【国外标准】 Standard Test Methods for Chemical, Mass Spectrometric, and Spectrochemical Analysis of Nuclear-Grade Aluminum Oxide and AluminumOxide-Boron Carbide Composite Pellets

4.1 Aluminum oxide pellets are used in a reactor core as filler or spacers within fuel, burnable poison, or control rods. In order to be suitable for this purpose, the material must meet certain criteria for impurity content. These test methods are designed to show whether or not a given material meets the specifications for these items as described in Specification C785.4.1.1 Impurity content is determined to ensure that the maximum concentration limit of certain impurity elements is not exceeded.4.2 Aluminum oxide-boron carbide composite pellets are used in a reactor core as a component in neutron absorber rods. In order to be suitable for this purpose, the material must meet certain criteria for boron content, isotopic composition, and impurity content as described in Specification C784.4.2.1 The material is assayed for boron to determine whether the boron content is as specified by the purchaser.4.2.2 Determination of the isotopic content of the boron is made to establish whether the 10B concentration is in compliance with the purchaser's specifications.4.2.3 Impurity content is determined to ensure that the maximum concentration limit of certain impurity elements is not exceeded.1.1 These test methods cover procedures for the chemical, mass spectrometric, and spectrochemical analysis of nuclear-grade aluminum oxide and aluminum oxide-boron carbide composite pellets to determine compliance with specifications.1.2 The analytical procedures appear in the following order:  Sections Boron by Titrimetry and ICP OES  8 to 17Separation of Boron for Mass Spectrometry 18 to 23Isotopic Composition by Mass Spectrometry 24 to 27Separation of Halides by Pyrohydrolysis 28 to 31Chloride and Fluoride by Ion-Selective Electrode 32 to 34Chloride, Bromide, and Iodide by Amperometric Microtitrimetry 35 to 37Trace Elements by Emission Spectroscopy 38 to 50Keywords 511.3 The values stated in SI units are to be regarded as the standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. (For specific precautionary statements, see Section 6.)1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.