ASTM_D_5411_-_21.pdf

Designation:D541121Standard Practice forCalculation of Average Energy Per Disintegration(E)for aMixture of Radionuclides in Reactor Coolant1This standard is issued under the fixed designation D5411;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 practice applies to the calculation of the averageenergy per disintegration(E)for a mixture of radionuclides inreactor coolant water.1.2 The microcurie(Ci)is the standard unit of measure-ment for this standard.The values given in parentheses aremathematical conversions to SI units,which are provided forinformation only and are not considered standard.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1066 Practice for Sampling SteamD1129 Terminology Relating to WaterD3370 Practices for Sampling Water from Flowing ProcessStreamsD3648 Practices for the Measurement of RadioactivityD7282 Practice for Set-up,Calibration,and Quality Controlof Instruments Used for Radioactivity MeasurementsD7902 Terminology for Radiochemical Analyses2.2 Code of Federal Regulations:10 CFR 100 Reactor Site Criteria33.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminologies D1129 and D7902.For terms not defined in thistest method or in Terminologies D1129 and D7902,refer toother published glossaries.44.Summary of Practice4.1 The average energy per disintegration,E(pronounced Ebar),for a mixture of radionuclides is calculated from theknown composition of the mixture.Eis computed by calcu-lating the total beta/gamma energy release rate,in MeV,anddividing it by the total disintegration rate.The resultantEhasunits of MeV per disintegration.5.Significance and Use5.1 This practice is useful for the determination of theaverage energy per disintegration of the isotopic mixture foundin the reactor-coolant system of a nuclear reactor(1).5TheEvalue is used to calculate a site-specific activity limit for thereactor coolant system,generally identified as:Alimiting5 K/E(1)where:K=a power reactor site specific constant(usually in therange of 50 to 200).The activity of the reactor coolant system is routinelymeasured,then compared to the value of Alimiting.If the reactorcoolant activity value is less than Alimitingthen the 2-h radiationdose,measured at the plant boundary,will not exceed anappropriately small fraction of the Code of Federal1This practice is under the jurisdiction of ASTM Committee D19 on Water andis the direct responsibility of Subcommittee D19.04 on Methods of RadiochemicalAnalysis.Current edition approved Dec.15,2021.Published February 2022.Originallyapproved in 1993.Last previous edition approved in 2015 as D5411 10(2015).DOI:10.1520/D5411-21.2For 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 DLA Document Services,Building 4/D,700 Robbins Ave.,Philadelphia,PA 19111-5094,http:/quicksearch.dla.mil.4“American National Standard Glossary of Terms,”Nuclear Science andTechnology(ANSI N1.1),American National Standards Institute,1430 Broadway,New York,NY 10018.5The boldface numbers in parentheses refer to a list of references at the end ofthis practice.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1Regulations,Title 10,part 100 dose guidelines.It is importantto note that the measurement of the reactor coolant systemradioactivity is determined at a set frequency by use of gammaspectrometry only.Thus,the radionuclides that go into thecalculation ofEand subsequently Alimitingare only those thatare measured using gamma spectrometry.5.2 In calculatingE,the energy dissipated by beta particles(negatrons and positrons)and photons from nuclear deca