ASTM C787-20 PDF
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St ASTM C787-20
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Ст ASTM C787-20
Original standard ASTM C787-20 in PDF full version. Additional info + preview on request
Full title and description
ASTM C787-20 — Standard Specification for Uranium Hexafluoride for Enrichment. This specification establishes impurity and isotopic composition limits and related requirements for uranium hexafluoride (UF6) used as feedstock to enrichment plants, including provisions for UF6 derived from unirradiated natural uranium and from reprocessed uranium intended for reuse in enrichment processes.
Abstract
This specification covers uranium hexafluoride (UF6) intended for feeding to an enrichment plant. It defines impurity and uranium isotope limits for commercial natural UF6 feedstock and additional limits for reprocessed UF6 (or mixtures of reprocessed and commercial natural UF6). The document notes that compliance with the specification does not replace obligations to follow health, safety, criticality, transport, and regulatory requirements.
General information
- Status: Active / Published (current edition in force).
- Publication date: Published (document effective 01-Mar-2020; publication metadata shows 29-Feb-2020 / March 2020 edition).
- Publisher: ASTM International.
- ICS / categories: ICS 27.120.30 (Fissile materials and nuclear fuel technology).
- Edition / version: Designation C787-20 (current edition C787−20; ASTM product listing shows C0787-20 and related reapproval markers).
- Number of pages: 4 pages.
Scope
The standard applies to uranium hexafluoride (UF6) intended for feeding to uranium enrichment plants. It includes specifications for UF6 from unirradiated natural uranium and for UF6 derived from reprocessed (irradiated and reprocessed) uranium converted to UF6 for enrichment and reuse. The specification’s objectives are to define impurity and uranium isotope limits for commercial natural UF6 and to define additional limits and special provisions for reprocessed UF6 or mixtures containing reprocessed UF6. The scope explicitly notes that it does not comprehensively address criticality prevention, health and safety, or shipping regulations, and that users must comply with applicable regulatory requirements.
Key topics and requirements
- Defined impurity limits for uranium hexafluoride feedstock (chemical impurities and fission/decay products).
- Uranium isotopic composition requirements and limits for commercial natural UF6 and additional limits for reprocessed UF6 (including controls on specific isotopes and isotope ratios).
- References to analytical and test methods (e.g., ASTM test methods and practices for chemical and isotopic analysis of UF6 and for bulk sampling and assay) required to verify compliance.
- Specification of SI units as standard and guidance on units provided for information.
- Notes that special provisions may be required to address hazards to personnel, equipment, or environment when reprocessed UF6 is involved.
Typical use and users
This specification is used by uranium conversion and enrichment facilities, UF6 producers and suppliers, nuclear fuel fabricators, analytical laboratories performing isotopic and chemical analysis of uranium compounds, regulatory and compliance personnel, and procurement teams specifying acceptable UF6 feedstock quality for enrichment processes. It supports contractual specifications and quality assurance for feedstock material.
Related standards
Standards commonly referenced with C787 include ASTM test methods and practices for UF6 analysis and sampling such as C761 (chemical and isotopic analysis methods for UF6), C996 (specification for UF6 enriched to less than 5% 235U), C1052 (practice for bulk sampling of liquid UF6), C1703 (sampling of gaseous UF6 for enrichment), and related isotope-analysis test methods and guides. These referenced documents provide the analytical, sampling, and complementary specifications needed to implement C787 requirements.
Keywords
Uranium hexafluoride, UF6, enrichment feedstock, isotopic composition, impurities, reprocessed uranium, nuclear fuel, uranium specification, sampling, isotopic analysis.
FAQ
Q: What is this standard?
A: ASTM C787-20 is the ASTM standard specification that sets impurity and isotopic composition limits and related requirements for uranium hexafluoride (UF6) intended as feedstock to enrichment plants.
Q: What does it cover?
A: It covers UF6 from unirradiated natural uranium and UF6 derived from reprocessed uranium converted to UF6 for enrichment, specifying impurity limits, isotope limits, referenced analytical methods, and notes on safety/transport/regulatory obligations (which it does not fully replace).
Q: Who typically uses it?
A: Users include UF6 suppliers, conversion and enrichment facilities, nuclear fuel cycle laboratories, procurement and quality assurance teams, and regulators or auditors concerned with feedstock composition and acceptable impurity/isotope levels.
Q: Is it current or superseded?
A: The C787-20 edition is the current (active) edition. The document was approved/issued in early March 2020 (effective 01-Mar-2020); ASTM product metadata also shows reapproval/active markers in later tracker entries. Check ASTM International for the authoritative current status and any subsequent reapprovals.
Q: Is it part of a series?
A: C787 is part of ASTM Committee C26 (Nuclear Fuel Cycle) outputs and is linked to several companion standards and test methods that govern UF6 sampling and analysis (for example C761, C996, C1052, C1703 and others).
Q: What are the key keywords?
A: Key keywords are: uranium hexafluoride, UF6, enrichment, isotopic composition, impurities, reprocessed uranium, nuclear fuel, sampling, isotopic analysis.