1.1 本规程涵盖了提取液态六氟化铀（UF）代表性样品的方法 6. )从散装材料中提取。然后根据惯例制备此类样品以进行进一步的分析测试 C1689 和 C1346 . 使用多种不同的方法来确定是否符合适用的商业规范，例如规范 C787 和 C996 . 符合这些标准的方法可在各规范的参考文件部分找到。 1.2 假设散装液体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可能需要的任何特殊额外安排。将取样的散装材料添加到UF时 6. 已在容器中的残留物（“脚跟回收”）需要额外安排，以避免散装UF的交叉污染 6. ，这些在规范中有说明 C787 和 C996 . 1.3 取样数量、标称样品重量及其处置应由双方商定。 1.4 本规程的范围不包括预防危急事件的规定。 1.5 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、健康和环境实践，并确定监管限制的适用性。 1.6 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20吨），因此必须通过参考代表性样品来表征。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设计的设备。本规程说明了目前用于液体超滤膜批量取样的适当原理、设备和程序 6. . UF使用 6. 转换器、浓缩器和燃料制造商审查现有程序的有效性，或作为设备设计和未来使用程序的指南。 5.2 需要强调的是，该实践并非旨在解决常规或核临界安全问题。

1.1 This practice covers methods for withdrawing representative samples of liquid uranium hexafluoride (UF 6 ) from bulk quantities of the material. Such samples are then prepared for further analytical testing in accordance with Practices C1689 and C1346 . Multiple different methods are used for determining compliance with the applicable commercial specification, for example Specifications C787 and C996 . Methods used for compliance to each of these standards can be found in the Referenced Documents section of each respective specification. 1.2 It is assumed that the bulk liquid UF 6 being sampled comprises a single quality and quantity of material. This practice does not address any special additional arrangements that might be required for taking proportional or composite samples. When the sampled bulk material is being added to UF 6 residues already in a container (“heels recycle”) additional arrangements are required to avoid cross contamination of the bulk UF 6 , these are addressed in Specifications C787 and C996 . 1.3 The number of samples to be taken, their nominal sample weight, and their disposition shall be agreed upon between the parties. 1.4 The scope of this practice does not include provisions for preventing criticality incidents. 1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 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 20-ton) quantities and must, therefore, be characterized by reference to representative samples. The quantities involved, physical properties, chemical reactivity, and hazardous nature of UF 6 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 indicates appropriate principles, equipment, and procedures currently in use for bulk sampling of liquid UF 6 . It is used by UF 6 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 It is emphasized that this practice is not meant to address conventional or nuclear criticality safety issues.