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A.INTRODUCTIONParagraph(h),ProtectionSystems,of§50.55a,CodesandStandards,of10CFRPart50,UcensingofProductionandUtilizationFacilities,requiresthatprotectionsystemsmeettherequirementssetforthintheInstituteofElectricalandElectronicsEngineersCriteriaforNuclearPowerPlantProtectionSystems(IEEE279)1.Section4.17,ManualInitiation,ofIEEEStd279-1971requiresthatprotectionsystemsincludemeansformanualinitiationofeachprotectiveactionatthesystemlevelandthatthesingle-failurecriterionassetforthinSection4.2ofIEEE279bemet.ThisguidedescribesamethodacceptabletotheAECRegulatorystaffforcomplyingwiththerequirementsofSection4.17ofIEEEStd279-1971forincludingthemeansformanualinitiationofprotectiveactions.Thisguideappliestoalltypesofnuclearpowerplants.TheAdvisoryCommitteeonReactorSafeguardshasbeenconsultedconcerningthisguideandhasconcurredintheregulatoryposition.B.DISCUSSIONSection4.17ofIEEEStd279-1971includesamongitsrequirementsthefollowing-(1)manualinitiationofeachprotectiveactionshallbeprovidedatthesystemlevel,(2)nosinglefailureshallpreventinitiationofprotectiveaction,and(3)manualInitiationshalldependupontheoperationofaminimumofequipment.Ithasbeencontendedthatinordertomeettherequirementofaminimumofoperatingequipment,manualinitiationatthesystemlevelcouldbeachievedbytheactuationoftheseveralindividualmanualswitchesoftheprotectionsystemcomponents.'CopiesmaybeobtainedfromtheInstituteofElectricalandElectronicsEngineers,345East47thStreet.NewYojk,N.Y.10017.October1973GUIDEHowever,theactuationoftheseveralindividualmanualswitchesdoesnottakeintoaccounttheperformanceofotheractionsessentialinsystem-levelinitiationsuchasstartingauxiliaryorsupportingsystems,sendingsignalstoappropriatevalve-actuatingmechanisnmtoassurecorrectvalveposition,orprovidingrequiredaction-sequencingfunctionsandanyrequiredinterlocks.C.REGULATORYPOSITION1.Meansshouldbeprovidedformanualinitiationofeachprotectiveaction(e.g.,reactortrip,containmentisolation)atthesystemlevel,regardlessofwhethermeansarealsoprovidedtoinitiatetheprotectiveactionatthecomponentorchannellevel(e.g.,individualcontrolrod,individualisolationvalve).2.Manualinitiationofaprotectiveactionatthesystemlevelshouldperformallactionsperformedbyautomaticiitiationsuchasstartingauxiliaryorsupportingsystems,sendingsignalstoappropriatevalve-actuatingmechanismstoassurecorrectvalveposition,andprovidingtherequiredaction-sequencingfunctionsandinterlocks.3.TheSwitchesformanualinitiationofprotectiveactionsatthesystemlevelshouldbelocatedinthecontrolroomandbeeasilyaccessibletotheoperatorsothatactioncanbetakeninanexpeditiousmanner.4.Theamountofequipmentcommontobothmanualandautomaticinitiationshouldbekepttoaminimum.Itispreferabletolimitsuchcommonequipmenttothefinalactuationdevicesandtheactuatedequipment.However,action-sequencingfunctionsandinterlocks(ofPosition2)associatedwiththefinalactuationdevicesandactuatedequipmentmaybecommonifindividualmanualinitiationatthecomponentorchannellevelisprovidedinthecontrolroom.NosinglefailurewithinUSACREGULATORYGUIDESCaopiofptluledquihesmaybeobtalnedbysefutIdicatir.Uwdaomoimlrd0UUS.AtomicEnergyCommision.Wultington.D.C.20545.legulatoryGuldesasbsuedtodwermaendmikeevalldleSothePublicAttbntlon:DirectorofRegulatoryStandards.CommentsandauggWtloesforamtiodsembietotheAECRegulatoryMRaffIouplementltiucleruorImprovernsInanejuldesweencouraedandehouldbesnttoteSecretarytheo,2n=bsvueautllomi,todelkieettadnqususedbythesalIofthCommson.U..AtomicEnergyion.Wmhlnton.DC.20545.esluetingquedflcproblemsorpotubtedeorldenu.ortoProvideguldenostoAttention:Chief.PublicPooismding.Staff.applinu.RegulatoryGuidesemnotaubsttkutasfornulatlonsendcompilancewithsiem.notrequiredMethodsandeolutionsdifferentfrmthosestoutInThelidnweblAdInthefollowingtanbroeddivisions:On=,1wbeecuptbleftheyaebesforthefindngsrequistetobeI.T=ceoreant-nufnmORbywt6.Products2.ftearchidTOOR~camrs7.Trrpralom.&.FuetsandMaterialsFecilitlsS.OccuploelNeelthFPlAWedguidswillbevisedPeriodically.aappropriate.toaccommodate4.EatlrormentalandSitingS.AntitritReviewCmmntsdtrelectnewInformationrexplenf.S.MaterialsendPlantProtelonI.GeneralU.S.ATOMICENERGYCOMMISSIONREGULATORYDIRECTORATEOFREGULATORYSTANDARDSREGULATORYGUIDE1.62MANUALINITIATIONOFPROTECTIVEACTIONSthemanual,automatic,orcommonportionsoftheprotectionsystemshouldpreventinitiationofprotectiveactionbymanualorautomaticmeans.S.Manualinitiationofprotectiveactionsshoulddependontheoperationofaminimumofequipment,consistentwith1.2,3,and4above.6.Manualinitiationofprotectiveactionatthesystemlevelshouldbesodesignedthatonceinitiated,itwillgotocompletionasrequiredinSection4.16ofIEEEStd279-1971.1.62-2