1.1 本规程涵盖了提取浓缩六氟化铀（UF）样品的方法 6. )在气相转移期间和之后，以确定是否符合规范 C996 . 适用于运输超滤膜的填充 6. 容器（30B圆筒或1米 3. 垂直容器）放置在装有超滤的离心浓缩设施中 6. 符合规范 C787 . 1.2 自UF 6. 取样是在灌装过程中进行的，当将取样的散装材料添加到容器中已经存在的残留物中（“回收”）时，本惯例不涉及买方和卖方之间可能达成的任何特殊额外安排。 此类安排将基于QA程序，例如气瓶来源的可追溯性（以防止辐射材料污染）。 1.3 本规程仅适用于气相转移。当在液相中进行转移时，实践 C1052 应适用。 1.4 本规程的范围不包括预防危急事件的规定。 1.5 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 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、健康和环境实践，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 取代表性UF的标准方法 6. 从UF收集来自气缸的样本 6. 液相。通过基本指标，即铀同位素含量，获得材料的均匀性。由于外加剂和超滤膜的物理性质不同，通过其他指标（例如高挥发性外加剂（氟化硼、氟化硅、有机杂质）的含量）、产生非挥发性氟化物的外加剂对样品的代表性可能不令人满意 6. . 然而，这种取样在产品质量控制中得到了广泛应用，因为在填充原料和超滤的运输容器时都采用了液相过程 6. 丰富了一个。参考实践 C1052 对于UF 6. 液相取样规程。 5.2 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其特征（见ISO 7195:2005）。样品用于确定是否符合适用的商业规范 C996 . 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。UF可以使用这种做法 6. enrichers审查现有程序的有效性，或作为设备和程序设计的指南，以供将来使用。 5.3 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 the methods for withdrawing samples of enriched uranium hexafluoride (UF 6 ) during and after a transfer occurring in the gas phase in order to determine compliance with Specification C996 . It is applicable to the filling of a transport UF 6 container (30B cylinder or 1 m 3 vertical container) at a centrifuge enrichment facility that has been fed with UF 6 that complies with Specification C787 . 1.2 Since UF 6 sampling is taken during the filling process, this practice does not address any special additional arrangements that may be agreed upon between the buyer and the seller when the sampled bulk material is being added to residues already present in a container (“heels recycle”). Such arrangements will be based on QA procedures such as traceability of cylinder origin (to prevent, for example, contamination with irradiated material). 1.3 This practice is only applicable when the transfer occurs in the gas phase. When the transfer is performed in the liquid phase, Practice C1052 should apply. 1.4 The scope of this practice does not include provisions for preventing criticality incidents. 1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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, health, and environmental 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 The standard method for taking representative UF 6 sample from a cylinder is collecting from UF 6 liquid phase. Homogeneity of material is obtained by the basic indicator, that is, content of uranium isotope. Representativeness of a sample by other indicators such as content of highly volatile admixtures (boron fluoride, silicon fluoride, organic impurities), admixtures generating non-volatile fluorides may not be satisfactory owing to differences between physical properties of admixture and UF 6 . Nevertheless, such sampling is widely applied during the product quality control due to the fact that liquid phase process is applied when filling transport containers both for feedstock UF 6 and enriched one. Refer to Practice C1052 for UF 6 liquid phase sampling practice. 5.2 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 (see ISO 7195:2005). The samples are used to determine compliance with the applicable commercial Specification C996 . 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 can be used by UF 6 enrichers to review the effectiveness of existing procedures or as a guide to the design of equipment and procedures for future use. 5.3 It is emphasized that this practice is not meant to address conventional or nuclear criticality safety issues.