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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  <identifier identifierType="URL">https://zenodo.org/record/4545311</identifier>
  <creators>
    <creator>
      <creatorName>Andrea Zoia</creatorName>
      <affiliation>Université Paris-Saclay, CEA</affiliation>
    </creator>
    <creator>
      <creatorName>Amélie Rouchon</creatorName>
      <affiliation>Université Paris-Saclay, CEA</affiliation>
    </creator>
    <creator>
      <creatorName>Baptiste Gasse</creatorName>
      <affiliation>Université Paris-Saclay, CEA</affiliation>
    </creator>
    <creator>
      <creatorName>Christophe Demazière</creatorName>
      <affiliation>Chalmers University of Technology</affiliation>
    </creator>
    <creator>
      <creatorName>Paolo Vinai</creatorName>
      <affiliation>Chalmers University of Technology</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Analysis of the neutron noise induced by fuel assembly vibrations</title>
  </titles>
  <publisher>Zenodo</publisher>
  <publicationYear>2021</publicationYear>
  <subjects>
    <subject>Neutron noise</subject>
    <subject>Frequency domain</subject>
    <subject>Linearized equations</subject>
    <subject>Non-pertubative approach</subject>
    <subject>Harmonics</subject>
  </subjects>
  <dates>
    <date dateType="Issued">2021-02-17</date>
  </dates>
  <language>en</language>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/4545311</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1016/j.anucene.2020.108061</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="https://creativecommons.org/licenses/by/4.0/legalcode">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;The investigation of neutron noise is key to several applications in nuclear reactor&lt;br&gt;
physics, such as the detection of control rod or assembly vibrations and&lt;br&gt;
the diagnostic of coolant speed and void fraction. In this paper we will elucidate&lt;br&gt;
some aspects of the noise equations in the Fourier domain, for the case of&lt;br&gt;
periodic fuel rod vibrations with frequency &amp;omega;&lt;sub&gt;0&lt;/sub&gt; in a small symmetrical system&lt;br&gt;
in which the perturbation is centrally located. We will in particular focus on&lt;br&gt;
the double frequency effect, i.e., the emergence of a noise component at 2&amp;omega;&lt;sub&gt;0&lt;/sub&gt;&lt;br&gt;
(possibly stronger than the one at the fundamental frequency &amp;omega;&lt;sub&gt;0&lt;/sub&gt;). Our analysis&lt;br&gt;
will be carried out without truncating the noise source at the first order and in&lt;br&gt;
the context of a non-perturbative approach (i.e., without resorting to linearization).&lt;br&gt;
For this purpose, we will select a simple benchmark configuration that&lt;br&gt;
is amenable to accurate reference solutions obtained by solving the exact timedependent&lt;br&gt;
transport equations. The analysis carried out in this work suggests&lt;br&gt;
that the non-perturbative noise equations are mandatory in order to properly discriminate&lt;br&gt;
the possible emergence of double frequency effects in neutron noise,&lt;br&gt;
especially in view of comparing simulation results to experimental data&lt;/p&gt;</description>
  </descriptions>
  <fundingReferences>
    <fundingReference>
      <funderName>European Commission</funderName>
      <funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/501100000780</funderIdentifier>
      <awardNumber awardURI="info:eu-repo/grantAgreement/EC/H2020/754316/">754316</awardNumber>
      <awardTitle>Core monitoring techniques and experimental validation and demonstration</awardTitle>
    </fundingReference>
  </fundingReferences>
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