Abstract CsI and CdI2 aerosol decomposition rate under irradiation has been quantified at 80 °C and 120 °C in presence of humidity and on different substrate (stainless steel, quartz and Epoxy paint). A model has been developed for the ASTEC-SOPHAEROS code to reproduce the data and help the identification of the gaps remaining in the understanding of iodine volatility in a severe accident of a Nuclear Power Plant (NPP). The current model applied to model the gaseous iodine behaviour in the containment of PHEBUS-FP tests does not fit with the experimental data probably because the nuclear aerosol reaching the containment are much more complex than pure CsI aerosols. It has been clearly shown than the radiolytic oxidation of metallic iodide aerosols into molecular iodine can significantly impact the source term evaluation even if additional experimental data area required to cover the variety and complexity of nuclear iodide aerosols.

中文翻译：

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沉积在不锈钢、石英和环氧树脂漆表面上的 CsI 和 CdI2 气溶胶的辐射分解研究

摘要 CsI 和 CdI2 气溶胶在辐照下的分解率已在 80 °C 和 120 °C 下，在湿度存在的情况下，在不同的基材（不锈钢、石英和环氧树脂涂料）上进行量化。已经为 ASTEC-SOPHAEROS 代码开发了一个模型，以重现数据并帮助确定在理解核电厂 (NPP) 严重事故中碘挥发性方面存在的差距。当前用于模拟 PHEBUS-FP 测试安全壳中的气态碘行为的模型与实验数据不符，可能是因为到达安全壳的核气溶胶比纯 CsI 气溶胶复杂得多。