Surface analyses of cesium hydroxide chemisorbed onto type 304 stainless steel
Surface analyses of cesium hydroxide chemisorbed onto type 304 stainless steel
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DOI：
10.1016/j.nucengdes.2016.06.023
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发表时间：
2016-08-15
影响因子：
1.7
通讯作者：
Osaka, M.
中科院分区：
文献类型：
--
作者：
Di Lemma, F. G.;Nakajima, K.;Osaka, M.
在轻水反应堆严重事故（SA）期间，化学吸附是主要重要的，因为它可以影响裂变产物在反应堆容器中的滞留。关于这种沉积物的分布、成分和性质的信息可以影响安全分析后的退役做法，例如，可以用于福岛第一核电站的退役。此外，这些信息可以增强SA代码中应用的化学吸附模型的描述，从而改善源项评估。本文将介绍CsOH化学吸附实验到不锈钢样品，作为反应器结构材料的模拟物所获得的结果。样品后分析表明，CsOH将吸附到表面上，优先与Si杂质反应，形成新检测到的化合物CsFeSiO4。从我们的研究结果，可以推断，结构材料中的Si含量可以决定沉积的放射性Cs的量，并可能保留在反应堆容器后SA。(C)2016爱思唯尔B.V.保留所有权利。
Chemisorption is of main importance during a Severe Accident (SA) at a light water reactor, as it can influence fission product retention in the reactor vessel. Information on the distribution, composition and properties of such deposits can influence the decommissioning practice after a SA, and could be applied, for example, for the decommissioning of the Fukushima Daiichi Nuclear Power Plant. Moreover such information can enhance the description of the chemisorption models applied in SA codes, consequently improving the source term assessment. This paper will present the results obtained from CsOH chemisorption experiments onto stainless steel samples, used as simulants of reactor structural materials. The samples post-analyses showed that CsOH will absorb onto the surface, reacting preferentially with Si impurities and forming a newly detected compound, CsFeSiO4. From our results, it can be inferred that Si content in structural materials can determine the amount of radioactive Cs deposited and potentially retained on the reactor vessel after a SA. (C) 2016 Elsevier B.V. All rights reserved.