Journal article Open Access

Analysis of the neutron noise induced by fuel assembly vibrations

Andrea Zoia; Amélie Rouchon; Baptiste Gasse; Christophe Demazière; Paolo Vinai


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{
  "DOI": "10.1016/j.anucene.2020.108061", 
  "container_title": "Annals of Nuclear Energy", 
  "language": "eng", 
  "title": "Analysis of the neutron noise induced by fuel assembly vibrations", 
  "issued": {
    "date-parts": [
      [
        2021, 
        2, 
        17
      ]
    ]
  }, 
  "abstract": "<p>The investigation of neutron noise is key to several applications in nuclear reactor<br>\nphysics, such as the detection of control rod or assembly vibrations and<br>\nthe diagnostic of coolant speed and void fraction. In this paper we will elucidate<br>\nsome aspects of the noise equations in the Fourier domain, for the case of<br>\nperiodic fuel rod vibrations with frequency &omega;<sub>0</sub> in a small symmetrical system<br>\nin which the perturbation is centrally located. We will in particular focus on<br>\nthe double frequency effect, i.e., the emergence of a noise component at 2&omega;<sub>0</sub><br>\n(possibly stronger than the one at the fundamental frequency &omega;<sub>0</sub>). Our analysis<br>\nwill be carried out without truncating the noise source at the first order and in<br>\nthe context of a non-perturbative approach (i.e., without resorting to linearization).<br>\nFor this purpose, we will select a simple benchmark configuration that<br>\nis amenable to accurate reference solutions obtained by solving the exact timedependent<br>\ntransport equations. The analysis carried out in this work suggests<br>\nthat the non-perturbative noise equations are mandatory in order to properly discriminate<br>\nthe possible emergence of double frequency effects in neutron noise,<br>\nespecially in view of comparing simulation results to experimental data</p>", 
  "author": [
    {
      "family": "Andrea Zoia"
    }, 
    {
      "family": "Am\u00e9lie Rouchon"
    }, 
    {
      "family": "Baptiste Gasse"
    }, 
    {
      "family": "Christophe Demazi\u00e8re"
    }, 
    {
      "family": "Paolo Vinai"
    }
  ], 
  "volume": "154", 
  "type": "article-journal", 
  "issue": "108061", 
  "id": "4545311"
}
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