Verification of the code DYN3D for calculations of neutron flux fluctuations
Artikel i vetenskaplig tidskrift, 2022

Insufficiently explained magnitudes and patterns of flux fluctuation observed mainly in KWU PWRs are recently investigated by various European institutions. Among the numerical tools used to investigate the neutron flux fluctuations is the time-domain reactor dynamics code DYN3D. As DYN3D and comparable codes have not been developed with the primary intention to simulate low-amplitude neutron flux fluctuations, their applicability in this field has to be verified.

In order to contribute to the verification of DYN3D for the simulation of neutron flux fluctuations, two special cases of perturbations of the neutron flux (a localized absorber of variable/oscillatory strength and a travelling oscillatory perturbation) are considered with DYN3D on the one hand and with the frequency-domain neutron noise tool CORE SIM as well as analytical frequency-domain approaches, respectively, on the other hand. The obtained results are compared with respect to the distributions of the amplitude and the phase of the induced neutron flux fluctuations. The comparisons are repeated with varied amplitudes and frequencies of the perturbation.

The results agree well both qualitatively and quantitatively for each of the conducted calculations. The remaining deviations between the DYN3D results and the reference results exhibit a dependence on the perturbation magnitude, which is attributed to the neglect of higher-order terms (linear theory) of the perturbed quantities in the calculation of the reference solutions.

Deterministic reactor modelling

CORE SIM

DYN3D

Neutron noise

Författare

M. Viebach

Technische Universität Dresden

C. Lange

Technische Universität Dresden

S. Kliem

Helmholtz-Zentrum Dresden-Rossendorf

Christophe Demaziere

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

U. Rohde

HZDR-Innovation Rossendorf

D. Hennig

Technische Universität Dresden

A. Hurtado

Technische Universität Dresden

Annals of Nuclear Energy

0306-4549 (ISSN)

Vol. 166 108735

Ämneskategorier

Övrig annan teknik

Annan fysik

Styrkeområden

Energi

DOI

10.1016/j.anucene.2021.108735

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Senast uppdaterat

2021-10-18