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Understanding the n...
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Demaziere, Christophe,1973Chalmers tekniska högskola,Chalmers University of Technology
(author)
Understanding the neutron noise induced by fuel assembly vibrations in linear theory
- Article/chapterEnglish2022
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Elsevier BV,2022
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LIBRIS-ID:oai:research.chalmers.se:26a8b105-f26b-4f58-92d6-bce7ad1501ff
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https://research.chalmers.se/publication/530521URI
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https://doi.org/10.1016/j.anucene.2022.109169DOI
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
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This paper investigates the underlying physical mechanisms involved in the monochromatic vibrations of fuel assemblies and their effects on the induced neutron noise throughout the core of nuclear reactors, in the framework of simplified benchmark configurations. Any vibrating fuel pin introduces noise sources at the frequency of vibrations, as well as at higher harmonics, the first one being the most significant of those. Depending on the harmonics considered, the position of the vibrating fuel pin, the size of the core and its macroscopic cross-sections, different noise responses are observed within the reactor core. Through the lens of a decomposition of the neutron noise into its point-kinetics component and its deviation from it, the spectrum of noise responses is explained and related to the spatial distribution of the amplitude and phase of the noise sources at the considered frequencies. At the frequency of vibration, possible out-of-phase behaviour of the induced neutron noise can be partially or totally shadowed by the in-phase point-kinetics component, the only exception being for central vibrations in symmetrical systems. At the frequency of the first higher harmonics, the structure of the induced neutron noise is more involved. Nevertheless, due to the compensation of the individual responses associated to the different components of the noise source at that frequency, point-kinetics has a significant contribution. The results of this work sheds new light on the complex spatial pattern of the neutron noise computed by realistic core simulators in case of vibrations of fuel assemblies.
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Rouchon, AmélieUniversité Paris-Saclay,University Paris-Saclay
(author)
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Zoia, AndreaUniversité Paris-Saclay,University Paris-Saclay
(author)
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Chalmers tekniska högskolaUniversité Paris-Saclay
(creator_code:org_t)
Related titles
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In:Annals of Nuclear Energy: Elsevier BV1750306-45491873-2100
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