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Cs(Mo,Te)O固溶体的研究及其对快中子反应堆中联合氧化物-增益系统的影响。

Investigation of the Cs(Mo,Te)O Solid Solution and Implications on the Joint Oxyde-Gaine System in Fast Neutron Reactors.

作者信息

Epifano Enrica, Volfi Andrea, Abbink Maas, Nieuwland Hendrik, van Eijck Lambert, Wallez Gilles, Banerjee Dipanjan, Martin Philippe M, Smith Anna L

机构信息

Delft University of Technology, Faculty of Applied Sciences, Radiation Science and Technology Department, Mekelweg 15, 2629 JB Delft, The Netherlands.

Politecnico di Milano, Department of Energy, Nuclear Engineering Division, Via La Masa 34, 20156 Milano, Italy.

出版信息

Inorg Chem. 2020 Jul 20;59(14):10172-10184. doi: 10.1021/acs.inorgchem.0c01307. Epub 2020 Jun 25.

DOI:10.1021/acs.inorgchem.0c01307
PMID:32585097
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7374758/
Abstract

The formation of a thin layer, the so-called Joint Oxyde-Gaine (JOG), between the (U,Pu)O fuel pellets and the cladding has been observed in fast neutron reactors, due to the accumulation of volatile fission products. CsMoO is known to be one of the major components of the JOG, but other elements are also present, in particular tellurium and palladium. In this work, an investigation of the structural and thermodynamic properties of CsTeO and CsMoTeO solid solution is reported. The existence of a complete solubility between CsMoO and CsTeO is demonstrated, combining X-ray diffraction (XRD), neutron diffraction (ND), and X-ray absorption spectroscopy (XAS) results. High-temperature XRD measurements were moreover performed on CsTeO, which revealed the existence of a α-β phase transition around 712 K. Thermal expansion coefficients were also obtained from these data. Finally, phase equilibra points in the CsMoO-CsTeO pseudobinary phase diagram were collected using differential scanning calorimetry and used to develop a thermodynamic model for this system using a regular solution formalism.

摘要

在快中子反应堆中，由于挥发性裂变产物的积累，在（U，Pu）O燃料芯块和包壳之间观察到形成了一层薄的所谓联合氧化物-包层（JOG）。已知CsMoO是JOG的主要成分之一，但也存在其他元素，特别是碲和钯。在这项工作中，报告了对CsTeO和CsMoTeO固溶体的结构和热力学性质的研究。结合X射线衍射（XRD）、中子衍射（ND）和X射线吸收光谱（XAS）结果，证明了CsMoO和CsTeO之间存在完全互溶性。此外，对CsTeO进行了高温XRD测量，结果表明在712 K左右存在α-β相变。还从这些数据中获得了热膨胀系数。最后，使用差示扫描量热法收集了CsMoO-CsTeO伪二元相图中的相平衡点，并使用正规溶液形式主义为该系统开发了一个热力学模型。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dace/7374758/91e95987a250/ic0c01307_0002.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dace/7374758/67253436741c/ic0c01307_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dace/7374758/1ba843876c8b/ic0c01307_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dace/7374758/4b1ad17860f8/ic0c01307_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dace/7374758/d14d8e487bdc/ic0c01307_0008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dace/7374758/b6553fb51dac/ic0c01307_0009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dace/7374758/848134c13cd0/ic0c01307_0014.jpg

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