1、Designation:C105214Standard Practice forBulk Sampling of Liquid Uranium Hexafluoride1This standard is issued under the fixed designation C1052;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 pare
2、ntheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers methods for withdrawing represen-tative samples of liquid uranium hexafluoride(UF6)from bulkquantities of the material.Such samples
3、are used for determin-ing compliance with the applicable commercial specification,for example Specification C787 and Specification C996.1.2 It is assumed that the bulk liquid UF6being sampledcomprises a single quality and quantity of material.Thispractice does not address any special additional arra
4、ngementsthat might be required for taking proportional or compositesamples.When the sampled bulk material is being added toUF6residues already in a container(“heels recycle”)additionalarrangements are required to avoid cross contamination of thebulk UF6,these are addressed in the appropriate section
5、(8.2)of Specifications C787 and C996.1.3 The number of samples to be taken,their nominalsample weight,and their disposition shall be agreed uponbetween the parties.1.4 The scope of this practice does not include provisionsfor preventing criticality incidents.1.5 This standard does not purport to add
6、ress all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C787 Specificatio
7、n for Uranium Hexafluoride for Enrich-mentC996 Specification for Uranium Hexafluoride Enriched toLess Than 5%235U2.2 Other Documents:USEC-651 Uranium Hexafluoride:A Manual of Good Han-dling Practices3ANSI N14.1 Uranium Hexafluoride:Packaging for Trans-port4ISO/DIS 7195 Packaging of Uranium Hexafluor
8、ide(UF6)for Transport43.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 containerthe bulk vessel either holding or receivingby transfer,the UF6to be sampled;it may consist of,forexample,a fixed vessel in a UF6handling plant or a cylinder tobe used for the transport of UF6.3.1.2 s
9、ample bottlethe small vessel into which the sampleof UF6is withdrawn for transfer to the laboratory for charac-terization.4.Summary of Practice4.1 Two methods of withdrawing a sample are described,namely:(1)direct withdrawal from a filled container and(2)withdrawal from the inlet-line during the fil
10、ling of a containerby liquid transfer.The first method involves tilting or turningthe container in such a way that its valve is below the surfaceof the liquefied UF6,and dependent on the equipment,thisrequires that the container holds more than a specified mini-mum quantity of UF6.Liquid UF6is withd
11、rawn into agraduated volume and then transferred to the respective samplebottle(s).In the second method,a small proportion of the UF6flowing from one container to another is withdrawn into agraduated volume and then transferred to the respective samplebottle(s).4.2 For both methods of sampling,the p
12、resence of residuesmay have significant implications for the quality of the UF6.For safety and quality reasons,containers and bottles shall beclean,dry,and empty before filling.4.3 Various types of sample bottles are in use and aredescribed in detail in the applicable national and international1This
13、 practice is under the jurisdiction of ASTM Committee C26 on NuclearFuel Cycle and is the direct responsibility of Subcommittee C26.02 on Fuel andFertile Material Specifications.Current edition approved Jan.15,2014.Published February 2014.Originallyapproved in 1985.Last previous edition approved in
14、2007 as C1052 01(2007).DOI:10.1520/C1052-14.2For 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 United
15、 States Enrichment Corp.,6903 Rockledge Dr.,Bethesda,MD 20817.4Available from American National Standards Institute,11 W.42nd St.,13thFloor,New York,NY 10036.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 standards,for example,ANSI N14.1
16、 and ISO/DIS 7195.For agiven type of sample bottle,the detailed configuration,forexample,valve orientation,terminal fittings,and the like,mayvary.Hence,the type and configuration of bottles to be used forthe withdrawal of samples shall be agreed upon between theparties.5.Significance and Use5.1 Uranium hexafluoride is normally produced and handledin large(typically 1-to 20-ton)quantities and must,therefore,be characterized by reference to representative samples.Thequantities involved,physical pr