Calculation of the Neutron Noise Induced by Shell-Mode Core-Barrel Vibrations in a 1-D, Two-Group, Two-Region Slab Reactor Model

Sunde, Carl; Demazière, Christophe; Pázsit, Imre

doi:10.13182/nt06-1

Cited by 8 publications

(1 citation statement)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Modelling a vibrating fuel assembly in the frequency domain Now, we describe how to model the vibration of an FA as a perturbation of cross sections in the frequency domain, following the derivation originally introduced for modelling the vibrations of control rods (see (Pázsit, 1988)), thereafter the modelling of core barrel vibrations (see e.g. (Sunde et al, 2006)), and more recently, the modelling of vibrating fuel assemblies (see (Jonsson et al, 2012)). This model is often referred to as the " /D model".…”

Section: Principles Of Frequency Domain Simulationsmentioning

confidence: 99%

A time and frequency domain analysis of the effect of vibrating fuel assemblies on the neutron noise

Vidal-Ferràndiz

Carreño

Ginestar

et al. 2020

Annals of Nuclear Energy

View full text Add to dashboard Cite

The mechanical vibrations of fuel assemblies have been shown to give rise to high levels of neutron noise, triggering in some circumstances the necessity to operate nuclear reactors at a reduced power level. This work analyses the effect in the neutron field of the oscillation of one single fuel assembly. Results show two different effects in the neutron field caused by the fuel assembly vibration. First, a global slow variation of the total reactor power due to a change in the criticality of the system. Second, an oscillation in the neutron flux in-phase with the assembly vibration. This second effect has a strong spatial dependence that can be used to localize the oscillating assembly. This paper shows a comparison between a time-domain and a frequency-domain analysis of the phenomena to calculate the spatial response of the neutron noise. Numerical results show a really close agreement between these two approaches.

show abstract

Section: Principles Of Frequency Domain Simulationsmentioning

confidence: 99%