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- W2024334170 abstract "Il est possible de mesurer avec précision une isotherme caractéristique d'une pastille d'UO2 irradiée grâce à l'utilisation de moniteurs dispersées. Cette nouvelle technique repose sur l'emploi d'une dispersion de poudre d'alumine et l'examen du rayon eutectique correspondant à l'isotherme de 1915 °C. L'addition de faibles quantités de poudres d'alumine ne modifie pas la conductibilité thermique de l'UO2 en phase solide mais influence fortement la grosseur des grains de l'UO2 et la structure columnaire. Des résultats d'essais de simulation thermique et d'expériences d'irradiation sont décrits. La méthode est brièvement comparée à l'utilisation de filaments fusibles et à la technique de l'examen de la structure d'UO2 pur. L'isotherme eutectique peut être mesurée à 0,1 mm près. A specific isothermal line can be precisely located in a compact of irradiated uranium dioxide, using the method of dispersed monitors. This novel technique depends on the use of alumina powder dispersed in the uranium dioxide and location of the eutectic radius corresponding to the 1915 °C isothermal line. The addition of a small proportion of alumina does not affect the thermal conductivity of solid uranium dioxide but has a pronounced effect on the grain size and on the columnar structure. Results are presented of thermal simulation tests, and of irradiation experiments. The new method is briefly compared with the use of fusible metal wires and with the examination of the grain structure of pure uranium dioxide. The eutectic isotherm can be located to within about 0.1 mm. Mittels dispergierter Marken kann eine charakteristische Isotherme in einer bestrahlten UO2-Probe genau bestimmt werden. Bei diesem neuen Verfahren wird Aluminiumoxid dispergiert und das eutektische Gebiet gesucht, das einer Temperatur von 1915 °C entspricht. Geringe Al2O3-Zusätze verändern die thermische Leitfähigkeit des Urandioxids in festem Zustand nicht, aber beeinflussen die Korngrösse stark, ferner die Struktur der Stengelkristalle. Die Versuchsergebnisse zur thermischen Simulation und Bestrahlung werden angegeben. Das Verfahren wird kurz mit der Methode à schmelzbarer Drähte verglichen sowie mit den Untersuchungen der Struktur von reinem Urandioxid. Die eutektische Temperatur kann innerhalb 0.1 mm grosser Gebiete bestimmt werden." @default.
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- W2024334170 date "1969-09-01" @default.
- W2024334170 modified "2023-09-26" @default.
- W2024334170 title "Determination de la temperature de fonctionnement d'un combustible irradie a l'aide de moniteurs disperses" @default.
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- W2024334170 doi "https://doi.org/10.1016/0022-3115(69)90076-2" @default.
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