1、Designation:C78508(Reapproved 2015)Standard Specification forNuclear-Grade Aluminum Oxide Pellets1This standard is issued under the fixed designation C785;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A nu
2、mber in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification applies to pellets of aluminum oxidethat may be ultimately used in a reactor core,for example,asfiller or spacers within f
3、uel,burnable poison,or control rods.Inorder to distinguish between the subject pellets and“burnablepoison”pellets,it is established that the subject pellets are notintended to be used as neutron-absorbing material.1.2 The values stated in inch-pound units are to be regardedas standard.The values giv
4、en in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2.Referenced Documents2.1 ASTM Standards:2C559 Test Method for Bulk Density by Physical Measure-ments of Manufactured Carbon and Graphite ArticlesC809 Test Methods for Chem
5、ical,Mass Spectrometric,andSpectrochemical Analysis of Nuclear-Grade AluminumOxide and AluminumOxide-Boron Carbide CompositePelletsC859 Terminology Relating to Nuclear MaterialsC1233 Practice for Determining Equivalent Boron Contentsof Nuclear MaterialsE105 Practice for Probability Sampling of Mater
6、ials2.2 ANSI Standard:ANSI/ASME NQA-1 Quality Assurance Requirements forNuclear Facility Applications32.3 U.S.Government Document:Code of Federal Regulations,Title 10,Part 50,Energy(10CFR50)Domestic Licensing of Production and Utili-zation Facilities43.Terminology3.1 DefinitionsTerms shall be define
7、d in accordance withTerminology C859 except for the following:3.2 Definitions of Terms Specific to This Standard:3.2.1 buyerorganization issuing the purchase order.3.2.2 pelletfabricated geometric shape of aluminum oxidehaving a chemical composition as described in Section 4.3.2.3 pellet lotthat qua
8、ntity of pellets produced from onealuminum oxide powder lot using one set of process param-eters whose limits have been agreed upon between the sellerand the buyer.3.2.4 powder lota specified quantity of aluminum oxidepowder made up of powders from one or more sources,blended together such that samp
9、les taken in accordance with7.1 can be considered as representative of the entire specifiedquantity.3.2.5 selleraluminum oxide pellet supplier.4.Chemical Composition4.1 Use analytical chemistry methods in accordance withMethods C809 or alternate methods agreed upon between thebuyer and the seller.4.
10、2 The finished aluminum oxide pellets shall conform tothe following chemical analysis:B2O3+boric acid0.01 weight%maxSi2.0 weight%maxFe+Cr+Ni0.6 weight%maxMg1.0 weight%maxNa0.2 weight%maxCa0.3 weight%maxHf200 g/g pellet maxF50 g/g pellet maxF+Cl+I+Br100 g/g pellet max1This specification is under the
11、jurisdiction of ASTM Committee C26 onNuclear Fuel Cycle and is the direct responsibility of Subcommittee C26.03 onNeutron Absorber Materials Specifications.Current edition approved Jan.1,2015.Published January 2015.Originallyapproved in 1976.Last previous edition approved in 2008 as C785 08.DOI:10.1
12、520/C0785-08R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Instit
13、ute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Consho
14、hocken,PA 19428-2959.United States1 Any element impurity not listed in 4.2 shall not exceed 1weight%as determined by emission spectroscopy.The sum ofall impurities shall not exceed 4.0 weight%.4.2.1 The total equivalent boron content(EBC)of thefinished aluminum oxide pellets shall not exceed 400 mg/
15、g ona pellet weight basis.The total EBC is the sum of the individualEBC values.Practice C1233 contains a list of elements to beconsidered in calculating the total EBC.The EBC of eachimpurity element shall be calculated individually using thefollowing equation:EBC of impurity5EBC factor!3mg of impuri
16、ty/g pellet!(1)4.2.2 Should the EBC of additional elements not listedPractice C1233 be of concern,their inclusion in the summationand their respective EBC factors must be mutually agreed uponby the buyer and the seller.4.2.3 The hydrogen impurity(including moisture)level,detailed procedure for measuring hydrogen,and packagingrequirements associated with hydrogen contamination,shall beagreed upon between the buyer and the seller.5.Physical Properties5.1 Physical Dimensions:5.1.1 Dimensional requi
