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An Investigation into dissolution rate of spent nuclear fuel in aqueous reprocessing

湿式再処理における使用済燃料溶解速度に関する一考察

峯尾 英章 ; 磯貝 光; 森田 泰治 ; 内山 軍蔵* 

Mineo, Hideaki; Isogai, Hikaru; Morita, Yasuji; Uchiyama, Gunzo*

軽水炉燃料の照射時に熱収縮で生じるクラックを考慮した溶解面積変化を取り込んだ単純な溶解速度式を提案した。提案した式の適用性を既往の研究で得られた使用済燃料溶解試験結果だけでなく、本研究で行った軽水炉使用済燃料の溶解試験結果を用いて検討した。ペレット形状の使用済燃料や粉体状の使用済燃料をもちいた溶解試験で得られたウラン濃度だけでなく硝酸濃度の変化についても、提案した式は良い近似を与えることが示された。これにより、提案した式は単純で軽水炉使用済燃料の溶解速度の予測に役立つことが示唆された。しかしながら、式で用いている初期有効溶解面積について、本提案式では説明できない温度依存性が示されたことから、亜硝酸等、溶解速度に影響を与える他の因子についてさらに検討が必要と考えられた。

A simple equation was proposed for the dissolution rate of spent LWR fuel, of which the change in the dissolution area was estimated by taking into account of the area of the cracks occurring due to thermal shrinkage of the pellets during irradiation. The applicability of proposed equation was examined using LWR fuel dissolution test results in the present study as well as the results obtained by other workers. The equation showed good agreements with the dissolution test results obtained from spent fuel pellets and pulverized spent fuel. It was indicated that the proposed equation was simple and would be useful for the prediction of dissolution of spent LWR fuels. However, the initial effective dissolution area, the parameter of the equation, was found to depend on the temperature, which could not be explained by the proposed equation. Further studies on the role of other factors affecting dissolution rate, such as nitrous acid, in the dissolution of spent fuel was required.

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パーセンタイル:36.97

分野:Nuclear Science & Technology

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