1、Designation: C785 08 (Reapproved 2015)Standard Specification forNuclear-Grade Aluminum Oxide Pellets1This standard is issued under the fixed designation C785; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. 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 applies to pellets of aluminum oxidethat may be ultimately used in a reactor core, for example, asfiller or spa
3、cers within fuel, burnable poison, or control rods. Inorder to distinguish between the subject pellets and “burnablepoison” pellets, it is established that the subject pellets are notintended to be used as neutron-absorbing material.1.2 The values stated in inch-pound units are to be regardedas stan
4、dard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2. Referenced Documents2.1 ASTM Standards:2C559 Test Method for Bulk Density by Physical Measure-ments of Manufactured Carbon and Graphite ArticlesC809
5、Test Methods for Chemical, Mass Spectrometric, andSpectrochemical Analysis of Nuclear-Grade AluminumOxide and AluminumOxide-Boron Carbide CompositePelletsC859 Terminology Relating to Nuclear MaterialsC1233 Practice for Determining Equivalent Boron Contentsof Nuclear MaterialsE105 Practice for Probab
6、ility Sampling of Materials2.2 ANSI Standard:ANSI/ASME NQA-1 Quality Assurance Requirements forNuclear Facility Applications32.3 U.S. Government Document:Code of Federal Regulations, Title 10, Part 50, Energy(10CFR50) Domestic Licensing of Production and Utili-zation Facilities43. Terminology3.1 Def
7、initionsTerms shall be defined in accordance withTerminology C859 except for the following:3.2 Definitions of Terms Specific to This Standard:3.2.1 buyerorganization issuing the purchase order.3.2.2 pelletfabricated geometric shape of aluminum oxidehaving a chemical composition as described in Secti
8、on 4.3.2.3 pellet lotthat quantity of pellets produced from onealuminum oxide powder lot using one set of process param-eters whose limits have been agreed upon between the sellerand the buyer.3.2.4 powder lota specified quantity of aluminum oxidepowder made up of powders from one or more sources,bl
9、ended together such that samples taken in accordance with7.1 can be considered as representative of the entire specifiedquantity.3.2.5 selleraluminum oxide pellet supplier.4. Chemical Composition4.1 Use analytical chemistry methods in accordance withMethods C809 or alternate methods agreed upon betw
10、een thebuyer and the seller.4.2 The finished aluminum oxide pellets shall conform tothe following chemical analysis:B2O3+ boric acid 0.01 weight % maxSi 2.0 weight % maxFe + Cr + Ni 0.6 weight % maxMg 1.0 weight % maxNa 0.2 weight % maxCa 0.3 weight % maxHf 200 g/g pellet maxF 50 g/g pellet maxF + C
11、l + I + Br 100 g/g pellet max1This specification is under the jurisdiction of ASTM Committee C26 onNuclear Fuel Cycle and is the direct responsibility of Subcommittee C26.03 onNeutron Absorber Materials Specifications.Current edition approved Jan. 1, 2015. Published January 2015. Originallyapproved
12、in 1976. Last previous edition approved in 2008 as C785 08. DOI:10.1520/C0785-08R15.2For 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 p
13、age 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 U.S. Government Printing Office Superintendent of Documents,732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http:/www.ac
14、cess.gpo.gov.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1Any element impurity not listed in 4.2 shall not exceed 1weight % as determined by emission spectroscopy. The sum ofall impurities shall not exceed 4.0 weight %.4.2.1 The to
15、tal equivalent boron content (EBC) of thefinished aluminum oxide pellets shall not exceed 400 mg/g ona pellet weight basis. The total EBC is the sum of the individualEBC values. Practice C1233 contains a list of elements to beconsidered in calculating the total EBC. The EBC of eachimpurity element s
16、hall be calculated individually using thefollowing equation:EBC of impurity 5 EBC factor! 3 mg of impurity/g pellet! (1)4.2.2 Should the EBC of additional elements not listedPractice C1233 be of concern, their inclusion in the summationand their respective EBC factors must be mutually agreed uponby
17、the buyer and the seller.4.2.3 The hydrogen impurity (including moisture) level,detailed procedure for measuring hydrogen, and packagingrequirements associated with hydrogen contamination, shall beagreed upon between the buyer and the seller.5. Physical Properties5.1 Physical Dimensions:5.1.1 Dimens
18、ional requirements shall be in accordance withapplicable drawings and purchase order documents.5.1.2 Pellet dimensions shall be measured to ensure com-pliance with the buyers requirements. Sampling plans to meetacceptance criteria shall be agreed upon between the buyer andthe seller to ensure that t
19、he pellets represented by the sampleare within the required tolerances.5.2 Density:5.2.1 Pellet density limits shall be specified by the buyer.5.2.2 The method of density measurement shall be TestMethod C559 or an alternative method approved by the buyerprior to use. Sampling plans to meet acceptanc
