PDRADDCK050003359PDRanFPLGroupcompany
Re:St.LucieUnits1and2DocketNo.50-335and50-389ReplytoNoticeofViolation
InsecinRe-20Violation
EA5-22210CFR50,AppendixB,Criterion
XVI,"Corrective
Actions,"
requires,
inpart,thatmeasuresbeestablished
toassurethatconditions
adversetoqualityarepromptlyidentified
andcorrected.
Contrarytotheabove,conditions
adversetoquality,involving
reliefvalvesetpointandblowdownvalues,identified
onFebruary20,March2,andMarch10,1995,didnotreceivepromptcorrective
actionsandledtoarepeatofpreviously
identified
problemsonAugust10,1995,whenUnit1reliefvalveV-3439liftedandfailedtoreseatwithoutoperatorintervention.
Thesubjecteventresultedinapproximately
4000gallonsofreactorcoolantaccumulating
intheUnit1pipetunnel.Evaluations
performed
afterthiseventrevealedtheneedtoreplace,orestablish
newsetpoints
for,severalreliefvalvesinsafetysystemsinbothunits.ThisisaSeverityLevelIVviolation
(Supplement
I).FPLRne1.Thereasonfortheviolation:
Theseriesofreliefvalveeventsthatoccurredinearly1995tookplaceindifferent
plantsystemsandinvolvedbothSt.LucieUnit1andUnit2.Initialplanteffortstocorrecttheseindividual
planteventswerefocusedonsolvingtheplantsystemcontrolproblemsthatledtothepressuretransients
causingtheseriesofreliefvalveactuation.
Briefly,theseeventsarediscussed
below:ThecausesoftheUnit1andUnit2letdownevents(betweenJanuary23,1995andJuly8,1995)wereassociated
withletdownpressurecontrolproblems.
Thecorrective
actionswerefocusedontheletdownpressurecontrolvalveperformance.
ThecauseoftheUnit2component
coolingwaterreliefvalveactuation
event(February
17,1995)wasatestconfiguration
problem.AtthetimeoftheNRCinspection
forthesubjectinspection
report,asystemtransient
testwasbeingdeveloped
toevaluatetheconfiguration
problem.  
l  
l  
ThecauseoftheUnit1shutdowncoolingsuctionreliefevent(February27,1995)wasaflowinitiatedpressuretransient.Thecorrectiveactionwastheimplementationofaprocedurechangewhichmitigatesthepotentialforpressuretransientswhileplacingshutdowncoolinginservice.Longtermcorrectiveactionsarediscussedinparagraph2.D.ThecauseoftheUnit1shutdowncoolingdischargerelief(V3439)event(August10,1995)wasidentifiedasadesignliftandblowdownsetpointproblem.Oncetherelieflifted,itdidnotreseatwithoutoperatorinterventiontoisolatetheaffectedportionofthesystem.ThecorrectiveactionsweretoreplacethevalveV3439andtoincreasethereliefvalveliftsetpointandtoreducetheblowdownsettingtherebyprovidingadditionaloperatingmargin.Theseindividualeventsdidnotappeartoshareacommonrootcauseandcorrectiveactionstoresolvetheseindividualproblemswerepromptlyinitiatedbyplantmanagement.AgenericreliefvalvesetpointconcernwasidentifiedbytheOperationsSupervisoronMarch2,1995(followingtheFebruary27,1995event),andwasassignedtoMechanicalMaintenanceforresolution.BetweenMarchandAugustof1995,Maintenancefocusedondevelopingthreecorrectiveactions:1)anewreliefvalvetestbench,2)revisionstovalvetestprocedures,and3)improvedmaintenancetraining.Maintenancehadnotconsideredadesignproblemwithreliefvalvesetpointsand,therefore,effortsweredirectedtowardverifyingthatthereliefvalvescouldbesetinaccordancewithplantdesign.Theunderlyingrootcausefortheseriesofreliefvalveevents-lackofdesignintegrationbetweensystemoperatingpressuresandreliefvalvereseatpressures-wasnotevidentuntiltheSt.LucieUnit1shutdowncoolingdischargereliefevent(August10,1995).Atthattime,theEngineeringDepartmentestablishedamulti-disciplinedteamtoinvestigatesafety-relatedreliefvalveliftandreseatsettings.TheSt.LucieActionRequest(STAR)processwasacontributingfactortothedelayinfindingtheunderlyingrootcauseoftheevents.TheSTARprocessreliedonseriesassignmentsforactionsanddidnotlenditselftoparallelinvestigationsorcorrectiveactions.Thecorrectivestepsthathaveorwillbetakenandtheresultsachieved:A.ThecorrectiveactionstakentoaddressthespecificproblemofsafetyrelatedreliefvalveliftandblowdownsettingsandcontrolofreliefvalvedesigninformationwereprovidedintheUnit1LicenseeEventReport(LED)95-06,andatthepre-decisionalenforcementconferenceonNovember14,1995.  
ThecauseoftheUnit1shutdowncoolingsuctionreliefevent(February
B.InAugust1995,amulti-disciplineteamwasestablishedtoperformacomprehensivereviewoftheSt.LucieUnit1andUnit2nuclearsafetyrelatedreliefvalveliftandblowdownsettings.TheteamwascomposedofpersonnelfromMaintenance,Operations,PlantSystemEcComponentEngineering,andNuclearEngineering.Atotalof114reliefvalveswerereviewed(53forUnit1and61forUnit2)andtheirdesignsettingswereevaluatedrelativetosystemoperatingandtransientpressures.Seventeenofthesevalvesrequiredadditionalanalysis.Correctiveactions,exceptasnotedin2.Dbelow,havebeentakentoincreasethemarginbetweensystemoperatingpressuresandthelift/reseatsetting,whereappropriate.C.Unit1reliefvalvemodifications,withtheexceptionoftheshutdowncoolingsuctionoverpressurereliefvalves,V3468andV3483,wereimplementedpriortotheOctober1995startup,followingtheshutdownrelatedtoHurricaneErin.D.Unit1shutdowncoolingsuctionoverpressurereliefvalves,V3468andV3483,liftsettingswereadjustedtoimprovetheliftmarginpriortotheOctober1995startup.Withtheserevisedliftsettings,shutdowncoolingcanbeinitiatedwithoutchallengingthesereliefvalves.TheliftandblowdownsettingswillbefurthermodifiedduringtheSpring1996refuelingoutage.E.Unit2reliefvalvemodificationswereimplementedduringtheFall1995refuelingoutage.3.Thecorrectivestepstakenorplannedtoavoidfurtherviolations:~A.FPLMaintenanceSpecificationSPEC-M-038,SafetyRelatedReliefValveSetpointsSt.LucieUnits1and2,wasissuedinNovember1995toinstitutionalizetheresultsofthereliefvalvedesignreviewteam.B.TheSTARprocesswasmodifiedtofacilitateparalleldepartmentassignmentsfortheevaluationandcorrectionofdeficiencies.4.Thedatewhenfullcompliancewillbeachieved:A.TheSTARprocessprocedurewasmodifiedinOctober1995.B.FullcomplianceforthereliefvalvesettingswillbeachievedduringtheSpring1996refuelingoutage.
27,1995)wasaflowinitiated
pressuretransient.
Thecorrective
actionwastheimplementation
ofaprocedure
changewhichmitigates
thepotential
forpressuretransients
whileplacingshutdowncoolinginservice.Longtermcorrective
actionsarediscussed
inparagraph
2.D.ThecauseoftheUnit1shutdowncoolingdischarge
relief(V3439)event(August10,1995)wasidentified
asadesignliftandblowdownsetpointproblem.Oncetherelieflifted,itdidnotreseatwithoutoperatorintervention
toisolatetheaffectedportionofthesystem.Thecorrective
actionsweretoreplacethevalveV3439andtoincreasethereliefvalveliftsetpointandtoreducetheblowdownsettingtherebyproviding
additional
operating
margin.Theseindividual
eventsdidnotappeartoshareacommonrootcauseandcorrective
actionstoresolvetheseindividual
problemswerepromptlyinitiated
