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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        <foaf:name>Vidal-Ferràndiz A., Carreño A., Ginestar D., Demazière C., and Verdú G.</foaf:name>
        <foaf:givenName>Carreño A., Ginestar D., Demazière C., and Verdú G.</foaf:givenName>
        <foaf:familyName>Vidal-Ferràndiz A.</foaf:familyName>
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    <dct:title>Neutronic simulation of fuel assembly vibrations in a nuclear reactor</dct:title>
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    <dcat:keyword>Neutron noise, fuel assembly vibrations, neutron diffusion, frequency domain, time domain</dcat:keyword>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2019-08-25</dct:issued>
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    <dct:description>&lt;p&gt;The mechanical vibrations of fuel assemblies have been shown to give rise to high levels&lt;br&gt; of neutron noise, triggering in some circumstances the necessity to operate nuclear reactors&lt;br&gt; at a reduced power level. This work simulates and analyses the effect in the neutron&lt;br&gt; field of the oscillation of one single fuel assembly without considering thermal-hydraulic&lt;br&gt; feedback. The amplitude of the fuel assembly vibration ranges from 0 to 1 millimetres&lt;br&gt; and this implies the use of fine meshes and accurate numerical solvers. Results show&lt;br&gt; two different effects in the neutron field caused by the fuel assembly vibration. First, a&lt;br&gt; global slow variation of the total neutron power due to a change in the criticality of the&lt;br&gt; system. Second, an in-phase change in the neutron flux with the assembly vibration. This&lt;br&gt; second effect is more important and has a strong spatial dependence. This paper shows&lt;br&gt; a comparison between a time domain analysis and a frequency domain analysis of the&lt;br&gt; phenomena, in order to validate the time domain solution against the frequency domain&lt;br&gt; solution. Numerical results shows a really close match between these two approaches.&lt;/p&gt;</dct:description>
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    <dct:title>Core monitoring techniques and experimental validation and demonstration</dct:title>
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