Significance and Use

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 C 996 and C 787 by means of the appropriate test method (for example, Test Method C 761 and references therein). The quantities involved, physical properties, chemical reactivity, and hazardous nature of UF ₆ 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 UF ₆ . It is used by UF ₆ 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 UF ₆ vapor sampling are not directly representative of the chemical quality of liquid UF ₆ .

It is emphasized that this test guide is not meant to address conventional or nuclear criticality safety issues.

1. Scope

1.1 This practice is applicable to subsampling uranium hexafluoride (UF ₆ ), using heat liquefaction techniques, from bulk containers, obtained in conformance with C 1052 , 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 UF ₆ 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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

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

Keywords

subsampling; uranium hexafluoride; Uranium; Uranium hexafluoride (UF 6 );

ICS Code

ICS Number Code 27.120.30 (Fissile materials and nuclear fuel technology)

DOI: 10.1520/C1689-08A

ASTM International is a member of CrossRef.

ASTM C1689