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Thermochemical consideration for pyrochemical reprocessing of nitride fuels

窒化物燃料の乾式再処理についての熱力学的考察

林 博和 ; 小川 徹; 湊 和生 

Hayashi, Hirokazu; Ogawa, Toru; Minato, Kazuo

原研では窒化物燃料の再処理に溶融塩を用いた高温化学法である乾式再処理法を適用することを提唱している。このプロセスを検討するためにU-N-Cl系などの電位-窒素分圧図を既存の熱力学データを用いて作成した。溶融塩中でのアノード溶解や酸化剤を用いた溶解といった実験データは、ここで作成した電位-窒素分圧図によって説明されることを示した。

The Japan Atomic Energy Research Institute (JAERI) has proposed the concept of the double-strata fuel cycle, which includes transmutation cycle for burning long-lived minor actinides (MA: Np, Am and Cm) besides the current Japanese commercial fuel cycle. A combination of the nitride fuel and pyrochemical reprocessing has been chosen as a candidate for the fuel cycle of the MA burner systems. The behavior of uranium in pyrochemical reprocessing of nitride fuels were discussed using the stability diagrams (potential-log(p(N$$_2$$)) diagrams). The diagrams of U-N-Cl system were constructed with the thermochemical data of uranium compounds including UNCl. Experimental data for dissolution of uranium nitride with oxidizing agents in LiCl-KCl eutectic melt were compared with the diagrams.

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