Operational modal analysis of flow-induced vibration of nuclear fuel rods in a turbulent axial flow

Research output: Contribution to journalArticle

Authors

Institutes & Expert groups

Documents & links

Abstract

Flow-induced vibration of nuclear reactor fuel pins can result in mechanical noise and lead to failure of the reactor's fuel assembly. This problem can be exacerbated in the new generation of liquid heavy metal fast reactors that use a much denser and more viscous coolant in the reactor core. An investigation of the flow-induced vibration in these particular conditions is therefore essential. In this paper, we describe an analysis technique to evaluate flow-induced vibration of nuclear reactor fuel pins subjected to a turbulent axial flow of heavy metal. We deal with a single fuel pin mockup designed for the lead–bismuth eutectic (LBE) cooled MYRRHA reactor which is subjected to similar flow conditions as in the reactor core. Our analysis is based on operational modal analysis (OMA) techniques. We show that the accuracy and precision of our OMA technique is higher compared to traditional methods and that it allows evaluating the evolution of modal parameters in operational conditions. We also demonstrate the possible onset of a fluid-elastic instability by tracking the modal parameters with increasing flow velocity.

Details

Original languageEnglish
Pages (from-to)19-26
JournalNuclear Engineering and Design
Volume284
DOIs
Publication statusPublished - 1 Apr 2015

Keywords

  • flow-induced vibration, modal analysis, nuclear fuel

ID: 1003503