1、Designation: C 1462 00 (Reapproved 2008)Standard Specification forUranium Metal Enriched to More than 15 % and Less Than20 %235U1This standard is issued under the fixed designation C 1462; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revi
2、sion, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers nuclear grade uranium metalthat has either been processed through an enri
3、chment plant, orhas been produced by the blending of highly enriched uraniumwith other uranium, to obtain uranium of any235U concentra-tion below 20 % (and greater than 15 %) and that is intendedfor research reactor fuel fabrication. The scope of this speci-fication includes specifications for enric
4、hed uranium metalderived from commercial natural uranium, recovered uranium,or highly enriched uranium. Commercial natural uranium,recovered uranium and highly enriched uranium are defined inSection 3. The objectives of this specification are to define theimpurity and uranium isotope limits for comm
5、ercial gradeenriched uranium metal.1.2 This specification is intended to provide the nuclearindustry with a standard for enriched uranium metal which is tobe used in the production of research reactor fuel. In additionto this specification, the parties concerned may agree to otherappropriate conditi
6、ons.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 standard does not relieve the user of theobligation to conform to all applicable international, federa
7、l,state, and local regulations for processing, shipping, or anyother way of using uranium metal (see, for example, C 996regarding references).2. Referenced Documents2.1 ASTM Standards:2C 696 Test Methods for Chemical, Mass Spectrometric, andSpectrochemical Analysis of Nuclear-Grade Uranium Di-oxide
8、Powders and PelletsC 799 Test Methods for Chemical, Mass Spectrometric,Spectrochemical, Nuclear, and Radiochemical Analysis ofNuclear-Grade Uranyl Nitrate SolutionsC 859 Terminology Relating to Nuclear Materials3C 996 Specification for Uranium Hexafluoride Enriched toLess Than 5 %235UC 1233 Practice
9、 for Determining Equivalent Boron Con-tents of Nuclear MaterialsC 1295 Test Method for Gamma Energy Emission fromFission Products in Uranium Hexafluoride and UranylNitrate SolutionC 1347 Practice for Preparation and Dissolution of UraniumMaterials for Analysis2.2 ANSI Standard4ANSI-ASME NQA-1 Qualit
10、y Assurance Program Require-ments for Nuclear Facility Applications2.3 U.S. Government Documents5Code of Federal Regulations, Title 10, Part 50, (AppendixB)3. Terminology3.1 Definitions of Terms Specific to This StandardTermsshall be defined in accordance with Terminology C 859, exceptfor the follow
11、ing:3.1.1 commercial grade enriched uranium metaluraniummetal derived from commercial natural uranium, recovereduranium, or uranium obtained from the blending of highlyenriched uranium with commercial natural uranium, recovereduranium, or depleted uranium.3.1.2 commercial natural uraniumany form of
12、naturalunirradiated uranium (containing 0.711 + 0.004 g235U per 100g U).3.1.3 depleted uraniumany form of unirradiated uraniumwith a235U content less than commercial natural uranium.3.1.4 highly enriched uraniumany form of uranium hav-ing a235U content equal to or in excess of 20 %.3.1.5 recovered u
13、raniumany form of uranium that hasbeen exposed in a neutron irradiation facility and either has1This 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 a
14、pproved Jan. 1, 2008. Published February 2008. Originallyapproved in 2000. Last previous edition approved in 2005 as C 1462 00 (2005).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume info
15、rmation, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.5Available from U.S. Government Printing Office Superintendent of Documents,732 N. Capito
16、l St., NW, Mail Stop: SDE, Washington, DC 20401, http:/www.access.gpo.gov.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Copyright by ASTM Intl (all rights reserved); Wed Nov 5 02:30:44 EST 2008Downloaded/printed byGuo Dehua (CNIS)
17、pursuant to License Agreement. No further reproductions authorized.been subsequently chemically separated from the fission prod-ucts and transuranic isotopes so generated, or may be used asis, due to low irradiation levels.3.1.5.1 DiscussionThe requirements for recovered ura-nium are intended to be
18、typical of reprocessed spent fuel fromresearch reactors that have achieved burn-up levels of up to50 % of the originally contained fissile material or may havebeen utilized in critical facilities. It is recognized that differentlimits would be necessary to accommodate different fuelhistories.3.1.6 F
