离子碘向元素碘转化行为模型研究

Study on Models for the Conversion Behavior of Iodine Ions to Elemental Iodine in Aqueous Solutions

在辐照条件下,溶液中会发生离子碘(I−)向元素碘(I2)的转化现象,导致I2从溶液中挥发出来,从而对事故源项产生重要影响,该现象在核电厂的事故源项分析中得到了极大的关注。本文对无辐照条件、辐照条件的碘化学模型进行了归纳总结,对美国核管会NUREG/CR-5950中的公式推导及反应率常数进行了介绍,可用于支持确定论事故后果分析,最后给出了总结和后续研究建议。

Radiolytic conversion of iodine ions (I−) to elemental iodine (I2) occurs in aqueous solutions under radiation, resulting in the escape of I2 from the solution. This phenomenon could influence the accident source term significantly so that it has to be considered seriously when performing accident source term analysis. In this paper, the iodine chemical model without irradiation condition and irradiation condition is summarized. The formula promotion and reaction rate constant in NUREG/CR-5950 of Nuclear Regulatory Commission of the United States are introduced, which can be used to support deterministic accident consequence analysis. Finally, a summary and suggestions for further research are given.