Models For Resonance Self-Shielding Calculation in Neutronic Analysis of the CANDU-SCWR Fuel Channel

Abstract

We present the complete CANDU-SCWR model developed for the DRAGON code. A particular attention is brought to the development of the geometries used for resonance self-shielding calculations in the cases of single lattice and 2x2 assembly simulations. The study of the multiplication constant has shown that it is possible to use a simplified geometry for the resonance self-shielding calculation in assembly calculations. Finally, comparisons of the multiplication constant, neutron spectra and reaction rates obtained for different lattice pitches have demonstrated the importance of radiative captures in 238U resonances.