IMPLEMENTATION OF A DOMINANT MODES SOLVER IN DRAGON
36th Annual CNS Conference - 2016 June 19-22


Presented at:
36th Annual CNS Conference
2016 June 19-22
Location:
Toronto, Canada
Session Title:
Session T3A: Reactor and Radiation Physics

Authors:
S.R. Housseiny Milany (École Polytechnique de Montréal)
G. Marleau (École Polytechnique de Montréal)
  

Abstract

Solution of the k-eigenvalue transport problem has been limited in lattice codes to the fundamental mode corresponding to the largest eigenvalue. Despite the fact that the higher order modes have no physical meaning, they can have significant uses in different applications. While the fundamental mode represents the asymptotic behaviour of the neutron flux, higher modes describe the small perturbations about it; hence, they can be employed in perturbation studies. Another important application of the higher modes is flux synthesis or mapping. Starting with a reference solution of the neutron flux at a coarse level and a number of modes at a finer level, detailed flux distribution can be reconstructed from a coarse solution. In this work, an implementation of a neutron flux modes solver in DRAGON is described. The solver is based on the QZ decomposition algorithm. The approach is described and results are presented.

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