1.1 本规范涵盖核级铀金属，这些金属要么通过浓缩厂加工，要么通过高浓缩铀与其他铀混合生产，以获得任何类型的铀 235 U质量分数低于20 % 这是用于研究反应堆和第四代核反应堆燃料制造的。本规范的范围包括商业天然铀、再加工铀或高浓缩铀衍生的浓缩铀金属规范。 商业天然铀、再加工铀和高浓缩铀的定义见第节 3. . 本规范的目的是定义商业级浓缩铀金属的杂质和铀同位素限值。 1.2 本规范旨在为核工业提供用于生产研究反应堆和第四代核反应堆燃料的浓缩铀金属标准。除本规范外，有关各方可同意其他适当条件。 1.3 本规范的范围并不全面涵盖预防临界事故的所有规定或健康安全或运输要求。遵守本标准并不免除用户遵守所有适用的国际、联邦、州和地方法规的义务，以处理、运输或以任何其他方式使用铀金属（例如，参见， C996 关于参考）。 1.4 以国际单位制表示的数值应视为标准值。 国际单位制后括号中给出的值仅供参考，不被视为标准值。 1.5 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。

1.1 This specification covers nuclear grade uranium metal that has either been processed through an enrichment plant, or has been produced by the blending of highly enriched uranium with other uranium, to obtain uranium of any 235 U mass fraction below 20 % and that is intended for research reactor and generation IV nuclear reactor fuel fabrication. The scope of this specification includes specifications for enriched uranium metal derived from commercial natural uranium, reprocessed uranium, or highly enriched uranium. Commercial natural uranium, reprocessed uranium and highly enriched uranium are defined in Section 3 . The objectives of this specification are to define the impurity and uranium isotope limits for commercial grade enriched uranium metal. 1.2 This specification is intended to provide the nuclear industry with a standard for enriched uranium metal which is to be used in the production of research reactor and generation IV nuclear reactor fuel. In addition to this specification, the parties concerned may agree to other appropriate conditions. 1.3 The scope of this specification does not comprehensively cover all provisions for preventing criticality accidents or requirements for health and safety or for shipping. Observance of this standard does not relieve the user of the obligation to conform to all applicable international, federal, state, and local regulations for processing, shipping, or any other way of using uranium metal (see, for example, C996 regarding references). 1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.5 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.