ASTM_C_1689_-_08a_2014.pdf

Designation:C168908a(Reapproved 2014)Standard Practice forSubsampling of Uranium Hexafluoride1This standard is issued under the fixed designation C1689;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 practice is applicable to subsampling uraniumhexafluoride(UF6),using heat liquefaction techniques,frombulk containers,obtained in conformance with C1052,intosmaller sample containers,which are required for laboratoryanalyses.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 It is assumed that the liquid UF6being sampled com-prises a single quality and quantity of material.This practicedoes not address any special additional arrangement that mightbe required for taking proportional or composite samples.1.4 The number of samples to be taken,their nominalsample weight,and their disposition shall be agreed uponbetween the parties.1.5 The scope of this practice does not include provisionsfor preventing criticality incidents.1.6 This standard does not purport to address 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 Specification for Uranium Hexafluoride for Enrich-mentC859 Terminology Relating to Nuclear MaterialsC996 Specification for Uranium Hexafluoride Enriched toLess Than 5%235UC761 Test Methods for Chemical,Mass Spectrometric,Spectrochemical,Nuclear,and Radiochemical Analysis ofUranium HexafluorideC1052 Practice for Bulk Sampling of Liquid UraniumHexafluoride2.2 Other Documents:ANSI N14.1 Uranium Hexafluoride:Packaging for Trans-port3ISO/DIS 7195 Packaging of Uranium Hexafluoride(UF6)for Transport4USEC-651 The UF6Manual:Good Handling Practices forUranium Hexafluoride,latest revision53.Terminology3.1 Terms shall be defined in accordance with TerminologyC859 except for the following:3.1.1 sample bottlethe vessel(typically a 1S or 2S bottle)into which the sample of UF6is withdrawn from the containerfor transfer to the laboratory,analysis or dispatch to thecustomer.3.1.2 subsample tubethe small vessel(for example,a P10tube6)into which a subsample of UF6is withdrawn from thesample bottle for analysis of UF6quality or dispatch to thecustomer.3.1.3 subsample rigthe equipment to perform the transferof liquid UF6from the sample bottle into the subsample tube,typically a vacuum manifold equipped with heating and aliquid nitrogen trap.4.Summary of Practice4.1 Two methods of withdrawing a subsample of UF6aredescribed which differ based on safety requirements namely:1This practice is under the jurisdiction of ASTM Committee C26 on NuclearFuel Cycle and is the direct responsibility of Subcommittee C26.05 on Methods ofTest.Current edition approved Jan.1,2014.Published February 2014.Originallyapproved in 2008.Last previous edition approved in 2008 as C1689 08a.DOI:10.1520/C1689-08aR14.2For 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,http:/www.ansi.org.4Available from International Organization for Standardization(ISO),1,ch.dela Voie-Creuse,Case postale 56,CH-1211,Geneva 20,Switzerland,http:/www.iso.ch.5Available from United States Enrichment Corp.,6903 Rockledge Dr.,Bethesda,MD 20817,http:/.6Polychlorotrifluoroethylene P10 tubes are widely accepted by the industry forsubsample collection and subsequent UF6quality analyses or dispatch to thecustomer.Other types of subsample tubes,for example P-20,P-80 or P100,can beused for internal subsample collection and processing.Dispatch of these subsampletubes may be agreed upon by buyer and seller and subject to(local)transportregulations.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1(1)homogenizing of liquefied UF6by agitation before liquidtransfer and(2)homogenizing of liquefied UF6by convectionbefore liquid transfer.The first method involves homogeniza-tion of liquified UF6in a sample bottle by vigorous shaking.Subsequently the sample bottle is inverted and connected to thetop of a heated vacuum-manifold system,and the subsampletube is attached to the appropriate port of the system.Thesystem is evacuated and the liquid UF6allowed to flow bygravity into the subsample tube.In the second method thesample bottle containing solid UF6is connected to the top of amanifold system,and a