Designation:C992−16StandardSpecificationforBoron-BasedNeutronAbsorbingMaterialSystemsforUseinNuclearFuelStorageRacksinaPoolEnvironment1ThisstandardisissuedunderthefixeddesignationC992;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationdefinescriteriaforboron-basedneu-tronabsorbingmaterialsystemsusedinracksinapoolenvironmentforstorageofnuclearlightwaterreactor(LWR)spent-fuelassembliesordisassembledcomponentstomaintainsub-criticalityinthestorageracksystem.1.2Boron-basedneutronabsorbingmaterialsystemsnor-mallyconsistofmetallicboronorachemicalcompoundcontainingboron(forexample,boroncarbide,B4C)supportedbyamatrixofaluminum,steel,orothermaterials.1.3Inaboron-basedabsorber,neutronabsorptionoccursprimarilybytheboron-10isotopethatispresentinnaturalborontotheextentof18.360.2%byweight(dependinguponthegeologicaloriginoftheboron).Boron,enrichedinboron-10couldalsobeused.1.4Thematerialssystemsdescribedhereinshallbefunc-tional–thatisalwaysbecapabletomaintainaboron-10arealdensitysuchthatsubcriticalityismaintaineddependingonthedesignspecificationfortheservicelifeintheoperatingenvironmentofanuclearspentfuelpool.1.5Observanceofthisspecificationdoesnotrelievetheuseroftheobligationtoconformtoallapplicableinternational,national,andlocalregulations.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C859TerminologyRelatingtoNuclearMaterialsC1187GuideforEstablishingSurveillanceTestProgramforBoron-BasedNeutronAbsorbingMaterialSystemsforUseinNuclearFuelStorageRacksInaPoolEnvironmentE105PracticeforProbabilitySamplingofMaterialsE2971Tes...
