1、Designation:C167115Standard Practice forQualification and Acceptance of Boron Based MetallicNeutron Absorbers for Nuclear Criticality Control for DryCask Storage Systems and Transportation Packaging1This standard is issued under the fixed designation C1671;the number immediately following the design
2、ation indicates the year oforiginal adoption or,in the case of revision,the year of last 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 practice provides procedures for q
3、ualification andacceptance of neutron absorber materials used to providecriticality control by absorbing thermal neutrons in systemsdesigned for nuclear fuel storage,transportation,or both.1.2 This practice is limited to neutron absorber materialsconsisting of metal alloys,metal matrix composites(MM
4、Cs),and cermets,clad or unclad,containing the neutron absorberboron-10(10B).1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine
5、the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2B557 Test Methods for Tension Testing Wrought and CastAluminum-and Magnesium-Alloy ProductsB557M Test Methods for Tension Testing Wrought and CastAluminum-and Magnesium-Alloy Products(Metric)C791 Test
6、 Methods for Chemical,Mass Spectrometric,andSpectrochemical Analysis of Nuclear-Grade Boron Car-bideE8 Test Methods for Tension Testing of Metallic MaterialsE21 Test Methods for Elevated Temperature Tension Tests ofMetallic MaterialsE456 Terminology Relating to Quality and StatisticsE1225 Test Metho
7、d for Thermal Conductivity of SolidsUsing the Guarded-Comparative-Longitudinal Heat FlowTechniqueE1461 Test Method for Thermal Diffusivity by the FlashMethod3.Terminology3.1 Definitions:3.1.1 acceptance test,nfor a neutron absorber material,quality control,tests,and inspections conducted to determin
8、ewhether a specific production lot meets selected specifiedmaterial properties,characteristics,or both,so that the lot canbe accepted.3.1.2 areal density,nfor neutron absorber materials withflat parallel surfaces,the density of the neutron absorber timesthe thickness of the material(g/cm2).3.1.3 dur
9、ability,nthe ability of neutron absorber materialsto withstand service conditions without physical changes thatwould render them unable to perform their design functions.3.1.4 lot,na quantity of a product or material accumulatedunder conditions that are considered uniform for samplingpurposes.E4563.
10、1.5 moderator,na material used to reduce neutronenergy by scattering without appreciable capture.3.1.6 neutron absorber,na nuclide that has a large thermalneutron absorption cross section(also known as a neutronpoison).3.1.7 neutron-absorber material,na compound,alloy,composite or other material tha
11、t contains a neutron absorber.3.1.8 neutron attenuation test,nfor neutron absorbermaterials,a process in which a material is placed in a thermalneutron beam,and the number of neutrons transmitted throughthe material in a specified period of time is counted.Theneutron count can be converted to areal
12、density by performingthe same test on a series of appropriate calibration standardsand comparing the results.3.1.9 neutron cross section,barn,na measure of theprobability that a neutron will interact with a nucleus in theabsorbing medium and is a function of the neutron energy.3.1.10 open porosity,n
13、the volume fraction of all pores,voids,and channels within a solid mass that are interconnected1This practice is under the jurisdiction of ASTM Committee C26 on NuclearFuel Cycle and is the direct responsibility of Subcommittee C26.03 on NeutronAbsorber Materials Specifications.Current edition appro
14、ved Jan.1,2015.Published January 2015.Originallyapproved in 2007.Last previous edition approved in 2007 as C1671-07.DOI:10.1520/C1671-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume infor
15、mation,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 with each other and communicate with the external surface,and thus are measurable by gas or liquid penetration.C242,C21
16、3.1.11 packaging,nin transport of radioactive material,the assembly of components necessary to enclose the radioac-tive contents completely.33.1.12 probability sampling,na sample selection proce-dure in which the sampling units are selected by a chanceprocess such that,at each step of the selection,a specifiedprobability of selection can be attached to each sampling unitavailable for selection.E4563.1.13 qualification,nfor neutron absorber materials,theprocess of evaluating,testing,or both,a mat
