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Développement d’un outil physique orienté conception pour la simulation des excursions de puissance non protégée dans un RNR-Na

Abstract : Within the framework of the Generation IV Sodium-cooled Fast Reactor R&D French program, a new physico-statistical approach is currently followed by the CEA for accident transient calculations in complement to the reference mechanistic codes. This approach involves a fast-running description of extended accident sequences coupling physical models for the main phenomena to advanced statistical analysis techniques. A large number of simulations may be performed in a reasonable computational time while describing all the possible bifurcations of the accident transient. In this context, this PhD work deals with the development (models and results assessment) of the physical tool dedicated to the primary phase of the Unprotected Transient OverPower accident called OCARINa (Outil de Calcul analytique Rapide pour les Insertions de réactivité dans un RNR-Na). The accident main phenomena, their modelling (thermal and thermomechanical models) and a contribution to the experimental and numerical validation are described. Finally a demonstration of BEPU studies has been done, resulting in the identification and the impact quantification of the more influent uncertain parameters on experimental results.
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https://tel.archives-ouvertes.fr/tel-01907916
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Submitted on : Monday, October 29, 2018 - 4:13:19 PM
Last modification on : Monday, May 18, 2020 - 11:13:05 PM
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  • HAL Id : tel-01907916, version 1

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Kevin Herbreteau. Développement d’un outil physique orienté conception pour la simulation des excursions de puissance non protégée dans un RNR-Na. Génie civil nucléaire. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAI051⟩. ⟨tel-01907916⟩

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