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碘是核电站放射性源项的重要构成元素,其在严重事故环境下的化学反应,关系到放射性释放的剂量,所以碘化学反应的合理计算是严重事故安全分析的重要组成部分。MAAP和ASTEC作为严重事故分析程序在业界得到了广泛应用,本文分别介绍了它们的碘化学模型,并以有机碘的生成和分解为例,对这两种模型处理化学反应的方法进行了比较,研究结果可为使用该程序的相关模块提供理论指导,并对我国的严重事故一体化程序的开发有重要的参考意义。
Iodine is an important component of a radioactive source in a nuclear power plant. Its chemical reaction under serious accidental environment is related to the dose of radioactive release. Therefore, the rational calculation of iodine chemical reaction is an important part of the serious accident safety analysis. MAAP and ASTEC have been widely used in the industry as a serious accident analysis program. In this paper, their iodine chemistry models are introduced respectively. Taking the organic iodine generation and decomposition as examples, the methods of chemical reaction between the two models are compared. The results of the study can provide theoretical guidance for the relevant modules of the program and have important reference significance for the development of the serious accident integration program in our country.