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Prediction of the effects of boron release kinetics on the vapor species of cesium and iodine fission products

核分裂生成物のセシウム及びヨウ素蒸気種に与えるホウ素放出速度の影響予測

三輪 周平; 山下 真一郎; 逢坂 正彦

Miwa, Shuhei; Yamashita, Shinichiro; Osaka, Masahiko

破損燃料からの放出時のセシウム(Cs)及びヨウ素(I)蒸気種を、ホウ素(B)の放出速度の影響に着目して化学平衡計算により予測した。Cs, I及びモリブデン(Mo)の放出速度は、雰囲気依存が評価できるように改良したモデルを用いて評価した。Bの放出速度は、鉄(Fe)とBの化合物形成を考慮して評価した。予測の結果、水蒸気雰囲気では、約2250KからCsBO$$_{2}$$としてBが放出される一方、水蒸気欠乏雰囲気では、Fe-B化合物形成によりBの放出速度が低下し、CsBO$$_{2}$$の生成が抑制されることがわかった。この水蒸気欠乏雰囲気におけるCsBO$$_{2}$$生成の抑制効果により、ガス状のヨウ化水素HI及び高揮発性の金属Iの生成量が低くなることがわかった。

Cesium (Cs) and iodine (I) vapor species formed just after release from degraded fuels were predicted by means of the chemical equilibrium calculation with focuses on the effects of boron (B) release kinetics. Modified equations for the release kinetics of Cs, I and molybdenum (Mo) were utilized for evaluation of atmospheric dependences of their releases fractions. The release kinetics of B was evaluated considering the formation of iron (Fe)-B-O-H compounds. The release of B was enhanced above approximately 2250 K with the vapor species of CsBO$$_{2}$$ under steam atmosphere, while the formation of CsBO$$_{2}$$ was limited under steam-starvation atmosphere due to the much lower the release of B by the formation of low volatile Fe-B compounds. This limitation of CsBO$$_{2}$$ formation would have resulted in a lesser formation of gaseous hydrogen iodine, HI, and a high volatile atomic I under steam-starvation atmosphere.

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パーセンタイル:17.95

分野:Nuclear Science & Technology

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