ASTM C1703-08(2013)
(Practice)Standard Practice for Sampling of Gaseous Uranium Hexafluoride
Standard Practice for Sampling of Gaseous Uranium Hexafluoride
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 (see ISO/DIS 7195). The samples are used to determine compliance with the applicable commercial specifications C996 and C787. The quantities involved, physical properties, chemical reactivity, and hazardous nature of UF6 are such that for representative sampling, specially designed equipment must be used and operated in accordance with the most carefully controlled and stringent procedures. This practice can be used by UF6 converters, enrichers, and fuel fabricators to review the effectiveness of existing procedures or as a guide to the design of equipment and procedures for future use.
5.2 The intention of this practice is to avoid liquid UF6 sampling once the cylinder has been filled. For safety reasons, manipulation of large quantities of liquid UF6 should be avoided when possible.
5.3 It is emphasized that this practice is not meant to address conventional or nuclear criticality safety issues.
SCOPE
1.1 This practice covers methods for withdrawing representative sample(s) of uranium hexafluoride (UF6) during a transfer occurring in the gas phase. Such transfer in the gas phase can take place from a mother cylinder, for example in an autoclave to a receiving cylinder. It can also occur during the filling in the gas phase of a cylinder during a continuous production process, for example centrifuge enrichment facility or the distillation column in a conversion facility. Such sample(s) may be used for determining compliance with the applicable commercial specification, for example Specification C996 or Specification C787.
1.2 Since UF6 sampling is taken during the filling process, this practice does not address any special additional arrangements that may be agreed upon between the buyer and the seller when the sampled bulk material is being added to residues already present in a container (“heels recycle”). Such arrangements will be based on QA procedures such as traceability of cylinder origin (to prevent for example contamination with irradiated material).
1.3 If the receiving cylinder is purged after filling and sampling, special verifications must be performed by the user to verify the representativity of the sample(s). It is then expected that the results found on volatile impurities with gas phase sampling may be conservative.
1.4 This practice is only applicable when the transfer occurs in the gas phase. When the transfer is performed in the liquid phase, Practice C1052 should apply. This practice does not apply to gas sampling after the cylinder has been filled since the sample taken will not be representative of the cylinder.
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.
General Information
Standards Content (Sample)
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Designation:C1703 −08 (Reapproved 2013)
Standard Practice for
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Sampling of Gaseous Uranium Hexafluoride
This standard is issued under the fixed designation C1703; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
1.1 This practice covers methods for withdrawing represen-
tative sample(s) of uranium hexafluoride (UF ) during a
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2. Referenced Documents
transfer occurring in the gas phase. Such transfer in the gas
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2.1 ASTM Standards:
phase can take place from a mother cylinder, for example in an
autoclave to a receiving cylinder. It can also occur during the C761 Test Methods for Chemical, Mass Spectrometric,
Spectrochemical, Nuclear, and RadiochemicalAnalysis of
filling in the gas phase of a cylinder during a continuous
production process, for example centrifuge enrichment facility Uranium Hexafluoride
C787 Specification for Uranium Hexafluoride for Enrich-
or the distillation column in a conversion facility. Such
ment
sample(s) may be used for determining compliance with the
C996 Specification for Uranium Hexafluoride Enriched to
applicable commercial specification, for example Specification
235
Less Than 5 % U
C996 or Specification C787.
C1052 Practice for Bulk Sampling of Liquid Uranium
1.2 Since UF sampling is taken during the filling process,
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Hexafluoride
this practice does not address any special additional arrange-
2.2 Other Document:
ments that may be agreed upon between the buyer and the
ISO/DIS 7195 Packaging of Uranium Hexafluoride (UF )
seller when the sampled bulk material is being added to 6
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for Transport
residues already present in a container (“heels recycle”). Such
arrangements will be based on QA procedures such as trace-
3. Terminology
abilityofcylinderorigin(topreventforexamplecontamination
with irradiated material).
3.1 Definitions of Terms Specific to This Standard:
3.1.1 container—a vessel either holding or receiving by
1.3 If the receiving cylinder is purged after filling and
transfer, the UF to be sampled; it may consist of, for example,
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sampling, special verifications must be performed by the user
a fixed vessel in a UF handling plant or a cylinder to be used
to verify the representativity of the sample(s). It is then 6
for the transport of UF .
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expected that the results found on volatile impurities with gas
phase sampling may be conservative. 3.1.2 sample vessel—the small vessel into which the sample
of UF is withdrawn for analysis in the laboratory for charac-
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1.4 This practice is only applicable when the transfer occurs
terization. It can be a 1S or 2S bottle or a PCTFE
in the gas phase. When the transfer is performed in the liquid
(polydifluorodichloroethylene)/ PTFE (polytetrafluoroethyl-
phase, Practice C1052 should apply. This practice does not
ene) pot or tube or any other type of cylinder compatible with
apply to gas sampling after the cylinder has been filled since
UF .
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the sample taken will not be representative of the cylinder.
1.5 The scope of this practice does not include provisions
4. Summary of Practices
for preventing criticality incidents.
4.1 Two methods of withdrawing gas UF for sampling are
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1.6 This standard does not purport to address all of the
possible, namely: (1) continuous withdrawal using for example
safety concerns, if any, associated with its use. It is the
a capillary and producing only one sample, or (2) sequential
responsibility of the user of this standard to establish appro-
withdrawals producing a composite sample. Depending on the
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This practice is under the jurisdiction of ASTM Committee C26 on Nuclear For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Fuel Cycle and is the direct responsibility of Subcommittee C26.02 on Fuel and contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Fertile Material Specifications. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Jan. 1, 2013. Published January 2013. Originally the ASTM website.
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approved in 2008. Last previous edition approved in 2008 as C1703 – 08. DOI: Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
10.1520/C1703-08R13. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C1703−08 (2013)
pressure and temperature conditions during the transfer, the 7.1.1 It is recommended to va
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