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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<oai_dc:dc xmlns:dc="" xmlns:oai_dc="" xmlns:xsi="" xsi:schemaLocation="">
  <dc:creator>Vidal-Ferràndiz A., Carreño A., Ginestar D., Demazière C., and Verdú G.</dc:creator>
  <dc:description>The mechanical vibrations of fuel assemblies have been shown to give rise to high levels
of neutron noise, triggering in some circumstances the necessity to operate nuclear reactors
at a reduced power level. This work simulates and analyses the effect in the neutron
field of the oscillation of one single fuel assembly without considering thermal-hydraulic
feedback. The amplitude of the fuel assembly vibration ranges from 0 to 1 millimetres
and this implies the use of fine meshes and accurate numerical solvers. Results show
two different effects in the neutron field caused by the fuel assembly vibration. First, a
global slow variation of the total neutron power due to a change in the criticality of the
system. Second, an in-phase change in the neutron flux with the assembly vibration. This
second effect is more important and has a strong spatial dependence. This paper shows
a comparison between a time domain analysis and a frequency domain analysis of the
phenomena, in order to validate the time domain solution against the frequency domain
solution. Numerical results shows a really close match between these two approaches.</dc:description>
  <dc:subject>Neutron noise, fuel assembly vibrations, neutron diffusion, frequency domain, time domain</dc:subject>
  <dc:title>Neutronic simulation of fuel assembly vibrations in a nuclear reactor</dc:title>
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