ASTM_C_996_-_15.pdf

Designation:C99615Standard Specification forUranium Hexafluoride Enriched to Less Than 5%235U1This standard is issued under the fixed designation C996;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year 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.Scope1.1 This specification covers nuclear grade uraniumhexafluoride(UF6)that either has been processed through anenrichment plant,or has been produced by the blending ofHighly Enriched Uranium with other uranium to obtain ura-nium of any235U concentration below 5%and that is intendedfor fuel fabrication.The objectives of this specification aretwofold:(1)To define the impurity and uranium isotope limitsfor Enriched Commercial Grade UF6so that,with respect tofuel design and manufacture,it is essentially equivalent toenriched uranium made from natural UF6;and(2)To definelimits for Enriched Reprocessed UF6to be expected if Repro-cessed UF6is to be enriched without dilution with CommercialNatural UF6.For such UF6,special provisions,not definedherein,may be needed to ensure fuel performance and toprotect the work force,process equipment,and the environ-ment.1.2 This specification is intended to provide the nuclearindustry with a standard for enriched UF6that is to be used inthe production of sinterable UO2powder for fuel fabrication.In addition to this specification,the parties concerned mayagree to other appropriate conditions.1.3 The scope of this specification does not comprehen-sively cover all provisions for preventing criticality accidentsor requirements for health and safety or for shipping.Obser-vance of this specification does not relieve the user of theobligation to conform to all applicable international,federal,state,and local regulations for processing,shipping,or in anyother way using UF6(see,for example,TID-7016,DP-532,andDOE O474.1).1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.2.Referenced Documents2.1 ASTM Standards:2C761 Test Methods for Chemical,Mass Spectrometric,Spectrochemical,Nuclear,and Radiochemical Analysis ofUranium HexafluorideC787 Specification for Uranium Hexafluoride for Enrich-mentC859 Terminology Relating to Nuclear MaterialsC1052 Practice for Bulk Sampling of Liquid UraniumHexafluorideC1703 PracticeforSamplingofGaseousUraniumHexafluorideE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 ANSI/ASME Standards:3ASME NQA-1 QualityAssurance Requirements for NuclearFacility ApplicationsANSI N14.1 Nuclear MaterialsUranium HexafluoridePackaging for Transport2.3 U.S.Government Documents:Inspection,Weighing,and Sampling of Uranium Hexafluo-ride Cylinders,Procedure for Handling and Analysis ofUranium Hexafluoride,Vol.1,DOE Report ORO-671-1,latest revision4Nuclear Safety Guide,U.S.NRC Report TID-7016,Rev.2,1978Clarke,H.K.,Handbook of Nuclear Safety,DOE ReportDP-5324Code of Federal Regulations,Title 10,Part 50,(AppendixB)41This specification is under the jurisdiction of ASTM Committee C26 onNuclear Fuel Cycle and is the direct responsibility of Subcommittee C26.02 on Fueland Fertile Material Specifications.Current edition approved July 1,2015.Published July 2015.Originally approvedin 1983.Last previous edition approved in 2010 as C996 10.DOI:10.1520/C0996-15.2For 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 Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036.4Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 2.4 Other Document:The UF6Manual:Good Handling Practices for UraniumHexafluoride,United States Enrichment Corporation Re-port USEC-651,latest revision53.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 Terms shall be defined in accordance with Terminol-ogy C859 except for the following:3.1.2 Commercial Natural UF6UF6from natural unirra-diated uranium(containing 0.711 6 0.004 g235U per 100 g U).3.1.2.1 DiscussionIt is recognized that some contamina-tion with reprocessed uranium may occur during routineprocessing.This is acceptable provided that the UF6meets therequirements for Commercial Natural UF6as specified inSpecification C787.3.1.3 Reprocessed UF6any UF6made from uranium thathas been exposed in a neutron irradiation facility and subse-quently chemically separated from the fission products andtransuranic isotopes so generated.3.1.4 Highly Enriched Uraniumany form of uraniumhaving a235U