Conception et développement d'un mailleur énergétique adaptatif pour la génération des bibliothèques multigroupes des codes de transport

Pietro Mosca 1
1 LLPR - Laboratoire de Logiciels pour la Physique des Réacteurs
SERMA - Service des Réacteurs et de Mathématiques Appliquées : DEN/DM2S/SERMA
Abstract : The deterministic transport codes solve the stationary Boltzmann equation in a discretized energy formalism called multigroup. The trans- formation of continuous data in a multigroup form is obtained by avera- ging the highly variable cross sections of the resonant isotopes with the solution of the self-shielding models and the remaining ones with the co- arse energy spectrum of the reactor type. So far the error of such an ap- proach could only be evaluated retrospectively. To remedy this, we stu- died in this thesis a set of methods to control a priori the accuracy and the cost of the multigroup transport computation. The energy mesh optimisation is achieved using a two step process : the creation of a reference mesh and its optimized condensation. In the first stage, by refining locally and globally the energy mesh, we seek, on a fine energy mesh with subgroup self-shielding, a solution equivalent to a reference solver (Monte Carlo or pointwise deterministic solver). In the second step, once fixed the number of groups, depending on the accep- table computational cost, and chosen the most appropriate self-shielding models to the reactor type, we look for the best bounds of the reference mesh minimizing reaction rate errors by the particle swarm optimization algorithm. This new approach allowed to define new meshes for fast reactors as accurate as the currently used ones, but with fewer groups.
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Submitted on : Tuesday, March 13, 2012 - 2:31:04 PM
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Pietro Mosca. Conception et développement d'un mailleur énergétique adaptatif pour la génération des bibliothèques multigroupes des codes de transport. Physique mathématique [math-ph]. Université Paris Sud - Paris XI, 2009. Français. ⟨tel-00678561⟩

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