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Report No.

Estimation of chemical reaction for boron release from iron borides and zirconium boride formed in mixed melts of boron carbide-stainless steel-zircaloy

Imoto, Jumpei ; Miwa, Shuhei  ; Osaka, Masahiko  

The chemical reactions for release of B from Fe-B and Zr-B compounds formed in the BWR control blade melts at severe accident in light water reactor were experimentally estimated by thermal analysis and X-ray diffraction analysis. For the Zr-B compounds, it was found that B was released via only B$$_{2}$$O$$_{3}$$ formed by oxidation. On the other hand, for the Fe-B compounds, it was found that B were released via two kinds of B oxides, B$$_{2}$$O$$_{3}$$ and stable Fe-B-O compounds.



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