ML18038A136

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Requests Exemption to Exclude Certain Relief Valves from Type C Testing Contained in Section Ii.H of App J of 10CFR50.Valves Located Inside Primary Containment or Discharge to Suppression Pool from Outside
ML18038A136
Person / Time
Site: Nine Mile Point Constellation icon.png
Issue date: 03/05/1986
From: MANGAN C V
NIAGARA MOHAWK POWER CORP.
To: ADENSAM E G
Office of Nuclear Reactor Regulation
References
(NMP2L-0649), (NMP2L-649), NUDOCS 8603110343
Download: ML18038A136 (14)


Text

REGULATORY NFORNATION DISTRIBUTION SY1'EN(RIDS)ACCESSION NBR:8603110343 DOC.DATE:86/03/05NOTARIZED:

YES,,DOCKET¹FACIL:50-410NineMilePointNuclearStation>Unit2>NiagaraNoha05000410AUTH.NANEAUTHORAFFILIATION NANGAN>C.V.NiagaraMohawkPowerCorp.RECIP.NANERECIPIENT AFFILIATION

  • DENSAN>E.G.BWRProJectDirectorate 3SUHCT;Requestsexemption toexcludecertainreliefvalvesfromTypeCtestingcontained inSec'tionII.HofApp4of10CFR50.Valveslocatedinsideprimarycontainment ordischarge tosuppression poolfromoutside.DISTRIBUTION CODE:H001DCOPIESRECEIVED:

LTRENCLSIZE:TITLE:Licensing Submittal:

PSAR/FSAR AmdtsZcRelatedCorrespondence NOTES'ECIPIENTIDCODE/MANE BWRADTSHWREBHWRFOBHAUGHEY>M01BWRRSHINTERNAL:

ACRS41ELD/HDS3IE/DEPER/EPB 36NRRBWRADTSNRRPWR-H*DTSQRRPH/HFIHREGFILE04/NIBEXTERNAL:

24XDNB/DSS(ANDTS)NRCPDR02PNLGRUEL>RCOPIESLTTRENCL1111112211610111010110111111RECIPIENT IDCODE/NAME BWRPD3PDBWREICSBHWRPD3LABWRPSBADN/LFMBIEFILEIE/DGAVT/GAB 21NRRPWR-AADTSNRR'OE>M.Ll4RR/DHFT/NTB RGN1BNL(AMDTS ONLY)LPDR03NSIC05COPIESLTTRENCL11111'1110111110111133111111TOTALNUMBEROFCOPIESREQUIRED:

LTTR39ENCL33 4lI4IIlf1flI"~IMIf4444rI~IIIEM,,"'44C.)4fdI~IEI'IIM~~Ilk NIAGARAMOHAWKPOWERCORPORATION/300 ERIEBOULEVARD WEST.SYRACUSE, N.Y.13202/TELEPHONE (315)474-1511March5,1986(NMP2L0649)Ms.ElinorG.Adensam,DirectorBHRProjectDirectorate No.3U.S.NuclearRegulatory Commission 7920NorfolkAvenueNashington, DC20555

DearMs.Adensam:

Re:NineMilePointUnit2DocketNo.50-410NiagaraMohawkPowerCorporation

("NiagaraMohawk")herebyrequestsexemptions pursuantto10CFR50.12(a)fromTypeCtestrequirements of10CFRPart50AppendixJ.Specifically, NiagaraMohawkrequeststheexclusion ofcertainreliefvalvesfromTypeCtestingcontained inSectionII.HofAppendixJ.Theexemption hasbeenreviewedandfoundtobeauthorized bylawandconsistent withthecommondefenseandsecurity.

Theattachment tothisletterdemonstrates thattherequested exemption presentsnounduerisktothehealthandsafetyof,thepublicandthatspecialcircumstances arepresentthatjustifygrantingtheexemptions.

