1.1 本规程适用于六氟化铀（UF）的二次采样 6. )，使用热液化技术，从散装容器中获得，符合实践要求 C1052 , C1703 和 C1883 ，放入实验室分析所需的较小样品容器中。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 假设液体UF 6. 抽样包括单一质量和数量的材料。 本规程不涉及采集比例或复合样本时可能需要的任何特殊额外安排。 1.4 取样数量、标称样品重量及其处置应由双方商定。 1.5 本规程的范围不包括预防危急事件的规定。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 六氟化铀通常大量生产和处理（通常为1至14吨），因此必须通过参考代表性样品来表征。 样品用于确定是否符合适用的商业规范 C996 和 C787 通过适当的测试方法（例如，测试方法 C761 以及其中的参考文件）。超滤涉及的数量、物理性质、化学反应性和危险性质 6. 因此，对于代表性采样，必须按照最仔细控制和最严格的程序使用和操作专门指定的设备。本规程说明了当前用于液体超滤二次采样的适当原理、设备和程序 6. . UF使用 6. 变流器、浓缩器和燃料制造商审查现有程序的有效性或设计设备和程序以供将来使用。其他子采样程序，如UF 6. 蒸汽取样不能直接代表液体超滤的化学质量 6. . 5.2 需要强调的是，本测试指南不是为了解决常规或核临界安全问题，也不是为了解决子样本管的调节问题，以使其适合运输。

1.1 This practice is applicable to subsampling uranium hexafluoride (UF 6 ), using heat liquefaction techniques, from bulk containers, obtained in conformance with Practices C1052 , C1703 , and C1883 , 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. 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. ====== 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 C996 and C787 by means of the appropriate test method (for example, Test Method C761 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 . 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.