1、Designation: C 888 03 (Reapproved 2008)Standard Specification forNuclear-Grade Gadolinium Oxide (Gd2O3) Powder1This standard is issued under the fixed designation C 888; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of l
2、ast 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 provides the chemical and physicalrequirements for nuclear-grade gadolinium oxide powder in-tended f
3、or subsequent processing and use in nuclear fuelapplications, for example, as an addition to uranium dioxide.1.2 This specification does not include requirements forhealth and safety. Observance of this specification does notrelieve the user of the obligation to be aware of and complywith all federa
4、l, state, and local regulations pertaining topossessing, shipping, processing, or using this material.1.3 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.2. Referenced Documents2.1 ASTM Standards:2B 329 Test Method for Apparent
5、Density of Metal Powdersand Compounds Using the Scott VolumeterC 493 Test Method for Bulk Density and Porosity of Granu-lar Refractory Materials by Mercury Displacement (Dis-continued 2002)3C 859 Terminology Relating to Nuclear MaterialsC 889 Test Methods for Chemical and Mass SpectrometricAnalysis
6、of Nuclear-Grade Gadolinium Oxide (Gd2O3)PowderE11 Specification for Wire Cloth and Sieves for TestingPurposesE 105 Practice for Probability Sampling Of Materials2.2 ANSI Standard:ANSI/ASME NQA-1 Quality Assurance Requirements forNuclear Facility Applications42.3 U.S. Government Document:Code of Fed
7、eral Regulations, Title 10, Part 50 Energy (10CFR 50), Domestic Licensing of Production and Utiliza-tion Facilities53. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 Terms shall be defined in accordance with Terminol-ogy C 859 except as defined herein.3.1.1.1 buyerthe organizati
8、on issuing the purchase order.3.1.1.2 powder lota quantity of gadolinium oxide powderthat has been processed in a manner such that samples taken inaccordance with the procedures of 8.1 can be considered asrepresentative of the entire powder lot.3.1.1.3 sellerthe gadolinium oxide powder supplier.4. O
9、rdering Information4.1 The buyer shall specify the following information for allorders where this specification applies:4.1.1 Powder lot size (allowable range),4.1.2 Quantity (weight of delivered product),4.1.3 Nominal particle size range and applicable tolerancesin accordance with Specification E11
10、,4.1.4 Density (optional), Scott Volumeter (Test MethodB 329) and Mercury Displacement (Test Method C 493) arereferenced as guides to density measurement techniques,4.1.5 Shape factor and method of determination (optional),4.1.6 Sampling requirements,4.1.7 Crystal structure (optional), and4.1.8 Qual
11、ity requirements.5. Chemical Composition5.1 Loss-on-IgnitionThe loss-on-ignition as determinedafter ignition for 2 h at a minimum temperature of 900C shallnot exceed 1.5 weight %.1This specification is under the jurisdiction of ASTM Committee C26 onNuclear Fuel Cycle and is the direct responsibility
12、 of Subcommittee C26.03 onNeutron Absorber Materials Specifications.Current edition approved Dec. 1, 2008. Published January 2009. Originallyapproved in 1978. Last previous edition approved in 2003 as C 888 03.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Custo
13、mer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.4Available from American National Standards Institute (A
14、NSI), 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. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http:/www.access.gpo.gov.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700,
15、 West Conshohocken, PA 19428-2959, United States.5.2 Gadolinium Oxide ConcentrationThe minimumGd2O3concentration shall be 99.8 weight % exclusive of theconstituents lost on ignition as determined by Test MethodsC 889.5.2.1 Gadolinium Oxide Isotope ConcentrationThe isoto-pic concentration of the gado
16、linium shall be that which isfound in naturally occurring gadolinium for the followingisotopes:Isotope Atomic %155Gd 14.9 6 1.0157Gd 15.7 6 1.05.3 Impurity Content:5.3.1 Individual Impurity LimitsIndividual impurities ex-clusive of constituents lost on ignition shall not exceed thefollowing limits:E
17、lementMaximumConcentration(g/g Gd2O3)Boron 5Cadmium 25Thorium 30(Chlorine + fluorine) 100(Europium + samarium + terbium + ytterbium +dysprosium)1000Carbon 6005.3.2 The buyer may specify individual impurity limits forany elements not listed in 5.3.1. Any identified impurityexceeding 1000 g/g Gd2O3sha
18、ll be reported. The total of allmeasured impurities shall not exceed 2000 g/g Gd2O3.6. Physical Properties6.1 Physical properties listed in 4.1.3, 4.1.4, 4.1.5, and 4.1.7shall be in compliance with the buyers requirements.7. Cleanliness7.1 The lot shall be processed and packaged in a mannerthat prec
19、ludes contamination by dust, organics, plastics, orother foreign materials.8. Sampling8.1 Sampling plans to meet acceptance criteria and inspec-tion and measurement procedures that describe the method ofcompliance with this specification shall be approved by thebuyer. The degree of sampling where no
20、t specified in thisdocument varies with the application and therefore should bespecified on the purchase order. Recommended Practice E 105is referenced as a guide.8.2 Each sample taken shall be sufficient to perform thefollowing in the event they are necessary or desired by thebuyer:8.2.1 Quality ve
21、rification tests by the seller,8.2.2 Acceptance tests by the buyer,8.2.3 Referee tests, in the event these become necessary, and8.2.4 Retention of archive samples by the seller.8.3 Archive samples shall be retained for a period of timespecified by the buyer and delivered to the buyer upon request.9.
22、 Inspection and Certification9.1 The seller shall inspect the material covered by thisspecification and shall provide the buyer with certificates oftests showing the results of all testing and inspection performedon each lot.9.2 The seller shall deliver all test certificates to the buyerprior to or
23、concurrent with the shipment of the powder lot.10. Rejection and Rehearing10.1 Unless the buyer and seller agree otherwise, rejectionand acceptance shall be on a lot basis.10.2 Powder lots that fail to conform to the requirements ofthis specification may be rejected by the buyer. The seller maypetit
24、ion the buyer to waive selected requirements for identifiedout-of-specification lots. The decision to grant such waiverbelongs to the buyer. The seller shall obtain the buyersapproval, prior to use, of any remedy proposed to bringrejected lots into specification.10.3 In the event of disagreement ove
25、r the results ofchemical analyses, samples shall be submitted to a mutuallyselected referee for resolution.11. Packaging and Package Marking11.1 Gadolinium oxide powder shall be packaged in sealedcontainers to prevent loss, damage, or contamination of thepowder from airborne or container materials.
26、The exact sizeand type of packaging shall be as mutually agreed upon by thebuyer and the seller.11.2 Each container shall bear, as a minimum, a label on thelid and side with the following information:11.2.1 Material in container (gadolinium oxide powder),11.2.2 Specification number,11.2.3 Purchase o
27、rder number,11.2.4 Powder lot number,11.2.5 Gross, net, and tare weights,11.2.6 Name of seller, and11.2.7 Container, numbered to identify individual containerand total quantity of containers in shipment.12. Quality Assurance12.1 Quality assurance requirements shall be agreed uponbetween the buyer an
28、d seller when specified in the purchaseorder. Code of Federal Regulations, Title 10, Part 50,AppendixB, and ANSI/ASME NQA-1 are referenced as guides.C 888 03 (2008)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this
29、 standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be
30、reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of therespo
31、nsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake 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, Wes
32、t Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained 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 888 03 (2008)3
