1.1 本规范涵盖核级、可烧结UO 2. 粉适用于UO 2. 含有任何铀（U）的粉末 235 核反应堆用核燃料芯块生产中的铀浓度。 1.2 本规范承认燃料循环中存在再处理铀，因此定义了商业级铀的同位素极限 2. . 此类商业级UO 2. 定义为，在燃料设计和制造方面，产品基本上等同于未加工的U.U 2. 超出这些限制不一定被视为等同，因此可能需要在燃料制造厂或燃料设计中作出特殊规定。 1.3 本规范不包括预防危急事故的规定或健康和安全要求。遵守本规范并不免除用户了解并遵守与拥有、运输、加工或使用源核材料或特殊核材料有关的所有国际、国家或联邦、州和地方法规的义务。 1.4 本规范明确提及UO 2. 在添加任何模具润滑剂、粘合剂或造孔剂之前使用粉末。如果粉末与此类添加剂一起出售或作为压榨饲料制备，则买方和卖方可能需要通过协议修改取样程序、允许杂质含量或粉末物理要求。 1.5 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。 1.6 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。

1.1 This specification covers nuclear-grade, sinterable UO 2 powder. It applies to UO 2 powder containing uranium (U) of any 235 U concentration in the production of nuclear fuel pellets for use in nuclear reactors. 1.2 This specification recognizes the presence of reprocessed U in the fuel cycle and consequently defines isotopic limits for commercial grade UO 2 . Such commercial grade UO 2 is defined so that, regarding fuel design and manufacture, the product is essentially equivalent to that made from unreprocessed U. UO 2 falling outside these limits cannot necessarily be regarded as equivalent and may thus need special provisions at the fuel fabrication plant or in the fuel design. 1.3 This specification does not include provisions for preventing criticality accidents or requirements for health and safety. Observance of this specification does not relieve the user of the obligation to be aware of and conform to all international, national, or federal, state, and local regulations pertaining to possessing, shipping, processing, or using source or special nuclear material. 1.4 This specification refers expressly to UO 2 powder before the addition of any die lubricant, binder, or pore former. If powder is sold with such additions or prepared as press feed, sampling procedures, allowable impurity contents, or powder physical requirements may need to be modified by agreement between the buyer and the seller. 1.5 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. 1.6 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.