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放射化金属廃棄物の分留特性の数値解析

Numerical analysis of fractional distillation characteristics for radioactive metallic waste

赤岡 克昭 ; 丸山 庸一郎

Akaoka, Katsuaki; Maruyama, Yoichiro

おもにステンレスから構成されるJPDR金属廃棄物を対象に0$$sim$$2500$$^{circ}$$Cまで200$$^{circ}$$C/hで昇温する場合の分留特性の数値解析を行った。解析モデルはHenryの法則をLangmuirの式に適用しRunge-Kutta法を用いて解析した。その結果、$$^{152,154}$$Eu及び$$^{14}$$C, $$^{94}$$Nbは分留によって除去できることが示された。$$^{54}$$Mn及び$$^{55}$$Feについては、30年程度の冷却によって放射能をクリアランスレベル以下に低減できる。したがって、$$^{59,63}$$Niと$$^{60}$$Coをレーザーによって除去することにより、放射化金属の廃棄物量を1/100以下にできる可能性があることが明らかになった。

The fractional distillation characteristics at between 0 $$^{circ}$$C and 2500 $$^{circ}$$C(the rate is 200 $$^{circ}$$C/h) of radioactive metallic waste for JPDR which mainly consists of stainless steel were analyzed numerically. In the simulation, the vaporization rates of the components of JPDR waste were calculated by using the Langmuir's equation and Henry's law. As the results, it was calculated that $$^{152,154}$$Eu, $$^{14}$$C and $$^{94}$$Nb can be removed by the fractional distillation. On the other hand, $$^{54}$$Mn and $$^{55}$$Fe can be reduced by cooling them for about 30 years. Therefore, by removing $$^{59,63}$$Ni and $$^{60}$$Co using laser separation method, it will be possible to reduce the radioactive metallic waste by less than one one-hundredth.

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