byplantmanagement.
Agenericreliefvalvesetpointconcernwasidentified
bytheOperations
Supervisor
onMarch2,1995(following
theFebruary27,1995event),andwasassignedtoMechanical
Maintenance
forresolution.
BetweenMarchandAugustof1995,Maintenance
focusedondeveloping
threecorrective
actions:1)anewreliefvalvetestbench,2)revisions
tovalvetestprocedures,
and3)improvedmaintenance
training.
Maintenance
hadnotconsidered
adesignproblemwithreliefvalvesetpoints
and,therefore,
effortsweredirectedtowardverifying
thatthereliefvalvescouldbesetinaccordance
withplantdesign.Theunderlying
rootcausefortheseriesofreliefvalveevents-lackofdesignintegration
betweensystemoperating
pressures
andreliefvalvereseatpressures
-wasnotevidentuntiltheSt.LucieUnit1shutdowncoolingdischarge
reliefevent(August10,1995).Atthattime,theEngineering
Department
established
amulti-disciplined
teamtoinvestigate
safety-related
reliefvalveliftandreseatsettings.
TheSt.LucieActionRequest(STAR)processwasacontributing
factortothedelayinfindingtheunderlying
rootcauseoftheevents.TheSTARprocessreliedonseriesassignments
foractionsanddidnotlenditselftoparallelinvestigations
orcorrective
actions.Thecorrective
stepsthathaveorwillbetakenandtheresultsachieved:
A.Thecorrective
actionstakentoaddressthespecificproblemofsafetyrelatedreliefvalveliftandblowdownsettingsandcontrolofreliefvalvedesigninformation
wereprovidedintheUnit1LicenseeEventReport(LED)95-06,andatthepre-decisional
enforcement
conference
onNovember14,1995.  
B.InAugust1995,amulti-discipline
teamwasestablished
toperformacomprehensive
reviewoftheSt.LucieUnit1andUnit2nuclearsafetyrelatedreliefvalveliftandblowdownsettings.
Theteamwascomposedofpersonnel
fromMaintenance,
Operations,
PlantSystemEcComponent
Engineering,
andNuclearEngineering.
Atotalof114reliefvalveswerereviewed(53forUnit1and61forUnit2)andtheirdesignsettingswereevaluated
relativetosystemoperating
andtransient
pressures.
Seventeen
ofthesevalvesrequiredadditional
analysis.
Corrective
actions,exceptasnotedin2.Dbelow,havebeentakentoincreasethemarginbetweensystemoperating
pressures
andthelift/reseat
setting,whereappropriate.
C.Unit1reliefvalvemodifications,
withtheexception
oftheshutdowncoolingsuctionoverpressure
reliefvalves,V3468andV3483,wereimplemented
priortotheOctober1995startup,following
theshutdownrelatedtoHurricane
Erin.D.Unit1shutdowncoolingsuctionoverpressure
reliefvalves,V3468andV3483,liftsettingswereadjustedtoimprovetheliftmarginpriortotheOctober1995startup.Withtheserevisedliftsettings,
shutdowncoolingcanbeinitiated
withoutchallenging
thesereliefvalves.TheliftandblowdownsettingswillbefurthermodifiedduringtheSpring1996refueling
outage.E.Unit2reliefvalvemodifications
wereimplemented
duringtheFall1995refueling
outage.3.Thecorrective
stepstakenorplannedtoavoidfurtherviolations:
~A.FPLMaintenance
Specification
SPEC-M-038,
SafetyRelatedReliefValveSetpoints
St.LucieUnits1and2,wasissuedinNovember1995toinstitutionalize
theresultsofthereliefvalvedesignreviewteam.B.TheSTARprocesswasmodifiedtofacilitate
paralleldepartment
assignments
fortheevaluation
andcorrection
ofdeficiencies.
4.Thedatewhenfullcompliance
willbeachieved:
A.TheSTARprocessprocedure
wasmodifiedinOctober1995.B.Fullcompliance
forthereliefvalvesettingswillbeachievedduringtheSpring1996refueling
outage.
}}
}}

