ML17037B640

Nine Mile Point Unit 1 - Letter Regarding a Determination That the Technical Specifications Should Be Revised to Incorporate Instrumentation System Requirements Which Meet the Enclosed NRC Staff Technical Position

ML17037B640
Person / Time
Site:	Nine Mile Point
Issue date:	02/04/1977
From:	Goller K R Office of Nuclear Reactor Regulation
To:	Rhode G K Niagara Mohawk Power Corp
References
Download: ML17037B640 (6)

Text

DocketHo.60-220NiagaraHoha~ikPowerCorporation'TTN:Hr.GeraldK.RhodeVicePresident-Engineering300ErieBoulevardWestSyracuse,Nev~York13202Gentlemen:RE:MINEttILEPOINTNUCLEARSTATIONUHITNO.1'Jehavecompletedourpreliminaryreviewoi'heinformationyousubmittedonNovember0,1976,regardingtheinstrumentationsystemsavailableatyourfacilitytomonitordrywelltotorusdifferentialpressure(AP)andtoruswaterlevel.ThisinformationwasprovidedinresponsetoourletterdatedSeptember30,1976,regardingTechnicalSpecificationrequirementsassociatedwiththeHarkIContainr>entShortTemProgramPlantUniqueAnalyses.Basedonourrevie~ioftheinformationprovidedinyourresponseandyourexistingTechnicalSpecificationrequirementsforinstrumIentationsystemsI;hichcouldbeusedtomonitordrywelltotorusAPandtoruswaterlevel,wehavedeterminedthat.yourTechnicalSpecificationsshouldberevisedtoincorporateinstrumentationsystemrequirementswhichmeettheHRCstafftechnicalpositiondetailedintheenclosure.Consequently,youarerequestedtoprovidethefollowinginformationandcommitmentswithin20daysofreceiptofthisletter:a.Yourcommitmenttoinstal'tinstrumentationsystemstomonitordrywelltotorushPandtorussiaterlevelwhichmeettheminimumrequirementsoftheenclosedNRCstafftechnicalposition;b.Yourscheduleforcompletionoftheinstallationofsuchsystems;andc.YourcommitmenttorequestappropriateTechnicalSpecificationchangesrelatingtothisinstrumentationfollow)nginstallation.OPPICK~dURNAMBWOATKWNRCFORM518(9.76)NRCM02404V;8,4OVBRNMBNTPRINTIN4OPPICBISOTdd2~~

JJF/yveseiIerkE~.~$'FelII,IIIeeeE'lkF~I',ke<<r.I1"'-I'FJJB")Vk,e1l7:.1ic'1.>>e.k1 NiagaraMohawkPo>verCorporation Installationoftheabove-mentionedinstrumentationsystemsandyourrequestforappropriateTechnicalSpecificationchangesshouldbeaccomplishedinanexpeditiousmannerbutnolaterthanApril15,1977.'

Enclosure:

NRCStaffTechnicalPositionKarlR.Goller,Assi'stantDirectorforOperatingReactorsDivisionofOperatingReactorscc:ArvinE.Upton,EsquireLeBoeuf,Lamb,Leiby8ttacRae1757NStreet,N.W.t/ashington,D.,C.20036AnthonyZ.Roisman,EsquireRoisman,KesslerandCashdan102515thStreet,'.I$.5thFloor.-Mashington,D.C.20005ftr.EugeneG.Saloga,ApplicantCoordinatorNineNilePointEnergyInformationCenterP.0.Box81Lycoming,NewYork13093DISTRIBUTION:DocketTBAbernathyNRCPDR-JRBuchananLocalPDRACRS(16)ORB83RdgFileTJCarterGiLearCParrish.SNov{ickiJGuibertDEisenhut,.OELDOI8S(3.}OFFICE~SUAHAMEWOATE~.....Q.RBX.....JGuiber1/'3~/77...g.3.......,.....ORBS'.SNoviicki,acr,...Gj.ga.0$ijYi>>)i:~SKI....,AD/DOR~...jc;RGoller:........,...............A.-,.3,......,./7.?..Es'ENRCFORhf318(sI-76)NRChf02406UI0,OOVEANMEATPAINTINOOFFICEs1174dddd&

~4fI4'II'4/44I~IfI4I~I.IeI4ipphtIg4I'!~hff4'I.*'I,I)Irh<<4444I~Ifr,;Pell,~4I444 ENCLOSURE1NRCStaffTechnicalPositionOnInstrumentationSstemstoHonitorTorustoDrywellDifferentialPressureandTorusWaterLevelIlInconsiderationofthesignificanceofdrywelltotorusdifferentia'1pressure(LP)controlandtoruswaterlevelcontroltotheresultsoftheHarkIContaimentShortTermProgramPlantUniqueAnalyses,wehaveconcludedthataminimumoftwonarrowrangeinstrumentchannelsshouldbeprovidedtomonitoreachoftheseplantparameters.Operationalexperienceindicatesthatpressuretransducerstendtodriftandwaterlevelindicatorstendtostick;theseobservations,togetherwithstandardinstrumentcalibrationfrequencyrequirements,formthebasisforourrequirementsforaminimumoftwoinstrumentchannelsperparameter.ThesignificanceofvariationsindrywelltotoruszPandtoruswaterlevelan/themagnitudeoftheLOCA-relatedhydrodynamicloadsontorussupportsystemsformsthebasisforourrequirementfornarrowrangeinstrumentationtoaccuratelymeasuretheseparameters.Theerror-bandoftheinstrumentationusedtomonitorthedrywell-wetwel1differentialpressureandthetoruswaterlevelshouldbesmallincomparisontotheabsolutevalueoftheparameterbeingmeasured.BasedontheloadsensitivitycurvespresentedinAddendum2tothetlarkIContainmentShortTermProgramFinalReportandtypicalinstrumentaccuracies,weconcludethattheerrorinthehPmeasurementshouldbenogreaterthan+0.1psidandthattheerrorinthetoruswaterlevelmeasurementshouldbenogreaterthan10"ofthedifferencebetweenthemaximumandminimumtoruswaterlevel(i.e.,ifthedifferencebetweenmaximumlevelandminimumlevel=4",thentheinstrumenterrorshouldbe<.4").TheTechnicalSpecificationsforeachHarkIBWRfacility(exceptBrunswickUnitsNos.1and2)shouldincluderequirementsconsistentwiththisposition.Actiontobetakenintheeventthatoneorbothoftheinstrumentchannelsisoutofserviceshouldbeconsistentwithotherrequirementsforsurveillanceinstrumentation.

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