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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >The effect of temperature and fuel surface area on spent nuclear fuel dissolution kinetics under H-2 atmosphere
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The effect of temperature and fuel surface area on spent nuclear fuel dissolution kinetics under H-2 atmosphere

机译：温度和燃料表面积对H-2气氛下核燃料溶出动力学的影响

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In this work we present the results of two spent nuclear fuel leaching experiments in simulated granitic groundwater, saturated with hydrogen under various pressures. The results show a large impact of the dissolved hydrogen already at 1 bar H-2 and room temperature on the release of both the uranium and of the fission products contained in the fuel matrix. Based on the results of this study and on published data with fuel from the same rod, the importance of the oxidative dissolution of spent fuel under repository conditions as compared to its non-oxidative dissolution is discussed. The XPS-spectra of the fuel surface before the tests and after long-term leaching under hydrogen are reported and compared to reduced UO2 and SIMFUEL surfaces. The overall conclusion is that in spite of the unavoidable air contamination, hydrogen pressures of 1 bar or higher counteract successfully the oxidative dissolution of the spent nuclear fuel. The stability of the 4d-element metallic particles during fuel leaching under such conditions is also discussed, based on data for their dissolution. The metallic particles are also stable under such conditions and are not expected to release their component metals during long-term fuel leaching. (C) 2020 The Authors. Published by Elsevier B.V.
机译：在这项工作中，我们在模拟的花岗岩地下水中呈现了两种废核燃料浸出实验的结果，在各种压力下饱和氢气。结果表明溶解的氢气已经在1巴H-2和室温下对铀和燃料基质中包含的裂变产物的释放进行了大的影响。基于本研究的结果和与来自同一杆的燃料的发布数据，讨论了与其非氧化溶解相比储存的燃料氧化溶解的重要性。报告并在氢气下进行测试和长期浸出后的燃料表面的XPS光谱，并与减少的UO2和SIMFUEL表面进行比较。总体结论是，尽管存在不可避免的空气污染，但1巴的氢气压力成功抵消了废核燃料的氧化溶解。还讨论了在这种条件下燃料浸出过程中的4D元件金属颗粒的稳定性，基于其溶解的数据。金属颗粒在这种条件下也稳定，并且预计不会在长期燃料浸出过程中释放它们的组分金属。 （c）2020作者。由elsevier b.v出版。

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