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 U resonances.
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