1、Designation: C 785 08Standard Specification forNuclear-Grade Aluminum Oxide Pellets1This standard is issued under the fixed designation C 785; 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 p
2、arentheses 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 spacers within fuel
3、, 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 standard. The values
4、 given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2. Referenced Documents2.1 ASTM Standards:2C 559 Test Method for Bulk Density by Physical Measure-ments of Manufactured Carbon and Graphite ArticlesC 809 Test Methods f
5、or Chemical, Mass Spectrometric, andSpectrochemical Analysis of Nuclear-Grade AluminumOxide and AluminumOxide-Boron Carbide CompositePelletsC 859 Terminology Relating to Nuclear MaterialsE 105 Practice for Probability Sampling Of Materials2.2 ANSI Standard:ANSI/ASME NQA-1 Quality Assurance Requireme
6、nts 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 DefinitionsTerms shall be defined in accordance withTerminology C 859 except for the follow
7、ing: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 Section 4.3.2.3 pellet lotthat quantity of pellets produced from onealuminum oxide powder lo
8、t 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,blended together such that samples taken in accordance with7.1 can be considered as repre
9、sentative of the entire specifiedquantity.3.2.5 selleraluminum oxide pellet supplier.4. Chemical Composition4.1 Use analytical chemistry methods in accordance withMethods C 809 or alternate methods agreed upon between thebuyer and the seller.4.2 The finished aluminum oxide pellets shall conform toth
10、e 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 + Cl + I + Br 100 g/g pellet maxAny element impurity not listed in 4.2 shall not exceed 1
11、weight % as determined by emission spectroscopy. The sum ofall impurities shall not exceed 4.0 weight %.4.2.1 The total 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. Table
12、1 is a list of elements to be considered incalculating the total EBC. The EBC of each impurity elementshall be calculated individually using the following equation:EBC of impurity 5EBC factor!3mg of impurity/g pellet! (1)1This specification is under the jurisdiction of ASTM Committee C26 onNuclear F
13、uel Cycle and is the direct responsibility of Subcommittee C26.03 onNeutron Absorber Materials Specifications.Current edition approved Dec. 1, 2008. Published December 2008. Originallyapproved in 1976. Last previous edition approved in 1993 as C 785 931whichwas withdrawn May 2002 and reinstated in D
14、ecember 2008.2For 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.3Available from American National Standards Inst
15、itute (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.access.gpo.gov.1Copyright ASTM International, 100 Barr Harbor Drive, PO B
16、ox C700, West Conshohocken, PA 19428-2959, United States.4.2.2 Should the EBC of additional elements not listed inTable 1 be of concern, their inclusion in the summation andtheir respective EBC factors must be mutually agreed upon bythe buyer and the seller.4.2.3 The hydrogen impurity (including moi
17、sture) 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 Dimensional requirements shall be in accordance withapplicable drawings a
18、nd 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 the pellets represented by the sampleare within the required toleran
19、ces.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 C 559 or an alternative method approved by the buyerprior to use. Sampling plans to meet acceptance criteria shallbe agreed upon between the seller and the buyer. T
20、he 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 buyer and the seller.5.4 Visual AppearanceVisual examination shall be
21、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 for the visualexamination of the pellets. In the event of a dispute,
22、 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 area and no chip shallexceed 1.0 mm (0.040 in.) in depth.5.4.2 Circu
23、mferential 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-ference in length.5.4.4 Fissures and other defects shall be evaluated wi
24、threspect 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 paper used inpackaging. Cleaning solutions, if used, shall be free of
25、 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 ofcompliance with this specification shall be established by theseller a
26、nd shall be approved by the buyer prior to use. Thedegree of sampling shall be specified in the purchase order.Practice E 105 is referenced as a guide.7.2 Each sample taken shall be sufficient for quality verifi-cation tests, acceptance tests and arcive samples, as needed.7.3 Archive samples shall b
27、e 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 results of testing and inspection performed oneach pellet lot prio
28、r 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 basis.9.2 Pellet lots that fail to conform to the requirements of
29、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 remedy to bringrejected lots into specification providing the sell
30、er 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 mutually selected referee forresolution.10. Packaging and Shipping10.1 Th
31、e 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 toassure reasonable ease of unpacking.10.2 Each container shall be
32、clearly marked with the fol-lowing:10.2.1 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 assurance requirements shall be specified in thepurchase order. Code of Federal Regula
33、tions Title 10, Part 50,Appendix B and NQA-1 are referenced as guides.12. Keywords12.1 Al2O3; aluminum oxide; filler pellets; spacer pellets;spacersC785082ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.
34、 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 reviewed e
35、very 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 theresponsible tec
36、hnical 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, 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).C785083
