1.1 本试验方法包括测定核级铀和钚混合氧化物（（U，Pu）O）中的氢 2. )烧结燃料芯块。本试验方法是试验方法的替代方法 C698型 用于测定核级烧结混合氧化物（MOX）燃料芯块中的水分。试验方法 C698型 描述了使用库仑电解水分分析仪检测混合氧化物中的水分。虽然H的主要来源 2. 燃料颗粒中有水分，可能还有其他来源。MOX颗粒规格 C833 指定所有来源的氢的限制，而不仅仅是水分。本试验方法中规定的惰性气体熔合和热导检测器允许检测所有来源的氢气。因此，该试验方法可用于确定 C833 . 1.2 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。 1.3 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和健康实践，并确定监管限制的适用性。 1.4 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 MOX用作核反应堆燃料。本试验方法旨在确定颗粒的氢含量是否符合燃料规范的要求。 规范中给出了这些要求的示例 C833 . 根据供应商和客户之间的协议，其他要求可能适用。 5.2 该方法适用于PuO含量高达15%的所有烧结MOX颗粒 2. 当UO 2. 和PuO 2. 满足规范要求 C753 和 C757 . 方法不确定度与样品中的氢浓度有关。在较低浓度下，相对不确定性增加。在氢含量接近典型氢含量规范极限时（1.3μg氢/g铀+钚金属）；95%时的综合相对不确定度 % 置信水平（k=2）约为30 %.

1.1 This test method covers the determination of hydrogen in nuclear-grade mixed oxides of uranium and plutonium ((U, Pu)O 2 ) sintered fuel pellets. This test method is an alternative to Test Method C698 for the determination of moisture in nuclear-grade sintered mixed oxide (MOX) fuel pellets. Test Method C698 describes the detection of moisture in mixed oxides using a coulometric, electrolytic moisture analyzer. Although the main source of H 2 in the fuel pellets is moisture, there could be other sources. The MOX pellet Specification C833 specifies a limit for hydrogen from all sources, not only moisture. The inert gas fusion followed by thermal conductivity detector specified in this test method allows for detection of hydrogen from all sources. Therefore, this test method can be used to determine the limit specified in C833 . 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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 and health practices and determine the applicability of regulatory limitations prior to use. 1.4 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 MOX is used as a nuclear-reactor fuel. This test method is designed to determine whether the hydrogen content of the pellets meet the requirements of fuel specification. Examples of these requirements are given in Specification C833 . Other requirements may apply based on agreements between the supplier and the customer. 5.2 This method is suitable for all sintered MOX pellets containing up to 15 weight % PuO 2 when the UO 2 and PuO 2 meet the requirements of Specifications C753 and C757 . The method uncertainty is related to the concentration of the hydrogen in the sample. At lower concentrations, the relative uncertainty increases. At hydrogen contents close to the typical hydrogen content specification limit (1.3 μg hydrogen/g U + Pu metal); the combined relative uncertainty at the 95 % confidence level (k = 2) is approximately 30 %.