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Développement d'outils académiques pour la conception et la sûreté de réacteurs innovants : premières applications au dimensionnement de SMR refroidis à l'eau légère et chargés en thorium

Abstract : The Generation IV of nuclear reactors aims at making the nuclear energy a sustainable power source, able to contribute efficiently to the energetic transition. To anticipate the delay of this Gen. IV, innovative retro-fitted nuclear reactors with high level of conversion are studied. The conception of such reactors needs the development of a flexible and robust academical tool box in order to:-Evaluate fuel performance. This is done by means of SMURE (Serpent/MCNP Utility for Reactor Evolution), the dedicated CNRS C++ framework, which is adapted to perform burnup calculation both at assembly scale and at core scale.-Evaluate safety performance. This implies coupled transient simulation between neutronics and thermohydraulics. Neutronics is handled by the Nodal Drift Method (NDM) which solves the diffusion equations while thermohydraulics is simplified and computed by the code Basic Approach to ThermalHydraulics (BATH). This coupling between NDM/BATH has been validated on a Rod Ejection Accident (REA) benchmark.Ours tools and methods are applied on the design of sub-moderated water-cooled SMR cores using either Th/U or Th/Pu fuel. In addition to basic conception criteria such as the form factor, the reactivity management has been investigated in details, which has led to the development of a new methodology for optimal used of burnable poisons. The safety analysis against REA highlights new conceptions limits, in particular on the maximal sub-moderating ratio in order to avoid nucleate boiling. It also reveals the consequences on the reactor safety of some design choices such as low soluble boron inventory.
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https://tel.archives-ouvertes.fr/tel-02017647
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Submitted on : Wednesday, February 13, 2019 - 11:53:10 AM
Last modification on : Friday, October 23, 2020 - 5:02:29 PM

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PREVOT_2018_diffusion.pdf
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  • HAL Id : tel-02017647, version 1

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STAR | CNRS | IN2P3 | LPSC | UGA

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Pierre Prévot. Développement d'outils académiques pour la conception et la sûreté de réacteurs innovants : premières applications au dimensionnement de SMR refroidis à l'eau légère et chargés en thorium. Physique Nucléaire Expérimentale [nucl-ex]. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAY041⟩. ⟨tel-02017647⟩

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