Conference paper Open Access

THE NEW NEUTRON NOISE SOLVER OF THE MONTE CARLO CODE TRIPOLI-4

Am´elie Rouchon,Walid Jarrah and Andrea Zoia


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    <subfield code="a">Mathematics &amp; Computational Methods Applied to Nuclear Science &amp; Engineering</subfield>
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    <subfield code="a">THE NEW NEUTRON NOISE SOLVER OF THE MONTE CARLO CODE TRIPOLI-4</subfield>
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    <subfield code="a">Core monitoring techniques and experimental validation and demonstration</subfield>
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    <subfield code="a">&lt;p&gt;Neutron noise appears as fluctuations of the neutron field induced by vibrations of fuel elements,&lt;br&gt;
control rods or any other mechanical structures in the core, as well as from global&lt;br&gt;
or local fluctuations in the flow, density or void fraction of the coolant. Neutron noise&lt;br&gt;
equations are obtained by assuming small perturbations of macroscopic cross-sections&lt;br&gt;
around a steady-state neutron field and by subsequently taking the Fourier transform in&lt;br&gt;
the frequency domain. Recently, a new Monte Carlo algorithm was proposed in order to&lt;br&gt;
solve the transport equation in neutron noise theory with complex-valued weights and a&lt;br&gt;
modified collision operator. This paper presents the new neutron noise solver based on&lt;br&gt;
these methods and implemented in the reference Monte Carlo code TRIPOLI-4R &amp;nbsp;developed&lt;br&gt;
at CEA. We illustrate the capabilities of the solver by considering the noise analysis&lt;br&gt;
of a UOX PWR assembly.&lt;/p&gt;</subfield>
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