ASTM C1346-08
(Practice)Standard Practice for Dissolution of UF6 from P-10 Tubes
Standard Practice for Dissolution of UF<sub>6</sub> from P-10 Tubes
SIGNIFICANCE AND USE
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 and metallic impurities in Specification C 787 and C 996. This practice results in the complete dissolution of the sample for uranium and impurities analysis, and determination of isotopic distribution by mass spectrometry as described in, for example, Test Methods C 761.
SCOPE
1.1 This practice covers the dissolution of UF6 from a P-10 tube to provide solutions for analysis.
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 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. For specific safeguard and safety precaution statements, see Section 8.
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Designation: C1346 − 08
StandardPractice for
1,2
Dissolution of UF from P-10 Tubes
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This standard is issued under the fixed designation C1346; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope gasket to cover the tube’s opening, and a nut and plug (Monel
or SS) to seal the gasket to the tube.
1.1 This practice covers the dissolution of UF from a P-10
6
tube to provide solutions for analysis.
3.2 The UF tube is weighed, cooled in liquid nitrogen, and
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quickly opened and immersed in water for dissolution. The
1.2 The values stated in SI units are to be regarded as
pieces of the tube’s assembly are removed from the resulting
standard. No other units of measurement are included in this
solution,rinsed,dried,reassembled,andweighed.Thesolution
standard.
is dried for gravimetric conversion to U O , or diluted to an
3 8
1.3 This standard does not purport to address all of the
appropriate concentration for dispensing into aliquots for
safety concerns, if any, associated with its use. It is the
subsequent analysis.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Significance and Use
bility of regulatory limitations prior to use. For specific
safeguard and safety precaution statements, see Section 8. 4.1 Uraniumhexafluorideisabasicmaterialusedtoprepare
nuclearreactorfuel.Tobesuitableforthispurposethematerial
2. Referenced Documents
must meet criteria for uranium content, isotopic composition
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and metallic impurities in Specification C787 and C996. This
2.1 ASTM Standards:
practice results in the complete dissolution of the sample for
C761Test Methods for Chemical, Mass Spectrometric,
uranium and impurities analysis, and determination of isotopic
Spectrochemical,Nuclear,andRadiochemicalAnalysisof
distributionbymassspectrometryasdescribedin,forexample,
Uranium Hexafluoride
C787Specification for Uranium Hexafluoride for Enrich- Test Methods C761.
ment
C996Specification for Uranium Hexafluoride Enriched to 5. Apparatus
235
Less Than 5 % U
5.1 Steam bath, in a hood, if optional step 9.2.13 is used.
D1193Specification for Reagent Water
5.2 Vacuum oven, if option 2 of 9.2.14 is used. The oven
3
3. Summary of Practice
should be adjustable to 80°C at an absolute pressure of 3 ×10
Pa.
3.1 UF samples intended for analysis are packaged in P-10
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tubes to prevent sublimation and reaction with moisture in the
5.3 Dewar flask, wide-mouth.
air. The P-10 tube assembly (Fig. 1) consists of a Polychloro-
5.4 Vise, small lab-bench model or similar type of holder.
trifluoroethylene (PCTFE) tube containing the UF , a PCTFE
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15
5.5 Wrench, ⁄16 in.
1
This practice is under the jurisdiction of ASTM Committee C26 on Nuclear
5.6 Plastic clamping forceps, 12 to 13 cm long, with a
Fuel Cycle and is the direct responsibility of Subcommittee C26.05 on Methods of
claw-likebenttip,tosecurelyholdthecylindricalPCTFEtube.
Test.
CurrenteditionapprovedJune1,2008.PublishedJuly2008.Originallyapproved
NOTE 1—These forceps are not commercially available. Bend the ends
in 1996. Last previous edition approved in 2002 as C1346–02. DOI: 10.1520/
of a straight-tip forceps by heating over a moderate flame, shaping, and
C1346-08.
maintaining the shape until cool.
