ML17037C462

Nine Mile Point Nuclear Power Station, Unit 1 - Letter Transmitting Proposed Changes to Technical Specifications for the Maintenance of Pressure Suppression Chamber Integrity

ML17037C462
Person / Time
Site:	Nine Mile Point
Issue date:	02/15/1974
From:	Raymond P D Niagara Mohawk Power Corp
To:	Ziemann D L US Atomic Energy Commission (AEC)
References
Download: ML17037C462 (8)

Text

AECDIS"BUTIONFORPART50DOCKETMATE(TEMPORARYFORM)CONSOLNO:FROM:NiagaraMohawkPowerCorporationSyracuse,N.Y.13202PhilipD.RaymondTo:D.L.ZiemannDATEOFDOC2<<15-74ORIG1signedDATEREC'D2-20-74CCOTHERFILE:LTRMEMOOTHERSENTAECPDRSENTLOCALPDRXXXCLASSUNCLASSPROPINFOXNPUTXXXNOCS'REC'D40DOCKETNO:50-220ENCLOSURES:Proposedchangestotechspecs.ACKNOW,ED"ED(40cysenclrec'd)DONOTREMOVEPLANTNAME:NineMilePoint81FORACTION/XNFORtiATION220-74JBDESCRXPTION:Ltrreour12-19-73ltr...transthefollowing...BUTLER(L)W/CopiesCLARK(L)W/CopiesGOLLER(L)'W/"CopiesKNIEL(L)W/CopiesSCHWENCER(L)W/CopiesSTOLZ(L)W/CopiesVASSALLO(L)'/CopiesSCHEMEL(L)W/Copies~ZIEMANN(L)W/PCopiesDICKER(E)W/CopiesKNIGHTON(E)"W/CopiesYOUNGBLOOD(E)W/CopiesREGAN(E)W/CopiesW/CopiesW/Copies~W/CopiesINTERNALDISTRIBUTXONREGAECPDR<OGC,ROONP-506A>MUNTZING/STAFFCASEGIAMBUSSOBOYDMOORE(L)(BWR)DEYOUNG(L)(PWR)I/SKOVHOLT(L)-P.COLLINSDENXSE~BEGOPRPILEAREGION(Q}MORRISSTEELETECHREVIEWHENDRIESCHROEDERMACCARYKNIGHTPAWLICKXSHAOSTELLOHOUSTONNOVAKROSSXPPOLXTOTEDESCOLONGLAINASBENAROYAVOLLMERDENTONGRIMESGAMNILLKASTNERBALLARDSPANGLERENVIROMULLERDICKERKNIGHTONYOUNGBLOODREGANPROJECTLDRHARLESSLICASST~DIGGS(L)GEARIN(L)GOULBOURNE(L)LEE(L)MAIGRET(L)SERVICE(L)SHEPPARD(E)SMITH(L)TEETS(L)WADE(E)WILLIAMS(E)WILSON(L)S,REED(L)A/IINDBRAIDCINSALTZMANB.HURTPLANSMCDONALD~UBEw/InputINFOC.MILESB.KINGWi'A".Cab'ellW-LOCALPDROsweo/N.Y,."DTXE(ABERNATHY)-NSIC(BUCHANAN)1-ASLB(YORE/SAYRE/WOODARD/"H"ST.416-CYSACRSHE6RR%SenttoDiggAt2-20-74EXTERNALDISTRIBUTION(1)(2)(10)-NATIONALLAB'1-ASLBP(E/WBldg,Rm529)1-.W.PENNINGTON,RmE>>201GT1-CONSULTANT'SNEWMARK/BLUME/AGBABIAN1-GERALDULRIKSON...ORNL1-PDR-SAN/LA/NY1-GERALDLELLOUCHEBROOKHAVENNAT.LAB1"AGMED(RuthGussmap)HM"B-127,GT.1-RD..MULLER.,F-309GT