Withregardtothe"commondefenseandsecurity"

standard, thegrantoftherequested exemptions isconsistent withthecommondefenseandsecurityoftheUnitedStates.TheCommission's Statement ofConsiderations insupportoftheexemption rulenotewithapprovaltheexplanation ofthisstandardassetforthinLonIslandLihtinComan(Shoreham NuclearPowerStation,Unit1),LBP-84-45, 20NRC1343,1400(October29,1984).There,theterm"commondefenseandsecurity" refersprincipally tothesafeguarding ofspecialnuclearmaterial, theabsenceofforeigncontrolovertheapplicant, theprotection ofRestricted Data,andtheavailability ofspecialnuclearmaterialfordefenseneeds.Thegrantingoftherequested exemptions willnotaffectanyofthesemattersandthussuchgrantisconsistent withthecommondefenseandsecurity.

Theproposedexemption hasbeenanalyzedanddetermined nottocauseadditional construction oroperational activities whichmaysignificantly affecttheenvironment.

Theydonotresultinasignificant increaseinanyadverseenvironmental impactpreviously evaluated inthefinalEnvironmental ImpactStatement-Operating LicenseStage,asignificant changeineffluents orpowerlevelsoramatteruotpreviously reviewedbytheNuclearRegulatory Commission whichmayhaveasignificant adverseenvironmental impact.IIPDR lI tMs.ElinorG.AdensamPage2NiagaraMohawkisreadytomeetwiththecognizant NuclearRegulatory Commission personnel toreviewthesemattersshouldyourequireadditional information.

Verytrulyyours,C.V.MangSeniorVicePresident NLR:ja1380Gxc:R.A.Gramm,NRCResidentInspector ProjectFile(2)

~%

UNITEDSTATESOFAMERICANUCLEARREGULATORY COMMISSION IntheMatterofNiagaraMohawkPowerCorporation,

)(NineMilePointUnit2))DocketNo.50-410AFFIDAVIT C.V.Manan,beingdulysworn,statesthatheisSeniorVicePresident ofNiagaraMohawkPowerCorporation; thatheisauthorized onthepartofsaidCorporation tosignandfilewiththeNuclearRegulatory Commission thedocuments attachedhereto;andthatallsuchdocuments aretrueandcorrecttothebestofhisknowledge, information andbelief.Subscribed andswortobeoreme,aNotaryPublicindforteStateofNewYorkandCountyof,thisRY"dayof1986.NtarPublicinandforCounty,NewYorkMyCommission expires:JANISM.MACRONotaryPubttcIntheStateotNewYorkQualitied InOnondagaCountyNo.470455atycommlsslon r.xrrlrcs arcr

~i ATTACHMENT

~EX~ltUESRELIEFVALVESTYPECTESTINGItisrequested thatanexemption beissuedtoexcludecertainreliefvalvesfromtherequirements ofSectionII.Hof10CFRPart50,AppendixJ.Thesevalveseitherarelocatedinsidetheprimarycontainment ordischarge tothesuppression poolfromoutsidetheprimarycontainment.

Thedischarges ofthereliefvalveswouldbeexposedtocontainment atmosphere following alossofcoolantaccident.

Alistingofthesevalvesisprovidedbelow:a.ResidualHeatRemovalSystem(RHS)l.2.3.4.5.6.2RHS*RV20A, B,C2RHS*RV61A, B,C2RHS*RV108 2RHS*RV110 2RHS*RV139 2RHS*RV152 b.LowPressureCoreSpray(CSL)1.2CSL*RV105 2.2CSL*RV123 c.HighPressureCoreSpray(CSH)1.2CSH*RV113 2~2CSH*RV114 d.ReactorBuildingClosedLoopCoolingWater(CCP)1.2CCP*RV170 2.2CCP*RV171 Thereliefvalvesandassociated containment penetration pipingareallSeismicCategoryI,SafetyClass2components.

Thegrantoftherequested exemption willnotpresentanunduerisktothepublichealthandsafety.ThesevalvesareallincludedintheTypeAprimarycontainment integrated leaktest.Thedischarge pipingofthevalvesisexposedtoeitherdrywellorwetwellpressureduringthetest.Thepurposeofthisexemption requestistowaivetherequirement forTypeCtestingofthesevalvesinaccordance with10CFR50AppendixJ.TheywillbeincludedintheTypeAtestinstead.Thebasisforthisexemption requestistheALARAanddesignconsiderations relatedtotheconductoftheTypeCtestforthesevalves.

