Dissolution of high burn-up spent nuclear fuel at high-pH

IF 1.4 3区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR
Luis Iglesias, Jakub Kokinda, Daniel Serrano-Purroy, Albert Martínez-Torrents, Ignasi Casas, Joan de Pablo, Frederic Clarens, Javier Giménez
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Abstract

Abstract The release of radionuclides from high-burnup spent nuclear fuel (SNF) segments was studied at pH = 13.2 as well as the effect of the presence of calcium and silicon. The aim was to ascertain the dissolution of SNF in solutions corresponding to a high-level nuclear waste repository including concrete in different structural parts. The release of uranium at pH = 13.2 was higher than at pH = 8.4 in bicarbonate medium, while the presence of calcium resulted in a decrease of the uranium concentrations in solutions, assumed to be the consequence of the formation of a secondary solid phase such as Ca 2 U 2 O 7 . Caesium release was found higher at pH = 13.2 as well, but it was not influenced by the presence of Ca and Si at long term. On the other hand, actinide elements (plutonium, neptunium and americium) dissolution decreased at pH = 13.2, probably because of the formation of secondary solid phases. On the contrary, ruthenium and technetium release at pH = 13.2 was found to be much higher than the measured at lower pH, perhaps due to the higher dissolution kinetics of the metallic inclusions at such pH.
高ph值下高燃乏核燃料的溶解
研究了高燃耗乏核燃料段在pH = 13.2条件下放射性核素的释放,以及钙和硅的存在对放射性核素释放的影响。目的是确定SNF在对应于高放核废料储存库的溶液中的溶解情况,包括不同结构部分的混凝土。在碳酸氢盐介质中,pH = 13.2时铀的释放量高于pH = 8.4时,而钙的存在导致溶液中铀浓度降低,这被认为是形成二次固相(如ca2u2o7)的结果。在pH = 13.2时铯的释放量也较高,但长期不受Ca和Si存在的影响。另一方面,锕系元素(钚、镎和镅)的溶解在pH = 13.2时减少,可能是由于二次固相的形成。相反,发现在pH = 13.2时钌和锝的释放量远高于在较低pH时的测量值,这可能是由于在该pH下金属夹杂物的溶解动力学较高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Radiochimica Acta
Radiochimica Acta 化学-核科学技术
CiteScore
2.90
自引率
16.70%
发文量
78
审稿时长
6 months
期刊介绍: Radiochimica Acta publishes manuscripts encompassing chemical aspects of nuclear science and technology.
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