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Analyses de sensibilité et d'incertitude de données nucléaires.
Contribution à la validation d'une méthodologie utilisant la théorie des perturbations ; application à un concept innovant : réacteur à sels fondus thorium à spectre épithermique

Abstract : Neutronic simulation of nuclear reactors is based on knowledge of the neutron-nucleus interaction (cross-sections, fission neutron yelds and spectra ..) for the dozens of nuclei present in the core over a very large energy range ( fractions of eV to several MeV). To obtain the goal of the sustainable development of nuclear power, future reactors must have new and more strict constraints to their design : optimization of or materials will necessitate breeding (generation of fissile material from fertile), and waste management will require transmutation. Innovative reactors that could achieve such objectives (generation IV or ADS). are loaded with new fuels (thorium, heavy actinides) and function with neutron spectra for which nuclear data do not benefit from 50 years of industrial experience, and thus present particular challenges. After validation on an experimental reactor using an international benchmark, we take classical reactor physics tools along with available nuclear data uncertainties to calculate the sensitivities and uncertainties of the criticality and temperature coefficient of a thorium molten salt reactor. In addition, a study based on the important reaction rates for the calculation of cycle's equilibrium allows us to estimate the efficiency of different reprocessing strategies and the contribution of these reaction rates on the uncertainty on the breeding and then on the uncertainty of the size of the reprocessing plant. Finally, we use this work to propose an improvement of the high priority experimental request list.
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https://tel.archives-ouvertes.fr/tel-00011573
Contributor : Marie-Christine Blanchet <>
Submitted on : Thursday, February 9, 2006 - 2:58:06 PM
Last modification on : Wednesday, October 14, 2020 - 3:56:47 AM
Long-term archiving on: : Saturday, April 3, 2010 - 10:19:08 PM

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Adrien Bidaud. Analyses de sensibilité et d'incertitude de données nucléaires.
Contribution à la validation d'une méthodologie utilisant la théorie des perturbations ; application à un concept innovant : réacteur à sels fondus thorium à spectre épithermique. Physique Nucléaire Théorique [nucl-th]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00011573⟩

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