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Apr 19 – 22, 2022
Vienna, Austria
Europe/Vienna timezone
FR22 starts in Vienna 19 - 22 April 2022 Online Stream:

Verification of the SPL module of the neutron diffusion code AZNHEX through Neutronics Benchmark of CEFR Start-Up Tests

Apr 20, 2022, 11:04 AM
Vienna, Austria

Vienna, Austria

ORAL Track 6. Modelling, Simulations, and Digitilization 6.1 Neutronics


Dr Roberto Lopez-Solis (National Institute for Nuclear Research)


AZNHEX is a deterministic code that solves the neutron diffusion equation with Hexagonal-Z geometry. It is part of the AZTLAN Platform, an initiative gathering the leading Mexican universities and nuclear energy research centers aimed to position Mexico in the midterm as a nuclear code developer for reactor core analysis and design. To tackle the challenges of a small core, like CEFR, with high leakage and significant anisotropic scattering effects, a new module for the AZNHEX code was recently developed based on the Simplified Spherical Harmonics (SPL) scheme. In this paper, to verify the SPL implementation and assess its usefulness,the results of the AZNHEX code with this new solver are shown and compared with the ones produced with the diffusion version; furthermore, comparisons against experimental data and the stochastic code SERPENTare presented. The cases simulated consisted ofa selection of the start-up tests performed in the Chinese Experimental Fast Reactor Benchmark proposed by the IAEA-CIAE. The nodal homogenized macroscopic cross-sections (XS) were generated through full core heterogeneous models in the stochastic code SERPENT using a novel methodology that is presented in another dedicated paper. The results obtained showed a great improvement compared with the diffusion solverreducing the deviations significantly from experimental data and stochastic results.

Affiliation/Organization National Institute for Nuclear Research
Speaker's email address
Country/Int. organization Mexico
Speaker's title Mr

Primary authors

Dr Roberto Lopez-Solis (National Institute for Nuclear Research) Mr Guillermo Muñoz-Peña (National Polytechnic Institute) Dr Edmundo Del Valle Gallegos (INSTITUTO NACIONAL DE INVESTIGACIONES NUCLEARES (On Sabbatical Leave from IPN-Mexico)) Dr Armando Miguel Gomez-Torres (Instituto Nacional de Investigaciones Nucleares) Juan Galicia-Aragon Dr Javier Palacios-Hernandez (National Institute for Nuclear Research)

Presentation materials

Peer reviewing