Standard Historical Last Updated: Jul 31, 2019
ASTM C799-12

Standard Test Methods for Chemical, Mass Spectrometric, Spectrochemical, Nuclear, and Radiochemical Analysis of Nuclear-Grade Uranyl Nitrate Solutions

Significance and Use

Uranyl nitrate solution is used as a feed material for conversion to the hexafluoride as well as for direct conversion to the oxide. In order to be suitable for this purpose, the material must meet certain criteria for uranium content, isotopic composition, acidity, radioactivity, and impurity content. These methods are designed to show whether a given material meets the specifications for these items described in Specification C788.

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

Determination of the isotopic content of the uranium is made to establish whether the effective fissile content is in accordance with the purchasers specifications.

Acidity, organic content, and alpha, beta, and gamma activity are measured to establish that they do not exceed their maximum limits.

Impurity content is determined to ensure that the maximum concentration limit of certain impurity elements is not exceeded. Impurity concentrations are also required for calculation of the equivalent boron content (EBC), and the total equivalent boron content (TEBC).

Scope

1.1 These test methods cover procedures for the chemical, mass spectrometric, spectrochemical, nuclear, and radiochemical analysis of nuclear-grade uranyl nitrate solution to determine compliance with specifications.

1.2 The analytical procedures appear in the following order:

Sections
Determination of Uranium 7
Specific Gravity by Pycnometry 15-20
Free Acid by Oxalate Complexation 21-27
Determination of Thorium28
Determination of Chromium29
Determination of Molybdenum30
Halogens Separation by Steam Distillation 31-35
Fluoride by Specific Ion Electrode 36-42
Halogen Distillate Analysis: Chloride, Bromide, and Iodide by
Amperometric Microtitrimetry
43
Determination of Chloride and Bromide44
Determination of Sulfur by X-Ray Fluorescence45
Sulfate Sulfur by (Photometric) Turbidimetry46
Phosphorus by the Molybdenum Blue (Photometric) Method 54-61
Silicon by the Molybdenum Blue (Photometric) Method62-69
Carbon by Persulfate Oxidation-Acid Titrimetry70
Conversion to U3O871-74
Boron by Emission Spectrography75-81
Impurity Elements by Spark Source Mass Spectrography82
Isotopic Composition by Thermal Ionization Mass Spectrometry83
Uranium-232 by Alpha Spectrometry84-90
Total Alpha Activity by Direct Alpha Counting91-97
Fission Product Activity by Beta Counting98-104
Entrained Organic Matter by Infrared Spectrophotometry105
Fission Product Activity by Gamma Counting106
Determination of Arsenic107
Determination of Impurities for the EBC Calculation108
Determination of Technetium 99109
Determination of Plutonium and Neptunium110

1.3 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 and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 5.

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Details
Book of Standards Volume: 12.01
Developed by Subcommittee: C26.05
Pages: 14
DOI: 10.1520/C0799-12
ICS Code: 27.120.30