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Development of a point-kinetic verification scheme for nuclear reactor applications

Christophe Demazière (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; Victor Dykin ; Klas Jareteg (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers))
Journal of Computational Physics (0021-9991). Vol. 339 (2017), p. 396-411.
[Artikel, refereegranskad vetenskaplig]

In this paper, a new method that can be used for checking the proper implementation of time- or frequency-dependent neutron transport models and for verifying their ability to recover some basic reactor physics properties is proposed. This method makes use of the application of a stationary perturbation to the system at a given frequency and extraction of the point-kinetic component of the system response. Even for strongly heterogeneous systems for which an analytical solution does not exist, the point-kinetic component follows, as a function of frequency, a simple analytical form. The comparison between the extracted point-kinetic component and its expected analytical form provides an opportunity to verify and validate neutron transport solvers. The proposed method is tested on two diffusion-based codes, one working in the time domain and the other working in the frequency domain. As long as the applied perturbation has a non-zero reactivity effect, it is demonstrated that the method can be successfully applied to verify and validate time- or frequency-dependent neutron transport solvers. Although the method is demonstrated in the present paper in a diffusion theory framework, higher order neutron transport methods could be verified based on the same principles.

Nyckelord: Computational verification and validation; Time-dependent neutron transport; Frequency-dependent neutron transport; Diffusion theory; Neutron fluctuations; Neutron noise; Point-kinetics

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Denna post skapades 2017-03-27. Senast ändrad 2017-06-20.
CPL Pubid: 248689


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