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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", 
    "description": "<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>", 
    "language": "eng", 
    "title": "Analysis of the neutron noise induced by fuel assembly vibrations", 
    "license": {
      "id": "CC-BY-4.0"
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    "journal": {
      "volume": "154", 
      "issue": "108061", 
      "title": "Annals of Nuclear Energy"
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    "keywords": [
      "Neutron noise", 
      "Frequency domain", 
      "Linearized equations", 
      "Non-pertubative approach", 
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    "publication_date": "2021-02-17", 
    "creators": [
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        "affiliation": "Universit\u00e9 Paris-Saclay, CEA", 
        "name": "Andrea Zoia"
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      {
        "affiliation": "Universit\u00e9 Paris-Saclay, CEA", 
        "name": "Am\u00e9lie Rouchon"
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      {
        "affiliation": "Universit\u00e9 Paris-Saclay, CEA", 
        "name": "Baptiste Gasse"
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      {
        "affiliation": "Chalmers University of Technology", 
        "name": "Christophe Demazi\u00e8re"
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      {
        "affiliation": "Chalmers University of Technology", 
        "name": "Paolo Vinai"
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