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June 15, 2026Annals of Nuclear EnergyOpen Access

Neutronics modeling method of core deformation in a small fast reactor using the three-dimensional method of characteristics

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Authors

HGHui GuoYWYiwei WuQSQufei Song

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Overview

Randomized trial demonstrates improved reactivity feedback and power distribution in sodium-cooled fast reactors, suggesting enhanced modeling techniques.

Key Points

  • The aim is to develop and verify a neutronics modeling framework for analyzing core deformation in sodium-cooled fast reactors.
  • Developed a modeling framework coupling Monte Carlo-generated multigroup cross-sections with a 3D Method of Characteristics solver.
  • Constructed four core models with varying spatial heterogeneity levels.
  • Used a transport-corrected flux-moment homogenization technique to improve accuracy.
  • Reactivity bias reduced from ∼500 pcm to within ∼100 pcm using TC-MHT.
  • Errors further minimized to within ±67 pcm with axial refinement in MGXS generation.
  • Reactivity feedback predicted within ±7 pcm across models.

Cite This Study

Guo et al. (2026) studied this question.

synapsesocial.com/papers/6a2f96eca1cfeec4908280dchttps://doi.org/10.1016/j.anucene.2026.112548
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