1、Designation:D721919An American National StandardStandard Specification forIsotropic and Near-isotropic Nuclear Graphites1This standard is issued under the fixed designation D7219;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the ye
2、ar of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers the classification,processing,and typical properties of as-manufactured nuclear grade grap
3、h-ite billets with dimensions sufficient to meet the designersrequirements for fuel elements,moderator or reflector blocks,in a high temperature reactor.The graphite classes specifiedhere may be suitable for reactor core applications wheredimensional change due to fast neutron irradiation has asigni
4、ficant impact on design,provided they meet the require-ments of the ASME code.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.(See IEEE/ASTM SI 10.)1.3 This standard does not purport to address all of thesafety concerns,if an
5、y,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally
6、 recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C559 Test Method fo
7、r Bulk Density by Physical Measure-ments of Manufactured Carbon and Graphite ArticlesC781 Practice for Testing Graphite Materials for Gas-CooledNuclear Reactor ComponentsC838 Test Method for Bulk Density of As-ManufacturedCarbon and Graphite ShapesC1233 Practice for Determining Equivalent Boron Cont
8、entsof Nuclear MaterialsD346 Practice for Collection and Preparation of CokeSamples for Laboratory AnalysisD2638 Test Method for Real Density of Calcined PetroleumCoke by Helium PycnometerD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsIEEE/ASTM SI 10 American National Sta
9、ndard for Use ofthe International System of Units(SI):The Modern MetricSystem2.2 ASME Standard:NQA-1 Quality Assurance Program Requirements forNuclear Facilities,Sec III Div 5 Sub Sect HH sub-part A:Graphite Materials(HHA)33.Terminology3.1 DefinitionsDefinitions relating to this specification aregiv
10、en in Terminology D4175.3.2 Definitions of Terms Specific to This Standard:3.2.1 baking/re-baking charge,nin carbon and graphitetechnology,number of billets in a baking/re-baking furnacerun.3.2.2 bulk density,nin carbon and graphite technology,mass of a unit volume of material including both permeab
11、leand impermeable voids.3.2.3 extrusion forming lot,nin carbon and graphitetechnology,number of billets of the same size extruded in anuninterrupted sequence.3.2.4 grain,nin manufactured carbon and graphite,par-ticle of filler material(usually coke or graphite)in the startingmix formulation;also ref
12、erred to as granular material,fillerparticle,or aggregate material;the term is also used to describethe general texture of a carbon or graphite body,as in thedescriptions listed below:3.2.4.1 coarse grained,adjcontaining grains in the start-ing mix that are substantially greater than 4 mm in size.3.
13、2.4.2 medium coarse grained,adjcontaining grains inthe starting mix that are generally less than 4 mm in size.1This specification is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.F0 on Manufactured Ca
14、rbon and Graphite Products.Current edition approved Nov.1,2019.Published November 2019.Originallyapproved in 2005.Last previous edition approved in 2014 as D7219 08(2014).DOI:10.1520/D7219-19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at servic
15、eastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Two Park Ave.,New York,NY 10016-5990.*A Summary of Changes section appears at th
16、e end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.2.4.3 medium grained,adjcontaining grains in the sta