Revision as of 15:53, 29 June 2018

Responds to Violations Noted in Insp Repts 50-335/95-20 & 50-389/95-20.Corrective Actions:Multidiscipline Team Established to Perform Comprehensive Review of Nuclear safety-related Relief Valve Lift & Blowdown Settings
ML17228B368
Person / Time
Site: Saint Lucie  NextEra Energy icon.png
Issue date: 12/19/1995
From: GOLDBERG J H
FLORIDA POWER & LIGHT CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-95-333, NUDOCS 9512260055
Download: ML17228B368 (7)


See also: IR 05000335/1995020

Text

LXAMAXEA(ACCELERATED

RIDSPROCESSIiC

REGULATORY

INFORMATION

DISTRIBUTION

SYSTEM(RIDS)CESSIONNBR:9512260055

DOC.DATE:95/12/19NOTARIZED:

NOFACIL:50-335

St.LuciePlant,Unit1,FloridaPower&LightCo.50-389St.LuciePlant,Unit2,FloridaPower&LightCo.AUTH.NAMEAUTHORAFFILIATION

GOLDBERG,J.H.

FloridaPower&LightCo.RECIP.NAME

RECIPIENT

AFFILIATION

DocumentControlBranch(Document

ControlDesk)SUBJECT:Respondstoviolations

notedininsprepts50-335/95-20

50-389/95-20.Corrective

actions:multidiscipline

teamestablished

toperformcomprehensive

reviewofnuclearsafety-related

reliefvalvelift&blowdownsettings.

DISTRIEDTION

CODE:IEOIDCOPIESRECEIVED:LTR

IENCLgSIZE:TITLE:General(50Dkt)-InspRept/Notice

ofVioTation

ResponseNOTES:DOCKET0500033505000389RECIPIENT

IDCODE/NAME

PD2-1PDINTERNAL:

ACRSAEOD/SPD/RAB

DEDRONRR/DISP/PIPB

NRR/DRPM/PECB

NUDOCS-ABSTRACT

OGC/HDS3EXTERNAL:

LITCOBRYCE,JH'RCPDRCOPIESLTTRENCL11221111111111111111RECIPIENT

IDCODE/NAME

NORRIS,JAEOD/DEIB

AEOTCLECERNCTP/HHFBNRR/DRPM/PERB

OEDIRRGN2FILE01NOACCOPIESLTTRENCL111111111111111111VOTETOALL"RIDS"RECIPIEY'TS:PLEASEHELPUSTOREDUCEiVASTE!COYTACTTHE

DOCL'ifEYT

COYTROLDESK.ROOMPl-37(EXT.504.2083)TOELIXIIiATE5'OI.'RiAiIEFROilDISTRIBUTIOY

LISTSI'ORDOCI.'MEi'I'S

YOUDOi"I'ELIDIOTALNUMBEROFCOPIESREQUIRED:

LTTR20ENCL20

FloridaPower5LightCompany,P.O.Box128,FortPierce,FL34954-0128

FPLDEC191995L-95-33310CFR2.201U.S.NuclearRegulatory

Commission

Attn:DocumentControlDeskWashington,

D.'.20555Re:St.LucieUnits1and2DocketNo.50-335and50-389ReplytoNoticeofViolation

IninR-2-EA-222FloridaPowerandLightCompany(FPL)hasreviewedthesubject,noticeofviolation

issuedonNovember28,1995.Pursuantto10CFR2.201,theresponseisattached.

