1、Designation: C751 07 (Reapproved 2012)Standard Specification forNuclear-Grade Boron Carbide Pellets1This standard is issued under the fixed designation C751; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision
2、. 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 boron carbide pellets foruse as a control material in nuclear reactors.1.2 The values stated in SI un
3、its are to be regarded as thestandard. The values given in parentheses are for informationonly.2. Referenced Documents2.1 ASTM Standards:2C559 Test Method for Bulk Density by Physical Measure-ments of Manufactured Carbon and Graphite ArticlesC750 Specification for Nuclear-Grade Boron Carbide Pow-der
4、C791 Test Methods for Chemical, Mass Spectrometric, andSpectrochemical Analysis of Nuclear-Grade Boron Car-bideC859 Terminology Relating to Nuclear MaterialsE105 Practice for Probability Sampling of Materials2.2 ANSI Standard:ANSI/ASME NQA-1 Quality Assurance Program Require-ments for Nuclear Facili
5、ties32.3 U.S. Government Document:Title 10, CFR, Energy Part 50 (10 CFR 50) Licensing ofDomestic Production and Utilization Facilities43. Terminology3.1 Terms shall be defined in accordance with TerminologyC859, except for the following:3.2 buyerthe organization issuing the purchase order.3.3 pellet
6、 lotthat quantity of pellets produced from oneboron carbide powder lot using one set of process parameters.The pellet lot size shall be agreed upon between seller andbuyer.3.4 powder lota fixed quantity of boron carbide powderblended together such that samples taken in accordance withSection 7 on Sa
7、mpling can be considered as representative ofthe entire fixed quantity.3.5 sellerthe boron carbide pellet supplier.4. Chemical Composition4.1 The starting boron carbide powder used to produce thesepellets shall be in accordance with Specification C750.4.2 Analytical chemistry methods used to test pe
8、llets forconformance with this specification shall be those of MethodC791 or demonstrated equivalent methods agreed upon be-tween buyer and seller.4.3 The10B concentration (gram10B per unit volume orgrams10B per unit length) may be specified by the buyer. Thebuyer should consider the following in sp
9、ecifying the allow-able range in10B concentration:4.3.1 Variations in chemical composition,4.3.2 Bulk pellet density,4.3.3 Boron isotopic composition, and4.3.4 Pellet dimensions.4.4 The finished boron carbide pellets shall conform to thechemical analysis in Table 1.5. Physical Requirements Physical
10、Requirements5.1 Physical Dimensions:5.1.1 Dimensional 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.5.2 Density:5.2.1 Pellet density limits shall be specified by th
11、e buyer.5.2.2 The method of density measurement shall be TestMethod C559 or an alternative method approved by the buyer.Sampling plans to meet the acceptance criteria shall be agreedupon between the buyer and the seller. The method of densitymeasurement and the method of compliance with 5.2.1 shall
12、beapproved by the buyer.1This 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, 2012. Published January 2012. Originallyapproved in 19
13、75. Discontinued in April 2001 and reinstated as C75107. Lastprevious edition approved in 2007 as C751 07. DOI: 10.1520/C0751-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informati
14、on, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute, 11 W. 42nd St., 13thFloor, New York, NY 10036.4Available from U.S. Government Printing Office, Washington, DC 20402.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box
15、C700, West Conshohocken, PA 19428-2959, United States.5.3 Visual AppearanceVisual examination shall be con-ducted on finished pellets in accordance with Section 7 onSampling. As soon as practical after finished pellets areavailable, the seller and buyer shall jointly select two sets ofvisual standar
16、ds for defining the requirements of 5.3.1, 5.3.2,and 5.3.3. One set of standards shall be used each by the sellerand buyer as an acceptance standard in the visual examinationof the pellets. The method of measurement of defects in case ofa dispute shall be approved by the buyer. Maximum permis-sible
