Standard Active Last Updated: Jul 31, 2019
ASTM C799-19

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

Significance and Use

4.1 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.

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

4.1.2 Determination of the isotopic content of the uranium is made to establish whether the effective fissile content is in accordance with the purchaser’s specifications.

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

4.1.4 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

8

Specific Gravity by Pycnometry

16 – 21

Free Acid by Oxalate Complexation

22 – 28

Determination of Thorium

29

Determination of Chromium

30

Determination of Molybdenum

31

Halogens Separation by Steam Distillation

32 – 36

Fluoride by Specific Ion Electrode

37 – 43

Halogen Distillate Analysis: Chloride, Bromide, and Iodide by
  Amperometric Microtitrimetry

44

Determination of Chloride and Bromide

45

Determination of Sulfur by X-Ray Fluorescence

46

Sulfate Sulfur by (Photometric) Turbidimetry

47

Phosphorus by the Molybdenum Blue (Photometric) Method

55 – 62

Silicon by the Molybdenum Blue (Photometric) Method

63 – 70

Carbon by Persulfate Oxidation-Acid Titrimetry

71

Conversion to U3O8

72 – 75

Boron by Emission Spectrography

A

Impurity Elements by Spark Source Mass Spectrography

77

Isotopic Composition by Thermal Ionization Mass Spectrometry

78

Uranium-232 by Alpha Spectrometry

79 – 85

Total Alpha Activity by Direct Alpha Counting

86 – 92

Fission Product Activity by Beta Counting

93 – 99

Entrained Organic Matter by Infrared Spectrophotometry

100

Fission Product Activity by Gamma Counting

101

Determination of Arsenic

102

Determination of Impurities for the EBC Calculation

103

Determination of Technetium 99

104

Determination of Plutonium and Neptunium

105

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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. Specific precautionary statements are given in 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.

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Details
Book of Standards Volume: 12.01
Developed by Subcommittee: C26.05
Pages: 14
DOI: 10.1520/C0799-19
ICS Code: 27.120.30