20、e criteria shallbe agreed upon between the seller and the buyer. The methodof density measurement and the method of compliance with5.2.1 shall be approved by the buyer prior to use.5.3 Mechanical PropertiesRequired mechanical proper-ties and test methods shall be mutually agreed upon betweenthe buye
21、r and the seller.5.4 Visual AppearanceVisual examination shall be con-ducted on finished pellets in accordance with Section 7. Theseller and the buyer shall agree on visual standards as repre-senting the requirements of 5.4.1, 5.4.2, and 5.4.3. Thesestandards shall be used as acceptance standards fo
22、r the visualexamination of the pellets. In the event of a dispute, the methodof defect measurement shall be submitted by the seller forapproval by the buyer. Maximum permissible defects aredefined as follows:5.4.1 End ChipsPellet end surface shall not be chippedbeyond 10 % of the end-face surface ar
23、ea and no chip shallexceed 1.0 mm (0.040 in.) in depth.5.4.2 Circumferential ChipsPellet circumferential sur-faces shall not be chipped beyond 5 % of the circumferentialsurface area. No single chip shall exceed a depth of 1.0 mm(0.040 in.).5.4.3 CracksNo single crack shall exceed 90 of circum-ferenc
24、e in length.5.4.4 Fissures and other defects shall be evaluated withrespect to the criteria of 5.4.1, 5.4.2, and 5.4.3.6. Cleanliness6.1 The finished pellets shall be handled in a manner toavoid contamination by grinding fluids and dust, cleaningagents, and organic materials such as plastics and pap
25、er used inpackaging. Cleaning solutions, if used, shall be free of halidesor nonvolatile additives and shall be removed from the pelletsprior to sampling and packaging.7. Sampling7.1 Sampling plans to meet acceptance criteria and inspec-tion and measurement procedures that describe the method ofcomp
26、liance with this specification shall be established by theseller and shall be approved by the buyer prior to use. Thedegree of sampling shall be specified in the purchase order.Practice E105 is referenced as a guide.7.2 Each sample taken shall be sufficient for quality verifi-cation tests, acceptanc
27、e tests and archive samples, as needed.7.3 Archive samples shall be retained and disposed inaccordance with the buyers instructions.8. Inspection and Certification8.1 The seller shall inspect the material covered by thisspecification and shall furnish the buyer with certificates oftests showing the
28、results of testing and inspection performed oneach pellet lot prior to shipment. The seller shall certify thateach pellet lot is in compliance with the provisions of thisspecification.9. Rejection9.1 Unless the buyer and the seller agree otherwise, rejec-tion and acceptance shall be on a pellet lot
29、basis.9.2 Pellet lots that fail to conform to the requirements of thisspecification may be rejected by the buyer. The seller maypetition the buyer to waive selected requirements for identifiedout-of-specification lots. Decision to grant such waiver belongsto the buyer. The seller may also apply any
30、remedy to bringrejected lots into specification providing the seller can demon-strate to the buyer that such remedy does not impair thefunction or preclude the certification of the rejected material.9.3 In the event of disagreement over the results of analysis,samples shall be submitted to a mutuall
31、y selected referee forresolution.10. Packaging and Shipping10.1 The pellets shall be packaged in sealed containers forshipment from the seller to the buyer. The seller shall beresponsible for using the shipping container to assure thepellets arrive still in conformance with this specification, and t
32、oassure reasonable ease of unpacking.10.2 Each container shall be clearly marked with the fol-lowing:C785 08 (2015)210.2.1 Aluminum oxide pellets,10.2.2 Purchase order number,10.2.3 Gross, tare, and net weights,10.2.4 Lot number, and10.2.5 Name of manufacturer.11. Quality Assurance11.1 Quality assur
33、ance requirements shall be specified in thepurchase order. Code of Federal Regulations Title 10, Part 50,Appendix B and NQA-1 are referenced as guides.12. Keywords12.1 Al2O3; aluminum oxide; filler pellets; spacer pellets;spacersASTM International takes no position respecting the validity of any pat
34、ent 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 infringement of such rights, are entirely their own responsibility.This standard is subject to revision
35、 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 or for additional standardsand should be addressed to ASTM International Headquarters. Your comm
36、ents 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 known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighte
37、d 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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 08 (2015)3
