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

炭化ホウ素-ステンレス鋼-ジルカロイ混合溶融物中に生成するホウ化鉄及びホウ化ジルコニウムからのB放出に係る化学反応の推定

井元 純平 ; 三輪 周平  ; 逢坂 正彦  

Imoto, Jumpei; Miwa, Shuhei; Osaka, Masahiko

軽水炉シビアアクシデント時にBWR制御ブレード溶融体中に生成されるFe-BおよびZr-B系化合物からのB放出化学反応を熱分析とX線回折分析により実験的に推定した。その結果、Zr-Bでは酸化によって生成したB$$_{2}$$O$$_{3}$$のみを経由してB放出に至っていることが分かった。一方、Fe-B化合物ではB$$_{2}$$O$$_{3}$$に加え、一部は安定なFe-B-O化合物の生成を介してB放出に至っていることが分かった。

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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