[1J01-04] Behavior of Radioactive Nuclides

[1J01] Reaction of cesium hydroxide with iron oxides on stainless steels under simulated accident environment below 600℃

*Xin Tan¹, Kenta Murakami², Tatsuya Suzuki¹ (1. Nagaoka Univ. of Tech., 2. UTokyo)

Keywords:Cesium, Iron oxides, Chemical reaction, Low temperature zone

The reaction of CsOH with reactor structural materials may attenuate or delay the release to the environment under severe accident. Recent studies have shown reaction with stainless steel to form ferrite below 600 ℃. Besides, the oxide film on stainless steel in BWR environment normally has a double layer structure with Fe₃O₄ and Cr rich spinel. Therefore, the purpose of this study is to investigate the effects of various chemical factors on the reaction of CsOH with Fe₃O₄. Specimens with different molar ratio of Cs and Fe would be heated at 300-600℃ under both inert(Ar) and vapor(Ar-H₂O) atmospheres. XRD is used to identify the composition of specimens after heating.