Understanding the neutron noise induced by fuel assembly vibrations in linear theory
Paper i proceeding, 2021

This paper investigates the effects of stationary vibrations of fuel assemblies in nuclear reactors. The incentive of this work is to understand the spatial pattern of the induced stationary fluctuations of the neutron flux. For that purpose, an as simple as possible system was considered: a one-dimensional three-region system, for which the boundaries between the regions are vibrating. Using one-group diffusion theory, it is demonstrated that in the frequency domain and in linear theory the amplitude and phase of the fluctuations in neutron flux exhibit different patterns, stemming from competing contributions between the point-kinetic and the space-dependent responses associated to each moving boundary. The results of this work can be used for interpreting the results of more sophisticated tools used for modellingbly vibrations onto the neutron flux, as well as measurements in reactors where vibrations of fuel assemblies occur.

fuel assembly vibrations

diffusion theory

linear theory

neutron noise

Författare

Christophe Demaziere

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

A. Rouchon

Université Paris-Saclay

A. Zoia

Université Paris-Saclay

Proc. Int. Conf. Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C2021)

Int. Conf. Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C2021)
Online, USA,

Core monitoring techniques and experimental validation and demonstration (CORTEX)

Europeiska kommissionen (EU) (754316CORTEX), 2017-09-01 -- 2021-08-31.

Styrkeområden

Energi

Ämneskategorier

Annan fysik

DOI

10.13182/M&C21-33619

Mer information

Senast uppdaterat

2021-10-19