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~"-~<<~a~I'FP%ay'IAGARAMOHAWKPOWERCORPORATION.,4FIIIII;NIAGARAI'MOHAWK300ERIEBOULEVARDWESTSYRACUSE,N.Y.13202February15,1974QOcps~Mr.DennisL.ZiemannChief,OperatingReactorsBranch82DirectorateofLicensingUnitedStatesAtomicEnergyCommissionWashington,D.C.20545

DearMr.Ziemann:

ZSoRe:NineMilePointUnit1DocketNo.50-220*FIInresponsetoyourletterofDecember19,1973,aproposedTechnicalSpecificationforthemaintenanceofpressuresuppressionchamberintegrityatNineMilePointUnit1isattached.ThisSpeci-ficationincludesaLimitingConditionforOperation,aSurveillanceRequirement,andBases.WehavebeenadvisedthatthegeneralsubjectofcontainmentsurveillancehasbeenplacedontheagendaoftheSubcommitteeforMetalContainment,SubsectionNE,SectionIII,ASMEBoilerandPressureVesselCode.Accordingly,theattachedSpecificationshouldbecon-sideredaninterimrequirementwhichmaybeamendedtoreflectapplicableASMECoderequirementsifandwhentheyareformulated.Verytrulyyours,PhilipD.ondVicePresient-EngineeringCVM/sjzAttachmentCA4'OPPg<>~lpO'+Z@eO,c 0'v~t."4g'".2~g>>gJ, c,3.3.8Presl1sure',SuppssionChamberIntegrityAppliestotheoverallintegrityofthepressuresuppressionchamber.~Obe'ctive:Toassurethatthepressuresuppressionchamberiscapableoflimitingradiationexposuretothepublictothevaluesspecifiedin10CFR100,andtomonitorthedynamiceffectsonthepressuresuppressionchamberofreliefvalveblowdownsintothechamberwater.b'if'heneverthereactorcoolantsystemtemperatureisabove215F,thepressuresuppressionchamberintegrityshallbemaintainedandchamberwallthicknessshallbegreaterthan0.420inches.4.3.8PressureSuppressionChamberIntegrityAppliestotheperiodicinspectionofthepressuresuppressionsystem.~obective:Toassurethatthepressuresuppressionchamberintegrityiswithinthespecifiedlimits.a.Onceeachoperatingcycleduringthemajorrefuelingoutage,five(5)preselectedareasofthesuppressionchamber,wallshallbeultrasonicallyexaminedforsectionthickness.b.Avisualinspectionofthesuppressionchamberinterior,includingwaterlineregionsandsupportsshallbemadeateachmajorrefuelingoutage.BASESThevaluesspecifiedforminimumwallthicknessofthepressuresuppressionchamberhavebeenestablishedbaseduponthedesignofthepressuresuppressionchamberinconformancewithSectionIII,ClassBoftheASMECode.,ThedesignspecificationallowsaI/16inchcorrosionallowancetotheunpaintedinteriorsurfaceofthechamber.Thuswithadesignthicknessof0.3975inchthecorrosionallowanceincreasesthethicknessto0.460inch.How-ever,manufacturingincreasesthethicknesstoa,nominal0.500inchallowing0.1025inchgreaterthandesign.Thelimitof0.420inchprovidesamaiginoverthedesignthicknessandassuressuppressionchamberintegrity.

f1l BASES,ContinuedTheinspectionfrequencyasestablishedisconservativebasedontheobservedchangeinthicknessasdeterminedfrom1972measure-mentsto1973measurementsinwhichtherewasnoperceptiblechangeaftermorethan20individualreliefvalveoperations.Todeterminethestatusofthepressuresuppressionsystem,avisualinspectionofthesuppressionchamberinteriorsurFacesandstructure,withwateratitsnormalelevation,willbemadeateachmajorrefuelingoutage.Thisinspectionwillassurethatanygrossdefectsaredetected.

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