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dc.contributor.authorBOTTOMLEY Paulen_GB
dc.contributor.authorWISS Thierryen_GB
dc.contributor.authorJANSSEN ARNEen_GB
dc.contributor.authorCREMER Berten_GB
dc.contributor.authorTHIELE Hartmuten_GB
dc.contributor.authorMANARA Darioen_GB
dc.contributor.authorSCHEINDLIN M.en_GB
dc.contributor.authorMURRAY FARTHING Maireaden_GB
dc.contributor.authorLAJARGE Patricken_GB
dc.contributor.authorMENNA Marianoen_GB
dc.contributor.authorBOUEXIERE Danielen_GB
dc.contributor.authorRONDINELLA Vincenzoen_GB
dc.identifier.citationMATERIALS SCIENCE AND ENGINEERING vol. 32 p. 1-16en_GB
dc.description.abstractThe ternary oxide ceramic system UO2-ZrO2-FeO is a refractory system that is of great relevance to the nuclear industry as it represents one of the main systems resulting from the interaction of the Zircaloy cladding, the UO2 fuel and the structural elements of a nuclear reactor. It is particularly the high temperature properties that require investigation; that is, when substantial overheating of the nuclear core occurs and interactions can lead to its degradation, melting and result in a severe nuclear accident. There has been much work on the UO2-ZrO2 system and also on the ternary system with FeO but there is still a need to examine 2 further aspects; firstly the effect of sub-oxidized systems, the UO2-Zr and FeO-Zr systems, and secondly the effect of Fe/Zr or Fe/U ratios on the melting point of the U-Zr-Fe oxide system. Samples of UO2-Zr and UO2-ZrO2-FeO were fabricated at ITU and then characterized by optical microscopy (OM) and X-ray diffraction to determine the ceramic's structure and verify the composition. Thereafter the samples are to be melted by laser flash heating and their liquidus and solidus temperatures determined by pyrometry. This programme is currently ongoing. The frozen samples, after testing, were then sectioned, polished and the molten zone micro-analytically examined by OM & SEM-EDS in order to determine its structure and composition and to compare with the existing phase diagrams. Examples of results from these systems will be given. Finally, a reacted Zr-FeO thermite mixture was examined, which had been used to generate high temperatures during tests of reactor melt-concrete interactions. The aim was to assess the reaction and estimate the heat generation from this novel technique. These results allow verification or improvement of the phase diagram and are of primary importance as input to models used to predict materials interactions in a severe nuclear accident.en_GB
dc.description.sponsorshipJRC.E.2-Hot cellsen_GB
dc.publisherELSEVIER BVen_GB
dc.titleCharacterisation of high temperature refractory ceramics for nuclear applicationsen_GB
dc.typeArticles in periodicals and booksen_GB
JRC Directorate:Nuclear Safety and Security

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