1.1 本规范适用于成品烧结UO 2. 颗粒。适用于UO 2. 含有任何铀（U）的芯块 235 用于核反应堆的铀浓度。 1.2 本规范承认燃料循环中存在再处理铀，因此定义了铀的同位素极限 2. 由商品级UO制成的颗粒 2. .此类商业级UO 2. 定义为，在燃料设计和制造方面，该产品基本上等同于未经辐照的铀 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( 一 )预防临界事故的规定( b )健康和安全要求( c )避免危险，或( d )运输注意事项和控制。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联邦、州和地方法规的义务。 美国政府文件的示例包括《联邦法规》（最新版）、第10篇第50部分、第10篇第70部分、第10篇第71部分和第49篇第173部分。 1.4 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。 1.5 以下预防性警告仅适用于技术要求部分第节 4. ，本规范: 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，并确定适用性或监管限制。 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。

1.1 This specification is for finished sintered UO 2 pellets. It applies to UO 2 pellets containing uranium (U) of any 235 U concentration 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 UO 2 pellets made from 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 unirradiated 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 ( a ) provisions for preventing criticality accidents, ( b ) requirements for health and safety, ( c ) avoidance of hazards, or ( d ) shipping precautions and controls. Observance of this specification does not relieve the user of the obligation to be aware of and conform to all federal, state, and local regulations pertaining to possessing, shipping, processing, or using source or special nuclear material. Examples of U.S. Government documents are Code of Federal Regulations (Latest Edition), Title 10, Part 50, Title 10, Part 70, Title 10, Part 71, and Title 49, Part 173. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 The following precautionary caveat pertains only to the technical requirements portion, Section 4 , of this specification: 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 or 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.