Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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A new Tone's method in APOLLO3® and its application to fast and thermal reactor calculations

  • Mao, Li (DEN-Service d'etudes des reacteurs et de mathematiques appliquees (SERMA), CEA, Universite Paris-Saclay) ;
  • Zmijarevic, Igor (DEN-Service d'etudes des reacteurs et de mathematiques appliquees (SERMA), CEA, Universite Paris-Saclay)
  • Received : 2017.06.15
  • Accepted : 2017.08.03
  • Published : 2017.09.25
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Abstract

This paper presents a newly developed resonance self-shielding method based on Tone's method in $APOLLO3^{(R)}$ for fast and thermal reactor calculations. The new method is based on simplified models, the narrow resonance approximation for the slowing down source and Tone's approximation for group collision probability matrix. It utilizes mathematical probability tables as quadrature formulas in calculating effective cross-sections. Numerical results for the ZPPR drawer calculations in 1,968 groups show that, in the case of the double-column fuel drawer, Tone's method gives equivalent precision to the subgroup method while markedly reducing the total number of collision probability matrix calculations and hence the central processing unit time. In the case of a single-column fuel drawer with the presence of a uranium metal material, Tone's method obtains less precise results than those of the subgroup method due to less precise heterogeneous-homogeneous equivalence. The same options are also applied to PWR UOX, MOX, and Gd cells using the SHEM 361-group library, with the objective of analyzing whether this energy mesh might be suitable for the application of this methodology to thermal systems. The numerical results show that comparable precision is reached with both Tone's and the subgroup methods, with the satisfactory representation of intrapellet spatial effects.

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References

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