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>",
"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",
"datePublished": "2019-08-25",
"url": "https://zenodo.org/record/3567598",
"@type": "ScholarlyArticle",
"keywords": [
"Neutron noise, fuel assembly vibrations, neutron diffusion, frequency domain, time domain"
],
"@context": "https://schema.org/",
"identifier": "https://doi.org/10.5281/zenodo.3567598",
"@id": "https://doi.org/10.5281/zenodo.3567598",
"workFeatured": {
"url": "https://www.mc2019.org/",
"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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