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The Pseudo-Resonant Isotope Model for Predicting the Resonance-Interference Effect in Self-Shielding Calculation

Abstract of the technical paper/presentation presented at:
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering
April 16–20, 2017

Prepared by:
Wei Shen
Canadian Nuclear Safety Commission


The Bondarenko iteration method and the resonance-interference factor have been widely used to predict the resonance-interference effect in self-shielding calculation. However, these methods not only bring errors into self-shielding results in a specific situation but also cost considerable computational efforts. The pseudo-resonant isotope model (PRIM) is proposed for lumping together the resonances in the resonant mixture to form a pseudo-resonant isotope and generate the resonance integral in the multi-group library. Numerical results show that PRIM is capable of thoroughly and very efficiently settling the resonance-interference issue, by reforming the calculation scheme of conventional self-shielding procedures. PRIM is also a universal technique that can be coupled with many self-shielding methods based on the multi-group structure and it can be easily implemented in the existing code or new lattice-physics code. PRIM also has strong potential in large-scale self-shielding tasks, such as a direct full-core self-shielding calculation.

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