1、Designation: C 888 03Standard 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 last revision. A nu
2、mber 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 provides the chemical and physicalrequirements for nuclear-grade gadolinium oxide powder in-tended for subsequent pro
3、cessing 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 federal, state, and loc
4、al regulations pertaining topossessing, shipping, processing, or using this material.2. Referenced Documents2.1 ASTM Standards:B 329 Test Method for Apparent Density of Powders ofRefractory Metals and Compounds by the Scott Volume-ter2C 493 Test Method for Bulk Density and Porosity of Granu-lar Refr
5、actory Materials by Mercury Displacement3C 859 Terminology Relating to Nuclear Materials4C 889 Test Methods for Chemical and Mass SpectrographicAnalysis of Nuclear-Grade Gadolinium Oxide (Gd2O3)Powder4E 11 Specification for Wire-Cloth Sieves for Testing Pur-poses5E 105 Practice for Probability Sampl
6、ing of Materials52.2 ANSI Standard:ANSI/ASME NQA-1 Quality Assurance Requirements forNuclear Facility Applications62.3 U.S. Government Document:Code of Federal Regulations, Title 10, Part 50Energy (10CFR 50), Domestic Licensing of Production and Utiliza-tion Facilities73. Terminology3.1 Definitions
7、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 organization 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 i
8、naccordance 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. Ordering Information4.1 The buyer shall specify the following information for allorders where this specification applies:4.1.1 Powder lot size (all
9、owable range),4.1.2 Quantity (weight of delivered product),4.1.3 Nominal particle size range and applicable tolerancesin accordance with Specification E 11,4.1.4 Density (optional), Scott Volumeter (Test MethodB 329) and Mercury Displacement (Test Method C 493) arereferenced as guides to density mea
10、surement 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 Quality requirements.5. Chemical Composition5.1 Loss-on-Ignition The loss-on-ignition as determinedafter ignition for2hataminimum temperature of 900C
11、 shallnot exceed 1.5 weight %.5.2 Gadolinium Oxide ConcentrationThe minimumGd2O3concentration shall be 99.8 weight % exclusive of theconstituents lost on ignition as determined by Test MethodsC 889.1This specification is under the jurisdiction of ASTM Committee C26 onNuclear Fuel Cycle and is the di
12、rect responsibility of Subcommittee C26.03 onNeutron Absorber Materials Specifications.Current edition approved Feb.10, 2003. Published February 2003. Originallyapproved in 1978. Last previous edition approved in 1997 as C 888 97.2Annual Book of ASTM Standards, Vol 02.05.3Annual Book of ASTM Standar
13、ds, Vol 15.01.4Annual Book of ASTM Standards, Vol 12.01.5Annual Book of ASTM Standards, Vol 14.02.6Available from the American National Standards Institute, 11 W. 42nd St., 13thFloor, New York, NY 10036.7Available from Superintendent of Documents, U.S. Government PrintingOffice, Washington, DC 20402
14、.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2.1 Gadolinium Oxide Isotope ConcentrationThe isoto-pic concentration of the gadolinium shall be that which isfound in naturally occurring gadolinium for the followingisotopes:Isotop
15、e 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.ElementMaximumConcentration(g/g Gd2O3)Boron 5Cadmium 25Thorium 30(Chlorine + fluorine) 100(Europium +
16、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 Gd2O3shall be reported. The total of allmeasured impurities shall not exceed 2000 g/g Gd2O3.6. Physical Prope
17、rties6.1 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 precludes contamination by dust, organics, plastics, orother foreign materials.8. Sampling8.1 Sampling pl
18、ans 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 not specified in thisdocument varies with the application and therefore should bespecified on the purch
19、ase 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 verification tests by the seller,8.2.2 Acceptance tests by the buyer,8.2.3 Referee tests, in the event
20、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. Inspection and Certification9.1 The seller shall inspect the material covered by thisspecification a
21、nd 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 concurrent with the shipment of the powder lot.10. Rejection and Rehearing10.1 Unless the buyer and s
22、eller 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 maypetition the buyer to waive selected requirements for identifiedout-of-specification lots. The decision to
23、 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 over the results ofchemical analyses, samples shall be submitted to a mutuallyselected referee for resol
24、ution.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. The exact sizeand type of packaging shall be as mutually agreed upon by thebuyer and the seller.11.2
25、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 order number,11.2.4 Powder lot number,11.2.5 Gross, net, and tare weights,11.2.6 Name of seller, and11
26、.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 and seller when specified in the purchaseorder. CFR Title 10, Part 50, Appendix B, and ANSI/ASMENQA-1 a
27、re referenced as guides.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 riskof infringe
28、ment 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 reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard o
29、r for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views k
30、nown 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 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).C888032
