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Significance and Use
5.1 Uranium hexafluoride is normally produced and handled in large (typically 1- to 14-ton) quantities and must, therefore be characterized by reference to representative samples. The samples are used to determine compliance with the applicable commercial Specifications and by means of the appropriate test method (for example, Test Method and references therein). The quantities involved, physical properties, chemical reactivity, and hazardous nature of UF6 are such that for representative sampling, specially designated equipment must be used and operated in accordance with the most carefully controlled and stringent procedures. This practice indicates appropriate principles, equipment and procedures currently in use for subsampling of liquid UF6. It is used by UF6 converters, enrichers and fuel fabricators to review the effectiveness of existing procedures or to design equipment and procedures for future use. Other subsampling procedures such as UF6 vapor sampling are not directly representative of the chemical quality of liquid UF6.
5.2 It is emphasized that this test guide is not meant to address conventional or nuclear criticality safety issues, nor does it address the conditioning of subsample tubes to make them suitable for transport.
1.1 This practice is applicable to subsampling uranium hexafluoride (UF6), using heat liquefaction techniques, from bulk containers, obtained in conformance with Practices , , and , into smaller sample containers, which are required for laboratory analyses.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 It is assumed that the liquid UF6 being sampled comprises a single quality and quantity of material. This practice does not address any special additional arrangement that might be required for taking proportional or composite samples.
1.4 The number of samples to be taken, their nominal sample weight, and their disposition shall be agreed upon between the parties.
1.5 The scope of this practice does not include provisions for preventing criticality incidents.
1.6 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.
1.7 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C761 Test Methods for Chemical, Mass Spectrometric, Spectrochemical, Nuclear, and Radiochemical Analysis of Uranium Hexafluoride
C787 Specification for Uranium Hexafluoride for Enrichment
C859 Terminology Relating to Nuclear Materials
C996 Specification for Uranium Hexafluoride Enriched to Less Than 5% 235U
C1052 Practice for Bulk Sampling of Liquid Uranium Hexafluoride
C1703 Practice for Sampling of Gaseous Uranium Hexafluoride for Enrichment
C1883 Practice for Sampling of Gaseous Enriched Uranium Hexafluoride
Other DocumentsANSI N14.1 Uranium Hexafluoride: Packaging for Transport Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org. USEC-651 The UF 6 Manual: Good Handling Practices for Uranium Hexafluoride, latest revision Available from Centrus Energy Corporation, 6901 Rockledge Drive, Bethesda, MD 20817.
ICS Number Code 27.120.30 (Fissile materials and nuclear fuel technology)
UNSPSC Code 15131500(Nuclear fuel)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM C1689-21, Standard Practice for Subsampling of Uranium Hexafluoride, ASTM International, West Conshohocken, PA, 2021, www.astm.orgBack to Top