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Conception neutronique de configurations expérimentales à forte adaptation spectrale en réacteur de puissance nulle pour des applications multi-filières Gen-II,III & IV

Abstract : This PhD thesis focuses on the neutronics design of experimental configurations to improve knowledge on neutronical parameters, in particular nuclear data in enlarged spectrum energy domains, in the future Zero Power Reactor ZEPHYR. Its awaited high spectral flexibility faces a major challenge due to the presence of a peripheral water zone. Answering the needs of current and future electronuclear reactor fleet requires a faithful reproduction of their neutronical characteristics in the measurement zone. Then, the issue is to understand how to design an efficient spectral adaptation between the periphery and the experimental zone, and to apply it on Generations II, III and IV dedicated configurations.As a first step, fast-thermal coupled cores were studied in order to support the development of Generation IV fast reactors. Such configurations had been previously realized, but our work intends to provide a rigorous design approach to insure the neutronical independence of the fast central zone regarding the peripheral thermal zone. An optimized configuration has been defined; some adaptations allow to target either absorption or scattering cross-sections during dedicated sample oscillation campaigns. Preliminary safety studies associated to the safe operation of this optimized configuration have also been realized in order to justify its practical feasibility.A second step used the spectral adaptation principles to target the 10 eV to 10 keV energy domain. Even though this domain is not directly related to a concept of reactor, it suffers from a lack of dedicated experiments despite several applications, in particular for criticality/safety issues.Finally, the sensitivity calculations of reactivity effects to nuclear data measured in the centers of these configurations still remains an unresolved problem to which this PhD thesis brings a contribution thanks to a theoretical modelling.
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https://tel.archives-ouvertes.fr/tel-01689821
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Paul Ros. Conception neutronique de configurations expérimentales à forte adaptation spectrale en réacteur de puissance nulle pour des applications multi-filières Gen-II,III & IV. Micro et nanotechnologies/Microélectronique. Université Grenoble Alpes, 2017. Français. ⟨NNT : 2017GREAI045⟩. ⟨tel-01689821⟩

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