Experimental Study on Transport Behavior of Cesium Iodide in the Reactor Coolant System under LWR Severe Accident Conditions

Naoya Miyahara, Shuhei Miwa, Mélany Gouëllo, Junpei Imoto, Naoki Horiguchi, Isamu Sato, Masahiko Osaka

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    Abstract

    In order to clarify the CsI transport behavior with a focus on the mechanisms of gaseous iodine formation in the reactor coolant system of LWR under a sever accident condition, a reproductive experiment of CsI transport behavior was conducted using a facility equipped with a temperature gradient tube. Various analyses on deposits and airborne materials during transport could elucidate two mechanisms for the gaseous iodine formation. One was the gaseous phase chemical reaction in Cs-I-O-H system at relatively high temperature region, which led to gaseous iodine transport to the lower temperature region without any further changes in gas species due to the kinetics limitation effects. The other one was newly found in this study, which is the chemical reaction between condensed phase of CsI on walls or in the aerosol particles with steam to form Cs oxides with the release of gaseous iodine.
    Original languageEnglish
    JournalNuclear Materials and Energy
    Publication statusSubmitted - 2019
    MoE publication typeA1 Journal article-refereed

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    Miyahara, N., Miwa, S., Gouëllo, M., Imoto, J., Horiguchi, N., Sato, I., & Osaka, M. (2019). Experimental Study on Transport Behavior of Cesium Iodide in the Reactor Coolant System under LWR Severe Accident Conditions. Manuscript submitted for publication.