OnDecember1,1995,theNRCseniorresidentinspector

forSt.LucienotifiedFPLthattheresponsetothisnoticeofviolation

wasnotrequiredtobesubmitted

underoathoraffirmation

asoriginally

requested

'bythenoticeofviolation.

Verytrulyyours,J.H.oldbergPresident

-NuclearDivisionJHG/GRMAttachment

cc:StewartD.Ebneter,RegionalAdministrator,

USNRCRegionIISeniorResidentInspector,

USNRC,St.LuciePlantQf>P;~rVit~r9512260055

951219PDRADDCK050003359PDRanFPLGroupcompany

Re:St.LucieUnits1and2DocketNo.50-335and50-389ReplytoNoticeofViolation

InsecinRe-20Violation

EA5-22210CFR50,AppendixB,Criterion

XVI,"Corrective

Actions,"

requires,

inpart,thatmeasuresbeestablished

toassurethatconditions

adversetoqualityarepromptlyidentified

andcorrected.

Contrarytotheabove,conditions

adversetoquality,involving

reliefvalvesetpointandblowdownvalues,identified

onFebruary20,March2,andMarch10,1995,didnotreceivepromptcorrective

actionsandledtoarepeatofpreviously

identified

problemsonAugust10,1995,whenUnit1reliefvalveV-3439liftedandfailedtoreseatwithoutoperatorintervention.

Thesubjecteventresultedinapproximately

4000gallonsofreactorcoolantaccumulating

intheUnit1pipetunnel.Evaluations

performed

afterthiseventrevealedtheneedtoreplace,orestablish

newsetpoints

for,severalreliefvalvesinsafetysystemsinbothunits.ThisisaSeverityLevelIVviolation

(Supplement

I).FPLRne1.Thereasonfortheviolation:

Theseriesofreliefvalveeventsthatoccurredinearly1995tookplaceindifferent

plantsystemsandinvolvedbothSt.LucieUnit1andUnit2.Initialplanteffortstocorrecttheseindividual

planteventswerefocusedonsolvingtheplantsystemcontrolproblemsthatledtothepressuretransients

causingtheseriesofreliefvalveactuation.

Briefly,theseeventsarediscussed

below:ThecausesoftheUnit1andUnit2letdownevents(betweenJanuary23,1995andJuly8,1995)wereassociated

withletdownpressurecontrolproblems.

Thecorrective

actionswerefocusedontheletdownpressurecontrolvalveperformance.

ThecauseoftheUnit2component

coolingwaterreliefvalveactuation

event(February

17,1995)wasatestconfiguration

problem.AtthetimeoftheNRCinspection

forthesubjectinspection

report,asystemtransient

testwasbeingdeveloped

toevaluatetheconfiguration

problem.

l

ThecauseoftheUnit1shutdowncoolingsuctionreliefevent(February

27,1995)wasaflowinitiated

pressuretransient.

Thecorrective

actionwastheimplementation

ofaprocedure

changewhichmitigates

thepotential

forpressuretransients

whileplacingshutdowncoolinginservice.Longtermcorrective

actionsarediscussed

inparagraph

2.D.ThecauseoftheUnit1shutdowncoolingdischarge

relief(V3439)event(August10,1995)wasidentified

asadesignliftandblowdownsetpointproblem.Oncetherelieflifted,itdidnotreseatwithoutoperatorintervention

toisolatetheaffectedportionofthesystem.Thecorrective

actionsweretoreplacethevalveV3439andtoincreasethereliefvalveliftsetpointandtoreducetheblowdownsettingtherebyproviding

additional

operating

margin.Theseindividual

eventsdidnotappeartoshareacommonrootcauseandcorrective

actionstoresolvetheseindividual

problemswerepromptlyinitiated

byplantmanagement.

Agenericreliefvalvesetpointconcernwasidentified

bytheOperations

Supervisor

onMarch2,1995(following

theFebruary27,1995event),andwasassignedtoMechanical

Maintenance

forresolution.

