熔堆事故下有机碘形成、滤除排放与蒸汽环境模拟  

Organic iodine formation,filtration emission,and steam environment simulation under core melt accident

作　　者：高琳锋[1] 梁俊钦 姚岩岩 赵高昕 陈欣 常森 李昕 GAO Linfeng;LIANG Junqin;YAO Yanyan;ZHAO Gaoxin;CHEN Xin;CHANG Sen;LI Xin(China Institute for Radiation Protection,Taiyuan 030006;CGN Huizhou Nuclear Power Co.Ltd.,Guangdong Huizhou 516003;Yangjiang Nuclear Power Co.Ltd.,Guangdong Yangjiang 529941)

机构地区：[1]中国辐射防护研究院,太原030006 [2]中广核惠州核电有限公司,广东惠州516003 [3]阳江核电有限公司,广东阳江529941

出　　处：《辐射防护》2023年第6期576-585,共10页Radiation Protection

摘　　要：核电厂发生冷却剂损失事故导致堆芯熔化时,核燃料中的放射性碘会随冷却剂释放到安全壳内形成含碘高温高压蒸汽环境。在自然作用与人工干预(喷淋等)下,碘物理与化学形态逐渐发生变化,在长期阶段形成有机碘占主导地位的气态碘环境。本文简述了核电厂事故工况有机碘的形成及滤除排放工艺并开展了有机碘蒸汽环境模拟研究。通过定量汽化与多重控制实现了典型事故工况参数(130℃、399 kPa、95%rh)为代表的有机碘蒸汽环境宽范围精确模拟。含碘蒸汽环境模拟可用于在役吸附剂有机碘滤除性能检测与新型吸附剂开发,在事故工况下对有机碘的滤除与可控排放方面具有一定的作用。When nuclear power plant coolant loss accident leads to core melting,radioactive iodine in nuclear fuel will be released into the containment with coolant and will form high temperature and high pressure steam environment.Under natural action and artificial intervention(spraying,etc.),the physical and chemical forms of iodine gradually change,forming a gaseous iodine environment dominated by organic iodine in the long-term stage.In this paper,the formation and filtration process of organic iodine in accident condition of nuclear power plant are described and the simulation of organic iodine vapor environment is carried out.By quantitative vaporization and multiple control,a wide-range of accurate simulation of organic iodine vapor environment represented by typical accident operating parameters(130℃,399 kPa,95%RH)was achieved.The simulation of iodine-containing steam environment can be used for the detection of organic iodine filtration performance of in-service adsorbents and the development of new adsorbents,which is of great significance in organic iodine filtration and controlled discharge under accident conditions at nuclear power plant.

关 键 词：事故工况 有机碘滤除 环境模拟 高温蒸汽 湿度监测 

分 类 号：TL732[核科学技术—辐射防护及环境保护]