1、Designation:C183816Standard Practice forCleaning for 1S and 2S Bottles1This standard is issued under the fixed designation C1838;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 indica
2、tes the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice provides a description of the differentways to clean uranium hexafluoride(UF6)bottles.1.2 This practice describes two kinds of sample bottles:1Sand 2S bo
3、ttles.1.3 UnitsThe values stated in SI units are to be regardedas the standard.No other units of measurement are included inthis standard.1.4 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 est
4、ablish 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 He
5、xafluoride Enriched toLess Than 5%235U2.2 ANSI Standard:3N14.1 NuclearMaterialsUraniumHexafluoridePackaging for Transport3.Terminology3.1 DefinitionsDefinitions of terms are as given in Termi-nology C859.4.Significance and Use4.1 The uranium hexfluoride(UF6),as described in Speci-fications C787 and
6、C996,has to meet different requirements:one set of requirements being safety,health physics,andcriticality and the other set being chemical,physical,andisotopic.To ensure the UF6is in compliance with allrequirements,sampling and analysis shall be performed.Therefore,packaging may have a significant
7、impact on thequality of UF6.4.2 After sampling,the bottle will contain residues.There iscontamination because of the equipment,other contaminationcaused by nonvolatile elements,and isotopic contamination asa result of UF6hydrolysis.4.3 Cleaning shall be efficient.Special emphasis should begiven to d
8、econtaminate the bottles without leaving any trace ofcleaning products,make the bottles inert in UF6medium(passivation bottle),and minimize waste.The cleaning processshould be easy,safe,and environmentally friendly.4.4 This practice describes different protocols for cleaningbottles by gas and liquid
9、.5.Description of Sample Bottles5.1 Abottle is composed of a cylinder,adaptors,and a valve(see Fig.1).5.2 Adaptors are brazed or welded on the valve and screwedon the cylinder.5.3 Bottles and valves are made from nickel or nickel-copper alloy(for example,Monel).5.4 The design pressure and temperatur
10、e are indicated inANSI N14.1.6.Reagents6.1 Purity of ReagentsReagent-grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents conform to the specifications of the Committee onAnalytical Reagents of the American Chemical Society wheresuch specifications are
11、 available.4Other grades may be used,provided it is first ascertained that the reagent is of sufficiently1This 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 edit
12、ion approved April 1,2016.Published May 2016.DOI:10.1520/C183816.2For 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.3
13、Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents notlisted by the American Chemical Soc
14、iety,see Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.and the United States Pharmacopeia andNational Formulary,U.S.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 high
15、 purity to permit its use without lessening the effectivenessof the cleaning process.6.2 Chlorine Trifluoride(ClF3):6.2.1 CompositionSee Table 1.6.2.2 HazardsClF3is a highly reactive agent.With water,it forms hydrofluoric acid that penetrates the skin causingdestruction of deep tissue layers.It is v
16、ery corrosive and toxicby inhalation or contact.It is a powerful oxidizer that maintainsthe combustion and reacts violently with organic compounds.6.3 Fluorine Gas(F2):6.3.1 CompositionFluorine gas used is pure.6.3.2 HazardsFluorine gas is extremely corrosive andtoxic.The free element has a characteristic pungent odor and isdetectable in concentrations as low as 20 ppb,which is belowthe safe working level.Exposure to low concentrations causeseye and lung irritation.6.4 Mixture of Hydrofluoric Ac
