Journal article Open Access

# Analysis of the neutron noise induced by fuel assembly vibrations

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

### Citation Style Language JSON Export

{
"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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