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Report No.
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Chemical form estimation of in-vessel fuel debris by thermodynamic calculation with melt progression analysis

Ikeuchi, Hirotomo ; Noguchi, Yoshihiro*; Kondo, Yoshikazu*; Yano, Kimihiko ; Kaji, Naoya; Washiya, Tadahiro 

For the defueling from Fukushima-Daiichi Nuclear Power Plant (1F) Units 1 to 3, estimation of chemical forms of fuel debris in the reactor pressure vessel (RPV) is necessary. Due to lack of actual information of 1F-core damaged status, the chemical forms had been estimated with the help of thermodynamic equilibration. However, after core degradation, material distribution is quite different from that before the accident. This effect should be considered in the chemical form estimation. In this study, chemical forms of in-vessel fuel debris were roughly evaluated based on the result of melt progression analysis (SA analysis). The case of Unit 2 was especially focused on due to its earliest schedule of defueling.

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