Journal article Open Access

Studies of reactor noise response to vibrations of reactor internals and thermal-hydraulic fluctuations in PWRs

V. Verma; D. Chionis; A. Dokhane; H. Ferroukhi

This work is a contribution towards the development of computational methods that allow investigation and prediction of reactor noise response due to in-core perturbations such as vibrations of reactor internals and fluctuations in thermal-hydraulic parameters. Further improvements are made to the modelling approach to allow for vibrations of fuel assemblies at higher vibrational modes. Modelling of such realistic noise sources, and assessment of the induced noise response are presented in this paper. Results show that the simulation of individual noise sources and their combinations affect the neutron noise phenomenology.

The neutron noise induced radially and, in particular, axially, reflects the imposed vibrational patterns associated to the higher modes of the fuel assemblies. The results provide confidence in the application of the developed methodology based on commercial time-domain codes for modelling of realistic noise scenarios and numerical noise analyses of the PWR cores.

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