19、or enriched uranium metal transactions, “buyer”usually represents the research reactor operator or the fuelfabricator, and “seller” usually represents the supplier of theenriched uranium metal.4. Health Physics Requirements4.1 For commercial grade enriched uranium metal, thegamma activity from fissi
20、on products shall not exceed 600Bq/gU. The measurements are to be made by Test MethodC 1295 or equivalent. See Note 1.NOTE 1Depending upon the requirements of the fabricator utilizingenriched uranium metal, gamma activity from fission products as high as6,000 Bq/gU may be acceptable, due to the util
21、ization of reprocessedenriched uranium in producing the enriched uranium metal.4.2 For commercial grade enriched uranium metal, the totalalpha activity from transuranium elements shall be less than250 Bq/gU.5. Chemical, Physical, and Isotopic Requirements5.1 Physical Requirements:5.1.1 The uranium c
22、ontent of commercial grade enricheduranium metal shall be greater than or equal to 99.85 weightpercent.5.1.2 The product shall be supplied as spherical, cubical,cylindrical or broken pieces, with dimensions of not more than40 mm or less than 10 mm. The mass of individual pieces shallbe between 130 a
23、nd 300 g.5.1.3 The individual pieces of product shall be free of looseor excessive oxides or contaminants. A tightly adhering oxidefilm is allowable.5.1.4 The following impurity elements shall not exceedthese values:Element g/gU Element g/gUAluminum Al 150 Magnesium Mg 50Boron B 1 Manganese Mn 50Ber
24、yllium Be 10 Molybdenum Mo 100Carbon C 800 Nickel Ni 100Calcium Ca 100 Phosphorus P 100Cadmium Cd 1 Silicon Si 250Chromium Cr 50 Sodium Na 25Cobalt Co 10 Tin Sn 100Copper Cu 50 Vanadium V 30Iron Fe 250 Tungsten W 100Lead Pb 10 Zirconium Zr 250Lithium Li 10Rare Earths (Dy, Eu, Gd, Sm) 3.0The sum of t
25、he impurity elements shall not exceed 1500g/gU.5.1.5 Equivalent Boron ContentFor research reactor use,the total equivalent boron content (EBC) shall not exceed 4.0g/gU. The list of elements to be considered for the EBCcalculation shall be agreed upon between the buyer and theseller. The method of pe
26、rforming the calculation and the EBCFactors shall be as indicated in Practice C 1233. For fastreactor use, the above limitation on total EBC does not apply.5.2 Isotopic Requirements:5.2.1 The following limits for commercial grade enricheduranium metal shall not be exceeded:232U 0.002 g/gU234U 0.01 g
27、/gU236U 0.04 g/gU5.2.2 Uranium isotopic concentrations shall be determinedand reported for232U,234U,235U, and236U. The allowablevariation for235U shall be 6 0.20 weight percent absolute fromthe nominal235U assay.6. Sampling6.1 A representative sample of sufficient size to performtests prescribed sha
28、ll be taken from each lot. The size of a lotshall be as agreed upon between seller and buyer and shall befrom a single melt. Typically, a lot shall not be greater than 10kg.6.2 All samples shall be clearly identified including thesellers lot number.6.3 All containers used for a lot shall be positive
29、ly identifiedas containing material from a particular lot.6.4 ASTM standard practice for preparation of uraniummaterials (Practice C 1347), or demonstrated equivalent shallbe used as mutually agreed upon between the buyer and seller.7. Test Methods for Chemical and Isotopic Analysis7.1 ASTM test met
30、hods for chemical and isotopic analysis(Test Methods C 696 or C 799), or demonstrated equivalent,shall be used as mutually agreed upon between the buyer andseller.8. Packaging, Handling, and Shipping8.1 Procedures for packaging, handling, and shipping com-mercial grade enriched uranium metal are as
31、agreed betweenbuyer and seller and shall be in accordance with applicablenational or international procedures.9. Quality Assurance9.1 Quality assurance requirements shall be agreed uponbetween the buyer and the seller when specified in the purchaseorder. Code of Federal Regulations, Title 10, Part 5
32、0 (Appen-dix B) and NQA-1 are referenced as guides.10. Keywords10.1 medium enriched uranium; nuclear fuel; research reac-tor fuel; uranium metalC 1462 00 (2008)2Copyright by ASTM Intl (all rights reserved); Wed Nov 5 02:30:44 EST 2008Downloaded/printed byGuo Dehua (CNIS) pursuant to License Agreemen
33、t. No further reproductions authorized.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the
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36、ke your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained
37、by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C 1462 00 (2008)3Copyright by ASTM Intl (all rights reserved); Wed Nov 5 02:30:44 EST 2008Downloaded/printed byGuo Dehua (CNIS) pursuant to License Agreement. No further reproductions authorized.