BetweenMarchandAugustof1995,Maintenance

focusedondeveloping

threecorrective

actions:1)anewreliefvalvetestbench,2)revisions

tovalvetestprocedures,

and3)improvedmaintenance

training.

Maintenance

hadnotconsidered

adesignproblemwithreliefvalvesetpoints

and,therefore,

effortsweredirectedtowardverifying

thatthereliefvalvescouldbesetinaccordance

withplantdesign.Theunderlying

rootcausefortheseriesofreliefvalveevents-lackofdesignintegration

betweensystemoperating

pressures

andreliefvalvereseatpressures

-wasnotevidentuntiltheSt.LucieUnit1shutdowncoolingdischarge

reliefevent(August10,1995).Atthattime,theEngineering

Department

established

amulti-disciplined

teamtoinvestigate

safety-related

reliefvalveliftandreseatsettings.

TheSt.LucieActionRequest(STAR)processwasacontributing

factortothedelayinfindingtheunderlying

rootcauseoftheevents.TheSTARprocessreliedonseriesassignments

foractionsanddidnotlenditselftoparallelinvestigations

orcorrective

actions.Thecorrective

stepsthathaveorwillbetakenandtheresultsachieved:

A.Thecorrective

actionstakentoaddressthespecificproblemofsafetyrelatedreliefvalveliftandblowdownsettingsandcontrolofreliefvalvedesigninformation

wereprovidedintheUnit1LicenseeEventReport(LED)95-06,andatthepre-decisional

enforcement

conference

onNovember14,1995.

B.InAugust1995,amulti-discipline

teamwasestablished

toperformacomprehensive

reviewoftheSt.LucieUnit1andUnit2nuclearsafetyrelatedreliefvalveliftandblowdownsettings.

Theteamwascomposedofpersonnel

fromMaintenance,

Operations,

PlantSystemEcComponent

Engineering,

andNuclearEngineering.

Atotalof114reliefvalveswerereviewed(53forUnit1and61forUnit2)andtheirdesignsettingswereevaluated

relativetosystemoperating

andtransient

pressures.

Seventeen

ofthesevalvesrequiredadditional

analysis.

Corrective

actions,exceptasnotedin2.Dbelow,havebeentakentoincreasethemarginbetweensystemoperating

pressures

andthelift/reseat

setting,whereappropriate.

C.Unit1reliefvalvemodifications,

withtheexception

oftheshutdowncoolingsuctionoverpressure

reliefvalves,V3468andV3483,wereimplemented

priortotheOctober1995startup,following

theshutdownrelatedtoHurricane

Erin.D.Unit1shutdowncoolingsuctionoverpressure

reliefvalves,V3468andV3483,liftsettingswereadjustedtoimprovetheliftmarginpriortotheOctober1995startup.Withtheserevisedliftsettings,

shutdowncoolingcanbeinitiated

withoutchallenging

thesereliefvalves.TheliftandblowdownsettingswillbefurthermodifiedduringtheSpring1996refueling

outage.E.Unit2reliefvalvemodifications

wereimplemented

duringtheFall1995refueling

outage.3.Thecorrective

stepstakenorplannedtoavoidfurtherviolations:

~A.FPLMaintenance

Specification

SPEC-M-038,

SafetyRelatedReliefValveSetpoints

St.LucieUnits1and2,wasissuedinNovember1995toinstitutionalize

theresultsofthereliefvalvedesignreviewteam.B.TheSTARprocesswasmodifiedtofacilitate

paralleldepartment

assignments

fortheevaluation

andcorrection

ofdeficiencies.

4.Thedatewhenfullcompliance

willbeachieved:

A.TheSTARprocessprocedure

wasmodifiedinOctober1995.B.Fullcompliance

forthereliefvalvesettingswillbeachievedduringtheSpring1996refueling

outage.