2
Polychlorotrifluoroethylene P-10 tubes are widely accepted by the industry for
subsample collection and subsequent UF quality analyses or dispatch to the
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5.7 TFE-fluorocarbon-coated spatula, 0.5- to 1-cm wide at
customer. The procedure for subsample collection and dissolution can also be used
its flat end, optional.
for other types of subsample tubes, for example, P-20, P-80 or P-100 , in that case
the amount of water has to be adjusted to ensure complete hydrolisation of UF and
6
5.8 Platinum or PCTFE rod, optional.
avoid excessive heat evolution.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.9 Platinum dishes or plastic beakers with compatible HF
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
resistance (typically PolyEthylene; PE), large enough to con-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tain a completely submerged P-10 tube.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C1346 − 08
adequate laboratory facilities and fume hoods along with safe
techniques must be used in handling samples containing these
materials.Adetailed discussion of all necessary precautions is
beyond the
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:C1346–02 Designation: C 1346 – 08
Standard Practice for
,
1 2
Dissolution of UF from P-10 Tubes
6
This standard is issued under the fixed designation C 1346; 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
1.1 This practice covers the dissolution of UF from a P-10 tube to provide solutions for analysis.
6
1.2
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 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. For specific safeguard and safety precaution statements, see Section 8.
2. Referenced Documents
3
2.1 ASTM Standards:
C 761 Test Methods for Chemical, Mass Spectrometric, Spectrochemical, Nuclear, and Radiochemical Analysis of Uranium
Hexafluoride
2
C 787Specification for Uranium Hexafluoride for Enrichment Specification for Uranium Hexafluoride for Enrichment
235
C 996 Specification for Uranium Hexafluoride Enriched to Less Than 5 % U
D 1193 Specification for Reagent Water
3. Summary of Practice
3.1 UF samples intended for analysis are packaged in P-10 tubes to prevent sublimation and reaction with moisture in the air.
6
The P-10 tube assembly (Fig. 1) consists of a Polychlorotrifluoroethylene (PCTFE) tube containing the UF , a fluorothenePCTFE
6
gasket to cover the tube’s opening, and a Monel nut and plug (Monel or SS) to seal the gasket to the tube.
3.2 The UF tube is weighed, cooled in liquid nitrogen, and quickly opened and immersed in ice-cold water for dissolution.The
6
pieces of the tube’s assembly are removed from the resulting solution, rinsed, dried, reassembled, and weighed. The solution is
dried for gravimetric conversion to U O , or diluted to an appropriate concentration for dispensing into aliquantsaliquots for
3 8
subsequent analysis.
4. 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, composition and partially
substituted halohydrocarbon content metallic impurities in Specification C 787 and C 996. This practice results in the complete
dissolutionofthesampleforuraniumandimpuritiesanalysis,anddeterminationofisotopicdistributionbythermalionizationmass
spectrometry as described in, for example, Test Methods C 761. Highly volatile impurities should be determined directly on UF .
6
5. Apparatus
5.1 Steam bath, in a hood, if optional step 9.2.13 is used.
5.2 Vacuum oven, if option 2 of 9.2.16 is used. The oven should be adjustable to 80°C at a pressure of -29 in. of Hg. 9.2.14
1
This practice is under the jurisdiction of ASTM Committee C26 on Nuclear Fuel Cycle and is the direct responsibility of Subcommittee C26.05 on Methods of Test.
Current edition approved Jan. 10, 2002. Published April 2002. Originally published as C1346–96. Last previous edition C1346–96
Current edition approved June 1, 2008. Published July 2008. Originally approved in 1996. Last previous edition approved in 2002 as C 1346 – 02
2
Annual Book of ASTM Standards, Vol 12.01.
2
Polychlorotrifluoroethylene P-10 tubes are widely accepted by the industry for subsample collection and subsequent UF quality analyses or dispatch to the customer.
6
The procedure for subsample collection and dissolution can also be used for other types of subsample tubes, for example, P-20, P-80 or P-100 , in that case the amount of
water has to be adjusted to ensure complete hydrolisation of UF and avoid excessive heat evolution.
6
3
Reagent Chemicals, American Chemical Society Specifications, American Chemical Society, Washington, DC. For suggestions on the testing of reagents not listed by
the American Chemical Society, see Analar Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia and National
Formulary, U.S. Pharmaceutical Convention, Inc. (USPC), Rockville, MD.
3
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standa
...
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