Conception d’un système avancé de réacteur PWR flexible par les apports conjoints de l’ingénierie système et de l’automatique

Abstract : In the event of increasing renewable energies in France, this thesis proposes to study the flexibility increase of pressurized water reactors (PWR) throughout two different engineering disciplines aiming at complementary objectives: Systems Engineering (SE) and Control theory.In a first phase, within the frame of complex systems design and Model Based Systems Engineering, this work proposes a SE method based on SE standard principles and compliant with Framatome’s practices and addressing the revealed issues. This SE contribution is twofold: formalize and ensure the path from requirements to system architectures and enhance the capabilities of models verification. The method revolves around interoperable modeling languages, covering the SE processes: from requirement engineering to system architecture design. The method is applied to the system, which performances are the most limiting in the context of flexibility increase: the Core Control. This algorithmic reactor component ensures the control of: the average coolant temperature, the axial offset and the rod bank position, three of the core main functioning parameters.In order to provide a technical contribution relying on some advanced control methodologies. It consists in designing a control system meeting the requirements defined by the SE method application. The proposed solution is in a two-layer control strategy using the synergies of multi-objective control, gain-scheduling and predictive control strategies. A simplified innovative nuclear reactor model is employed to conceive the control algorithm, simulate and verify the developed models. The results obtained from this original approach showed the ability to adapt to various specifications. Compared to conventional core control modes, the simulation results showed very promising performances, while meeting the requirements, when evaluated on a realistic reactor model.
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Theses
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Lori Lemazurier. Conception d’un système avancé de réacteur PWR flexible par les apports conjoints de l’ingénierie système et de l’automatique. Automatique. Ecole nationale supérieure Mines-Télécom Atlantique, 2018. Français. ⟨NNT : 2018IMTA0069⟩. ⟨tel-01815345⟩

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