A multi-group neutron noise simulator for fast reactors

Tran, Hoai-Nam; Zylbersztejn, Florian; Demazière, Christophe; Jammes, C.; Filliatre, P.

doi:10.1016/j.anucene.2013.06.017

Cited by 6 publications

(5 citation statements)

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“…A coarse mesh finite difference (CMFD) method is employed for accelerating the convergence of both the static and the noise solutions, in which a coarse mesh is radially defined as a hexagonal assembly. In previous works, benchmarking calculations for the static state of the ESFR core were performed and had a good agreement with ERANOS [14]. Noise calculations in a two-group model had also a good agreement with analytical solutions [13].…”

Section: Principles Of the Neutron Noise Simulatormentioning

confidence: 70%

“…Therefore, in a 3D model, each fundamental node has five interfaces including two equilateral triangular bases and three rectangular sides. More detailed description about the noise simulator can be seen in [14]. Figure 1 displays the spatial discretization of a hexagonal system in a 60-degree domain.…”

Section: Principles Of the Neutron Noise Simulatormentioning

confidence: 99%

“…Core Model. In the present work, numerical calculations have been performed based on a 2D model of European sodium-cooled fast reactor (ESFR) [16] using the multigroup noise simulator [14]. The core is designed with an output power of 3600 MWt.…”

Section: Calculations Of the Neutron Noise In An Sfrmentioning

confidence: 99%

“…The operation of the core is controlled by 24 control rods and 9 safety rods. The cross section data and the kinetic parameters of a 3D model at the beginning of cycle were taken from previous works which were performed for verifying the tool and for simulating periodic core deformation of the ESFR core [14,15]. The data are then processed for a 2D model in this calculation for the purpose of investigating the properties of the neutron noise on an axial plane.…”

Section: Calculations Of the Neutron Noise In An Sfrmentioning

confidence: 99%

“…This is also one of the difficulties for numerical simulation in predicting or interpreting the measurement phenomena. To simulate the neutron noise in fast reactors with hexagonal fuel assemblies, a neutron noise simulator was developed based on multigroup diffusion theory [13,14]. The tool consists of two modules: a static module for solving the eigenvalue problem of a static state and a noise module for solving the neutron noise equation with a given source in a frequency domain.…”

Section: Introductionmentioning

confidence: 99%

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Properties of Neutron Noise Induced by Localized Perturbations in an SFR

Tran

2015

Science and Technology of Nuclear Installations

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Investigation of the properties of neutron noise induced by localized perturbations in a sodium-cooled fast reactor has been performed using a multigroup neutron noise simulator. Three representations of the noise source associated with the perturbations of absorption, fission, and scattering cross sections, respectively, were assumed to be located at the first fuel ring around the central assembly. The energy- and space-dependent noise, that is, the amplitude and the phase, was calculated in a wide range of frequencies, for example, 0.1–100 Hz. The results show that in the important energy range (>1.0 keV) where the noise amplitude is significant the phase is almost constant with energy at the calculated frequencies despite the source types. At low frequencies, the variation of the phase is negligibly small at a large distance from the source. The perturbation in several fast groups has a significant contribution and dominates the amplitude and the phase of the induced noise.

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Section: Principles Of the Neutron Noise Simulatormentioning

confidence: 70%

Section: Principles Of the Neutron Noise Simulatormentioning

confidence: 99%

Section: Calculations Of the Neutron Noise In An Sfrmentioning

confidence: 99%

Section: Calculations Of the Neutron Noise In An Sfrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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