17、defects are defined as follows:5.3.1 End ChipsPellet end surfaces shall not be chippedbeyond 10 % of the end-face surface area, and no chip shallexceed 1.02 mm (0.040 in.) in depth.5.3.2 Circumferential ChipsPellet circumferential sur-faces shall not be chipped beyond 5 % of the circumferentialsurfa
18、ce area. No single chip shall exceed a depth of 1.02 mm(0.040 in.).5.3.3 CracksIndividual cracks not exceeding 90 of cir-cumference in length are acceptable provided other require-ments of the specification are met. Acceptable number ofcracks shall be specified by the buyer5.3.4 Fissures and other d
19、efects shall be evaluated withrespect to the criteria of 5.3.1, 5.3.2, and 5.3.3.5.4 Mechanical PropertiesRequired mechanical proper-ties and test methods shall be mutually agreed upon betweenbuyer and seller.6. Cleanliness6.1 finished pellets shall be handled in a manner to avoidcontamination by gr
20、inding fluids and dust, agents and organicmaterials such as plastics and paper used in packaging.Cleaning solutions, if used, shall be free of halides or nonvola-tile additives and shall be removed from the pellets prior tosampling and packaging.7. Sampling7.1 Sampling plans to meet acceptance crite
21、ria and inspec-tion and measurement procedures that describe the method ofcompliance with this specification shall be approved by thebuyer prior to manufacture of the required pellets. The degreeof sampling varies with the application and for this reasonshould be specified in the purchase order. E10
22、5 is referenced asa guide.7.2 Powder and pellet samples taken shall be sufficient, asnecessary, for quality verification tests, acceptance tests, ref-eree tests, and the retention of archive samples7.3 Archive samples shall be retained and disposed of inaccordance with the buyers instructions.8. Ins
23、pection 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 prior to shipment. The seller shall certify thateach pellet lot is in compli
24、ance with the provisions of thisspecification.9. Rejection and Rehearing9.1 Unless buyer and seller agree otherwise, rejection andacceptance shall be on a pellet lot basis.9.2 Pellet lots that fail to conform to the requirements of thisspecification may be rejected by the buyer. The seller maypetiti
25、on 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 he can demonstrate tothe buyer that such remedy does not impair the function
26、 orpreclude the certification of the rejected material.9.3 In the event of disagreement over the results of analyses,samples shall be submitted to a mutually selected referee forresolution.10. Packaging and Shipping10.1 The pellets shall be packaged in sealed containers forshipment from the seller t
27、o the buyer. The seller shall beresponsible for using the shipping container to ensure thepellets arrive still in conformance with this specification.10.2 Each container shall be clearly marked with the fol-lowing: Boron carbide pellets, purchase order number, gross,net, and tare weights, lot number
28、, and name of seller.11. Quality Assurance11.1 Quality assurance requirements shall be agreed uponbetween the buyer and seller when specified in the purchaseorder. Code of Federal Regulations Title 10 Part 50 AppendixB and ASTME NQA-1 are referenced as guides.12. Keywords12.1 boron carbide pellets;
29、B4C neutron absorber; controlmaterialTABLE 1 1 Chemical Analysis of Finished Boron Carbide PelletsConstituent LimitsTotal boron 81.0 % weight, max73.0 % weight, minNitric acid-soluble boron 0.5 % weight, maxWater-soluble boron 0.2 % weight, maxCalcium 0.3 % weight, maxIron 1.0 % weight, maxTotal bor
30、on + total carbon 98.0 % weight, minFluoride 25 g/g, maxChloride 75 g/g, maxWater 750 g/g, maxAAUltimate usage of the pellets in a control rod may require drying to a lowermoisture level.C751 07 (2012)2ASTM International takes no position respecting the validity of any patent rights asserted in conn
31、ection 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 at any time by the respons
32、ible 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 comments will receive careful c
33、onsideration 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 copyrighted by ASTM International, 10
34、0 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 ASTM website (www.astm.org/COPYRIGHT/).C751 07 (2012)3
