[3G06-08] Behavior of Radioactive Nuclides & Fuel Debris 2

[3G06] Study on revaporization of deposited CsI from stainless steel 304 surface in high-temperature steam atmosphere

*Muhammad Rizaal¹, Shuhei Miwa¹, Eriko Suzuki¹, Jumpei Imoto¹, Masahiko Osaka¹, Mélany Gouëllo² (1. Japan Atomic Energy Agency, 2. VTT Technical Research Centre of Finland)

Keywords:Cesium iodide, revaporization, high-temperature steam, Cs2CrO4

We experimentally investigated the revaporization behavior of deposited CsI on the surface of structural material such as stainless steel in a subsequent high-temperature steam flow (i.e., reflood of the reactor at severe accident). The experimental results showed that the deposited CsI at 850K could be vaporized, leaving the formation of Cs₂CrO₄ on that once-deposited surface and consequently giving an increase of iodine release observed below 400K.