ASTM_C_992_-_16.pdf

Designation:C99216Standard Specification forBoron-Based Neutron Absorbing Material Systems for Usein Nuclear Fuel Storage Racks in a Pool Environment1This standard is issued under the fixed designation C992;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 parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification defines criteria for boron-based neu-tron absorbing material systems used in racks in a poolenvironment for storage of nuclear light water reactor(LWR)spent-fuel assemblies or disassembled components to maintainsub-criticality in the storage rack system.1.2 Boron-based neutron absorbing material systems nor-mally consist of metallic boron or a chemical compoundcontaining boron(for example,boron carbide,B4C)supportedby a matrix of aluminum,steel,or other materials.1.3 In a boron-based absorber,neutron absorption occursprimarily by the boron-10 isotope that is present in naturalboron to the extent of 18.3 6 0.2%by weight(depending uponthe geological origin of the boron).Boron,enriched inboron-10 could also be used.1.4 The materials systems described herein shall be func-tional that is always be capable to maintain a boron-10 arealdensity such that subcriticality is maintained depending on thedesign specification for the service life in the operatingenvironment of a nuclear spent fuel pool.1.5 Observance of this specification does not relieve theuser of the obligation to conform to all applicable international,national,and local regulations.1.6 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 the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C859 Terminology Relating to Nuclear MaterialsC1187 Guide for Establishing Surveillance Test Program forBoron-Based Neutron Absorbing Material Systems forUse in Nuclear Fuel Storage Racks In a Pool EnvironmentE105 Practice for Probability Sampling of MaterialsE2971 Test Method for Determination of Effective Boron-10Areal Density in Aluminum Neutron Absorbers usingNeutron Attenuation MeasurementsASTM Dictionary of Engineering Science and Technology2.2 ANSI and ASME Standards:3ANSI N45.2.2 Packaging,Shipping,Receiving,Storage andHandling of Items for Nuclear Power PlantsASME NQA-1 QualityAssurance Requirements for NuclearFacility Application2.3 U.S.Government Documents:410CFR50 Title 10,CFR,Energy Part 50 Licensing ofProduction and Utilization Facilities10CFR72 Title 10,CFR,Energy Part 72 LicensingRequirements for the Storage of Spent Fuel in an Inde-pendent Spent Fuel Storage Installation(ISFSI)3.Terminology3.1 Terms shall be defined in accordance with TerminologyC859 or the ASTM Dictionary of Engineering Science andTechnology3.2 Definitions of Terms Specific to This Standard:3.2.1 accelerated testinga procedure for investigating thepotential for long-term changes in physical properties orchemical composition of a material important to safety,causedby a system operating parameter such as temperature,chemicalenvironment or radiation.3.2.1.1 DiscussionThe procedure uses a value of theidentified parameter that is outside the normal bound of theoperating parameter being investigated,in order to(1)increasethe rate of degradation,if any,(2)identify the operating limitfor acceptable limit of the parameter,and(3)to provideinformation that might assist in interpreting the degradation1This 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.15,2016.Published February 2016.Originallyapproved in 1983.Last previous edition approved in 2011 as C992 11.DOI:10.1520/C0992-16.2For 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 theAmerican National Standards Institute,11 W.42nd St.,13thFloor,New York,NY 10036.4Available from Superintendent of Documents,U.S.Government PrintingOffice,Washington,DC 20402.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 mechanism(s)involved.In this manner,the long-term behaviorof a material may be simulated in an appreciably shorter periodof time.3.2.2 areal densitythe boron-10 per unit area of a sheet,which is equivalent to the mass per unit volume of boron-10 inthe material multiplied by the thickness of the material inwhich that isotope is contained.3.2.3 buyerthe organization issuing the purchase order.3.2.4 deg