1.1 本规范涵盖成品烧结和研磨（U，Pu）O 2. 用于轻水反应堆的颗粒。它适用于（U，Pu）O 2. 钚质量分数不超过15的芯块 % （即Pu的质量除以质量U、Pu和Am的总和，得出0.15或更小）。 1.2 根据本规范生产的球团有四个等级。 1.2.1 R级-- 240 Pu/（Pu+Am）同位素质量分数至少为19 %. 1.2.2 F级-- 240 Pu/（Pu+Am）同位素质量分数至少为7 % 且小于19 %. 1.2.3 N1级-- 240 Pu/（Pu+Am）同位素质量分数小于7 %. 1.2.4 N2级-- 240 Pu/ 239 钚同位素质量分数不超过0.10（10 %). 1.3 没有讨论或规定预防临界事故，也没有讨论健康和安全要求、避免危险或运输预防措施和控制措施。 遵守本规范并不免除用户了解并遵守与拥有、加工、运输或使用来源或特殊核材料有关的所有适用国际、联邦、州和地方法规的义务。美国政府文件的例子有《联邦法规》第10篇第50部分——生产和使用设施的国内许可证；《联邦法规》第10篇第71部分——放射性物质的包装和运输；以及《联邦法规》第49篇第173部分——装运和包装的一般要求。 1.4 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 1.5 以下安全隐患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）。本标准的使用者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》中确立的国际公认的标准化原则制定的。

1.1 This specification covers finished sintered and ground (U, Pu)O 2 pellets for use in light water reactors. It applies to (U, Pu)O 2 pellets containing a plutonium mass fraction up to 15 % (that is, mass of Pu divided by the sum of masses U, Pu, and Am yielding 0.15 or less). 1.2 Pellets produced under this specification are available in four grades. 1.2.1 Grade R— 240 Pu / (Pu + Am) isotope mass fraction is at least 19 %. 1.2.2 Grade F— 240 Pu / (Pu + Am) isotope mass fraction is at least 7 % and less than 19 %. 1.2.3 Grade N1— 240 Pu / (Pu + Am) isotope mass fraction is less than 7 %. 1.2.4 Grade N2— 240 Pu / 239 Pu isotope mass fraction does not exceed 0.10 (10 %). 1.3 There is no discussion of or provision for preventing criticality incidents, nor are health and safety requirements, the avoidance of hazards, or shipping precautions and controls discussed. Observance of this specification does not relieve the user of the obligation to be aware of and conform to all applicable international, federal, state, and local regulations pertaining to possessing, processing, shipping, or using source or special nuclear material. Examples of U.S. government documents are Code of Federal Regulations Title 10, Part 50—Domestic Licensing of Production and Utilization Facilities; Code of Federal Regulations Title 10, Part 71—Packaging and Transportation of Radioactive Material; and Code of Federal Regulations Title 49, Part 173—General Requirements for Shipments and Packaging. 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 safety hazards 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 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.