核设施气载放射性流出物取样新标准的分析与应用

Analysis and Implement of New Standard on Airborne Effluent Sampling of Nuclear Facilities

介绍了新版标准ISO 2889-2010《核设施的烟囱和通风管道中的放射性物质取样》产生的背景和主要内容,该标准推荐在气体充分混合的区域,采用单嘴取样器,对核设施气载流出物进行取样,同时要求取样系统对空气动力学直径为10μm的气溶胶粒子的传输比不小于50%,这与旧版标准的要求产生了较大变化。将该标准与相应的美国国家标准进行了对比分析,同时讨论了新标准的实施方法和应用现状。

New ISO standard 〈 Sampling airborne radioactive materials from the stacks and ducts of nuclear facilities 〉, which is different from the previous standard, suggests adopting Single - Point probe for airborne effluent sampling of nuclear facilities. The probe should be disposed where the fluid is in good mixing. In addition, the new standard requests the transmission ratio of sampling system should not less than 50% for 10 μm aerodynamic equivalent diameter （AED） aerosol particle. The background and main content of the new stand- ard are introduced, and the new standard is contrasted with ANSI/HPS N13.1 -1999. Moreover, the imple- ment method and actuality of the new standard is discussed.