Hydraulic and statistical study of metastable phenomena in PWR rod bundles - Archive ouverte HAL Access content directly
Journal Articles EPJ N - Nuclear Sciences & Technologies Year : 2020

Hydraulic and statistical study of metastable phenomena in PWR rod bundles

(1)
1

Abstract

The analysis of fuel rod bundle flows constitutes a key element of Pressurized-Water Reactors (PWR) safety studies. The present work aims at improving our understanding of nefarious reorganisation phenomena observed by numerous studies in the flow large-scale structures. 3D simulations allowed identifying two distinct reorganisations consisting in a sign change for either a transverse velocity in rod-to-rod gaps or for a subchannel vortex. A Taylor “frozen turbulence” hypothesis was adopted to model the evolution of large-scale 3D structures as transported-2D. A statistical method was applied to the 2D field to determine its thermodynamically stable states through an optimization problem. Similarities were obtained between the PWR coherent structures and the stable states in a simplified 2D geometry. Further, 2D simulations allowed identifying two possible flow bifurcations, each related to one of the reorganisations observed in 3D simulations, laying the foundations for a physical explanation of this phenomenon.
Fichier principal
Vignette du fichier
epjn190081.pdf (2.93 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

cea-03238515 , version 1 (27-05-2021)

Identifiers

Cite

Florian Muller. Hydraulic and statistical study of metastable phenomena in PWR rod bundles. EPJ N - Nuclear Sciences & Technologies, 2020, 6, pp.6. ⟨10.1051/epjn/2019057⟩. ⟨cea-03238515⟩
27 View
18 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More