Значение и использование

Boron carbide is used as a control material in nuclear reactors. In order to be suitable for this purpose, the material must meet certain criteria for assay, isotopic composition, and impurity content. These methods are designed to show whether or not a given material meets the specifications for these items as described in Specifications C 750 and C 751.

3.1.1 An assay is performed to determine whether the material has the specified boron content.

3.1.2 Determination of the isotopic content of the boron is made to establish whether the content is in compliance with the purchaser’specifications.

3.1.3 Impurity content is determined to ensure that the maximum concentration limit of certain impurity elements is not exceeded.

Область применения

1.1 These test methods cover procedures for the chemical, mass spectrometric, and spectrochemical analysis of nuclear-grade boron carbide powder and pellets to determine compliance with specifications.

1.2 The analytical procedures appear in the following order:

SectionsTotal Carbon by Combustion and Gravimetry7-17Total Boron by Titrimetry18-28Isotopic Composition by Mass Spectrometry29-38Chloride and Fluoride Separation by Pyrohydrolysis39-45Chloride by Constant-Current Coulometry46-54Fluoride by Ion-Selective Electrode55-63Water by Constant-Voltage Coulometry64-72Impurities by Spectrochemical Analysis73-81Soluble Boron by Titrimetry82-95Soluble Carbon by a Manometric Measurement96-105Metallic Impurities by a Direct Reader Spectrometric Method106-114