Conference paper Open Access

Neutronic simulation of fuel assembly vibrations in a nuclear reactor

Vidal-Ferràndiz A., Carreño A., Ginestar D., Demazière C., and Verdú G.

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  "description": "<p>The mechanical vibrations of fuel assemblies have been shown to give rise to high levels<br>\nof neutron noise, triggering in some circumstances the necessity to operate nuclear reactors<br>\nat a reduced power level. This work simulates and analyses the effect in the neutron<br>\nfield of the oscillation of one single fuel assembly without considering thermal-hydraulic<br>\nfeedback. The amplitude of the fuel assembly vibration ranges from 0 to 1 millimetres<br>\nand this implies the use of fine meshes and accurate numerical solvers. Results show<br>\ntwo different effects in the neutron field caused by the fuel assembly vibration. First, a<br>\nglobal slow variation of the total neutron power due to a change in the criticality of the<br>\nsystem. Second, an in-phase change in the neutron flux with the assembly vibration. This<br>\nsecond effect is more important and has a strong spatial dependence. This paper shows<br>\na comparison between a time domain analysis and a frequency domain analysis of the<br>\nphenomena, in order to validate the time domain solution against the frequency domain<br>\nsolution. Numerical results shows a really close match between these two approaches.</p>", 
  "license": "", 
  "creator": [
      "@type": "Person", 
      "name": "Vidal-Ferr\u00e0ndiz A., Carre\u00f1o A., Ginestar D., Demazi\u00e8re C., and Verd\u00fa G."
  "headline": "Neutronic simulation of fuel assembly vibrations in a nuclear reactor", 
  "image": "", 
  "datePublished": "2019-08-25", 
  "url": "", 
  "@type": "ScholarlyArticle", 
  "keywords": [
    "Neutron noise, fuel assembly vibrations, neutron diffusion, frequency domain, time domain"
  "@context": "", 
  "identifier": "", 
  "@id": "", 
  "workFeatured": {
    "url": "", 
    "alternateName": "M&C 2019", 
    "location": "Portland, Oregon, USA", 
    "@type": "Event", 
    "name": "Mathematics & Computational Methods Applied to Nuclear Science & Engineering"
  "name": "Neutronic simulation of fuel assembly vibrations in a nuclear reactor"
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