1.1 本标准涵盖了用于从气流中去除气态放射性碘物种的原始浸渍活性炭的物理特性和性能要求规范。 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 核反应堆安全壳系统中使用的活性炭必须能够在正常运行条件和设计基准事故（DBA）后可能存在的条件下运行。 作为再循环系统一部分的吸附床 在…内 安全壳可能暴露在DBA后状态的峰值压力、温度和蒸汽含量下。 5.2 碳床 外部 安全壳将由快速作用截止阀保护，以防DBA后安全壳大气的压力、温度和湿度突然升高。然而，如果在初始压力升高（由于蒸汽逸出到安全壳体积）被安全壳冷却器降低后，将其重新连接到安全壳，即使安全壳外的床也会出现温度和湿度上升。可以想象的是，可以到达任何一种吸附系统的放射性量都相当高；因此，床温有可能因衰变加热而升高。 最令人感兴趣的气体放射性污染物是有机碘化物。在本测试中，CH 3. I通常用于表征碳对有机碘化合物的性能。本文描述的测试提供了活性炭在正常和DBA后条件下对有机碘有效性的合理图片。所述设备和方法可酌情用于不同气流条件下的类似试验，并在一定程度上用于不同的气体放射性污染物和其他吸附剂。

1.1 This standard covers the specifications for physical properties and performance requirements of virgin impregnated activated carbon to be used for the removal of gaseous radioiodine species from gas streams. 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 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 Activated carbons used in containment systems for nuclear reactors must be capable of functioning under both normal operating conditions and those conditions which may exist following a design basis accident (DBA). Adsorbent beds that are part of recirculatory systems inside containment may be exposed to the peak pressure, temperature, and steam content of a post-DBA condition. 5.2 Carbon beds outside containment will be protected by fast-acting shutoff valves from the sudden rise in pressure, temperature, and humidity of the containment atmosphere which would exist following a DBA. However, some rise in temperature and humidity will be experienced even by beds outside containment if they are reconnected to containment after the initial pressure rise (due to escape of steam into the containment volume) has been reduced by containment coolers. The amount of radioactivity that can reach either type of adsorption system is conceivably quite high; hence, there is a possibility of a bed temperature rise due to decay heating. The gaseous radioactive contaminants of most interest are organic iodides. In this test, CH 3 I is used to typify the performance of the carbon on organic iodine compounds in general. The test described here provide a reasonable picture of the effectiveness of an activated carbon for organic iodides under normal and post-DBA conditions. The equipment and methods described can be used, with discretion, for similar tests at different gas flow conditions and, to some extent, on different gaseous radioactive contaminants and other adsorbents.