Advanced Bondarenko method for resonance self-shielding calculations in deterministic reactor physics code system CBZ

Highlights: • The advanced Bondarenko method for resonance self-shielding calculations is devised and proposed. • A 107-group library for LWR applications based on this method is generated for a reactor physics code system CBZ. • Performance of the CBZ code with this library is examined against a suit of LWR cell problems. • The eigenvalues calculated with CBZ agree well with reference Monte Carlo solutions. - Abstract: The advanced Bondarenko method for resonance self-shielding calculations is devised and proposed. This method is based on three numerical methods; the Bell factor optimization for accurate fuel escape probability representation, extension of resonance interference factors and correction factors for current-weighted total cross sections. A 107-group library for light water reactor applications based on the advanced Bondarenko method is generated for a reactor physics code system CBZ. Performance of the CBZ code with this 107-group library is examined against a suit of light water reactor cell problems. The infinite neutron multiplication factors calculated with CBZ agree with reference continuous-energy Monte Carlo solutions within $0.15\%\Delta k/{\mathrm{kk}}^{\prime }$ differences, and no significant biases on fuel compositions and geometrical specifications are observed. Energy-averaged cross sections are also examined. Numerical tests reveal that significant accuracy improvements in resonance self-shielding calculations are realized by adopting the advanced Bondarenko method without any significant increase of computational burden.