Material characterization of the VULCANO corium concrete interaction test with concrete representative of Fukushima Daiichi Nuclear Plants
Material characterization of the VULCANO corium concrete interaction test with concrete representative of Fukushima Daiichi Nuclear Plants
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VULCANO 真皮混凝土与福岛第一核电站代表混凝土相互作用测试的材料特性
DOI：
10.1016/j.jnucmat.2019.151860
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发表时间：
2020
影响因子：
3.1
通讯作者：
T. Washiya
中科院分区：
文献类型：
--
作者：
L. Brissonneau;H. Ikeuchi;P. Piluso;Josselin Gousseau;C. David;V. Testud;J. Roger;V. Bouyer;T. Kitagaki;A. Nakayoshi;S. Dubois;T. Washiya
在日本原子能机构-欧洲环境局合作的框架内，开展了实验研究，以估计福岛第一核电站受损堆芯熔化物碎片的材料特性。在CEA Cadarache的VULCANO设施中进行了一项试验，以模拟混凝土堆芯反应堆与原型堆芯反应堆（使用贫化铀）和福岛第一核电站1F 1混凝土的相互作用（CCI）。本文介绍了9个样品的CCI代表在这次测试中的测试后分析：在堆芯熔化池，在结壳和在垂直和水平界面与混凝土。通过SEM/EDS、X射线衍射、完全溶解和ICP、主要相的显微硬度测量进行了分析。该池是非常多孔的，其组成是均匀的，但在界面处观察到金属块。遇到的主要相是富铀和富锆的氧化物，形成从微米到毫米大小的结核，几微米的富铬铁沉淀物，金属Fe-Ni液滴和基质中的富铬硅细丝，可能是玻璃状的，富含具体元素：Si，Al，Ca，但含有多达12个阳离子。基体是较软的氧化物相，而富Cr沉淀物较硬。分析是一致的估计宏观烧蚀率，但仍然不能解释这个特定的玄武岩混凝土观察到的重要轴向烧蚀。讨论了不同相的形成、分布及凝固路径。第一个比较建议与欧洲混凝土的前CCI测试。这些结果提供了有益的见解，为未来的拆除工厂和更深入地了解玄武岩混凝土的CCI过程。
In the framework of JAEA-CEA collaboration, experimental studies have been conducted for estimating the material characteristics of corium debris representative of the Fukushima Daiichi nuclear damaged plants. A test has been performed in the VULCANO facility in CEA Cadarache to simulate the concrete corium interaction (CCI) with prototypic corium (using depleted uranium) and concrete of Fukushima Daiichi 1F1 Nuclear Plants. This paper presents the Post Test Analyses on 9 samples representative of the CCI during this test: in the corium pool, in the crusts and at the vertical and horizontal interfaces with the concrete. Analyses have been performed by SEM/EDS, X-Ray Diffraction, complete dissolution and ICP, micro-hardness measurements of the main phases. The pool is very porous, its composition is homogeneous but metallic blocks have been observed at the interfaces. The major phases encountered are uranium rich and zirconium rich oxides forming nodules from micrometers to millimeters size, chromium-iron rich precipitates of several micrometers, metallic Fe–Ni droplets and chromium-silicon rich filaments in a matrix, likely vitreous, rich in concrete elements: Si, Al, Ca, but containing up to 12 cations. The matrix is the softer oxide phase, when the Cr rich precipitates are the harder. The analyses are consistent with the estimated macroscopic ablation ratio, but do not still explain the important axial ablation observed for this specific basaltic concrete. The different phases formation, distribution and solidification path are discussed. First comparisons are proposed with the former CCI tests with European concretes. These results give helpful insights for the future dismantling of the plant and for a deeper understanding of the CCI process for basaltic concrete.