Significance and Use
4.1 Uranium hexafluoride is a basic material used to prepare nuclear reactor fuel. To be suitable for this purpose the material must meet criteria for uranium content, isotopic composition, metallic impurities, hydrocarbon and halohydrocarbon content. These test methods are designed to determine whether the material meets the requirements described in Specifications C787 and C996.
4.2 Fitness for Purpose of Safeguards and Nuclear Safety Applications—Methods intended for use in safeguards and nuclear safety applications shall meet the requirements specified by Guide C1068 for use in such applications. However, adherence to these procedures does not automatically guarantee regulatory acceptance of the resulting safeguards measurements. It remains the sole responsibility of the user of these test methods to assure that its application to safeguards has the approval of the proper regulatory authorities.
4.3 When used in conjunction with appropriate certified reference materials (CRMs), these procedures can demonstrate traceability to the national measurement base.
Scope
1.1 These test methods cover or give reference to procedures for subsampling and for chemical, mass spectrometric, spectrochemical, nuclear, and radiochemical analysis of uranium hexafluoride (UF6). Most of these test methods are in routine use to determine conformance to UF6 specifications in the Enrichment and Conversion Facilities.
1.2 The analytical procedures in this document appear in the following order:
Note 1: Subcommittee C26.05 will confer with C26.02 concerning the renumbered section in Test Methods C761 to determine how concerns with renumbering these sections are best addressed in subsequent publications as analytical methods are replaced with stand-alone analytical methods.
|
| Sections |
| Subsampling of Uranium Hexafluoride | 8 |
| Gravimetric Determination of Uranium | 9 – 17 |
| Titrimetric Determination of Uranium | 18 |
| Preparation of High-Purity U3O8 | 19 |
| Isotopic Analysis | 20 |
| Determination of Hydrocarbons, Chlorocarbons, and Partially Substituted Halohydrocarbons | 21 – 27 |
| Determination of Antimony | 28 |
| Determination of Bromine | 29 |
| Determination of Chlorine | 30 – 36 |
| Determination of Silicon and Phosphorus | 37 – 43 |
| Determination of Boron and Silicon | 44 |
| Determination of Ruthenium | 45 |
| Determination of Titanium and Vanadium | 46 |
| Spectrographic Determination of Metallic Impurities | 47 |
| Determination of Tungsten | 48 |
| Determination of Thorium and Rare Earth Elements | 49 |
| Determination of Molybdenum | 50 |
| Atomic Absorption Determination of Metallic Impurities | 51 – 56 |
| Impurity Determination by Spark-Source Mass Spectrography | 57 |
| Determination of Boron-Equivalent Neutron Cross Section | 58 |
| Determination of Uranium-233 Abundance by Thermal Ionization Mass Spectrometry | 59 |
| Determination of Uranium-232 by Alpha Spectrometry | 60 – 66 |
| Determination of Fission Product Activity | 67 |
| Determination of Plutonium by Ion Exchange and Alpha Counting | 68 – 72 |
| Determination of Plutonium by Extraction and Alpha Counting | 73 – 80 |
| Determination of Neptunium by Extraction and Alpha Counting | 81 – 88 |
| Atomic Absorption Determination of Chromium Soluble In Uranium Hexafluoride | 89 – 95 |
| Atomic Absorption Determination of Chromium Insoluble In Uranium Hexafluoride | 101 – 102 |
| Determination of Technetium-99 In Uranium Hexafluoride | 103 – 110 |
| Method for the Determination of Gamma-Energy Emission Rate from Fission Products in Uranium Hexafluoride | 112 |
| Determination of Metallic Impurities by ICP-AES | 113 – 122 |
| Determination of Molybdenum, Niobium, Tantalum, Titanium, and Tungsten by ICP-AES | 123 – 132 |
1.3 The values stated in SI units are to be regarded as standard. The non-SI unit for hydrogen ion concentration expressed in pH units, and non-SI units for radioactive decay expressed as both disintegrations per minute, symbol dpm, and counts per minute, symbol cpm, are regarded as standard. The non-SI unit of revolutions per minute, symbol rpm, is also regarded as 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 safeguard and safety consideration statements, see Section 7.)
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.