~~Allthevalvesarelocatedinpotentially highradiation areas.Theyrequiredismantling ofdischarge pipingtoperformthetest,sincetherearenomaintenance valvestoprovideatestboundary.

Thereliefvalveswerepurposely designedwithoutsurrounding blockvalvestocomplywiththeguidanceofSubsection NC7000oftheASMECode,SectionIII.Thus,preparations andperformance forTypeCtestingofthesevalvescouldresultinexcessive radiation exposuretoplantpersonnel.

ThisiscontrarytoALARApoliciesconsidering thatthevalvescanbeincludedintheTypeAtest.InadditiontoALARAconcerns, otherconsiderations supporttheexemption ofthese'valves fromTypeCtestrequirements.

Allthevalveslocatedinthesecondary containment (13outof16valves)discharge intocommonheaderswhichpenetrate theprimarycontainment wallandthenturndownintothesuppression pool.Toprovideatestboundaryforindividual valveswouldrequireblankflangesineachvalvedischarge line.Theseflangeconnections wouldthemselves represent additional leakagepathsfromtheprimarycontainment.

Also,theseflangeconnections wouldrequireType8testing,therebyaggravating theALARAconcerns.

ItshouldalsobenotedthatLOCApressureandvalvespringpressuretendtoseatthevalvesagainstleakage.Forthethreevalveslocatedinsidethedrywell,i.e.,CCP*RV170, 171andRHS"RV152, thereislittlelikelihood ofanyleakagetothesecondary containment.

Theonlypaththroughthesevalvesisacrossthevalveseat.LOCApressureopposesthenormalvalveopening,andthevalvesprings,setforreliefpressures of100psigto1575psig,assistinseatingthevalves.Furthermore, anyleakagethatmightoccurwouldbedetectedduringnormalsystemoperation.

Systemoperating pressures arehigherthanLOCApressureandtendtoopenthevalves.Thus,anyvalveseatdegradation wouldbeevidentduringsystemoperation priortoreachingacondition thatwouldpermitsignificant post-LOCA leakage.Leakagethroughthesevalveswouldbedetectedearlybyseveralmeans,e.g.,lossofexpansion tanklevel(CCP),alossofreactorlevel(RHS),andanincreaseindrywellfloordraintanklevel.Basedontheaboveconsiderations, exclusion ofthesafetyreliefvalvesfromtheTypeCtestingwouldpresentnounduerisktothepublichealthandsafety.

SpeciCircumstances arePresentWhichWarrantIssuanceoftheRevestedExemtionsSpecialcircumstances arepresentwhichwarrantissuanceoftherequested exemption.

Thesespecialcircumstances arediscussed inaccordance withtheclassification contained intherule.(i)"Application oftheregulation intheparticular circumstances conflicts withotherrulesorrequirements oftheCommission; or"Aspreviously discussed, AppendixJisinconflictwithALARAconsiderations.

Thus,specialcircumstances arepresentwhichwarrantgranti,ng

.theexemption...

(ii)"Application oftheregulation intheparticular circumstances wouldnotservetheunderlying purposeoftherule..."Aspreviously discussed, toprovideatestboundaryforcertainindividual valveswouldrequireblankflangesineachvalvedischarge line.Theseflangeconnections wouldthemselves represent additional leakagepathsfromtheprimarycontainment.

Thus,specialcircumstances arepresentwhichwarrantgrantingtheexemption.

(ii)"Application oftheregulation i'ntheparticular circumstances

...isnotnecessary toachievetheunderlying purposeoftherule;orTheunderlying purposeoftheruleistoassurealowleakagecontainment withtheultimateobjective ofkeepingaccidentdoseslow.ThesevalvesareallincludedintheTypeAprimarycontainment integrated leaktest.Thedischarge pipingofthevalvesisexposedtoeitherdrywellorwetwellpressureduringthetest.Thus,specialcircumstances arepresentwhichwarrantgrantingtheexemptions.

IPL