Studies on the convergence of a Monte Carlo criticality calculation : coupling with a deterministic code and automated transient detection
type: Dataset
description: Monte Carlo criticality calculation allows to estimate the effective mu- tiplication factor as well as local quantities such as local reaction rates. Some configurations presenting weak neutronic coupling (high burn up pro- file, complete reactor core, ...) may induce biased estimations for kef f or reaction rates. In order to improve robustness of the iterative Monte Carlo méthods, a coupling with a deterministic code was studied. An adjoint flux is obtained by a deterministic calculation and then used in the Monte Carlo. The initial guess is then automated, the sampling of fission sites is modi- fied and the random walk of neutrons is modified using splitting and russian roulette strategies. An automated convergence detection method has been developped. It locates and suppresses the transient due to the initialization in an output series, applied here to kef f and Shannon entropy. It relies on modeling stationary series by an order 1 auto regressive process and applying statistical tests based on a Student Bridge statistics. This method can easily be extended to every output of an iterative Monte Carlo. Methods developed in this thesis are tested on different test cases.
landing page: https://theses.hal.science/tel-00846504
identifier: NNT: 2012GRENY063
keyword: code-deterministe
keyword: code-monte-carlo
keyword: criticality
keyword: criticite
keyword: deterministic-code
keyword: infoeu-reposemanticsdoctoralthesis
keyword: monte-carlo-code
keyword: physics-of-reactor
keyword: physique-des-reacteurs
keyword: physnexpphysics-physicsnuclear-experiment-nucl-ex
keyword: theses
issued: 2026-05-10T07:01:29.953445
modified: 2026-05-10T07:01:29.953449
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Studies on the convergence of a Monte Carlo criticality calculation : coupling with a deterministic code and automated transient detection
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00846504
issued: 2026-05-10T07:01:29.955775
modified: 2026-05-10T07:01:29.938309