Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Analyses of on-the-fly generation of spectral superhomogenization factors for multigroup whole core calculation employing pin-wise slowing-down solutions

  • Seungug Jae (Seoul National University, Department of Nuclear Engineering) ;
  • Han Gyu Joo (Seoul National University, Department of Nuclear Engineering)
  • Received : 2022.08.24
  • Accepted : 2022.11.10
  • Published : 2023.03.25
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Abstract

On-the-fly(OTF) generation of Spectral Superhomogenization(SSPH) factors is analyzed in the multigroup(MG) whole core calculation employing pin-wise continuous energy(CE) slowing-down solutions. The motivation for the work is to avoid the huge computing time required for the generation of a parametrized SSPH factor library(PSSL) which is used to resolve the angular dependency of MG resonance cross sections, and also to exploit the advantage of flexible choice of a MG structure by using CE slowing-down solutions. Two pin-wise CE slowing-down methods, the equivalent Dancoff cell method and the shadowing effect correction method, are evaluated with the OTF SSPH method. The effectiveness of the OTF SSPH method is examined for various simplified and realistic core problems with various MG structures. It is demonstrated that the computing time overhead of this method is negligible whereas the solution accuracy is considerably enhanced.

Keywords

Acknowledgement

This work was supported by National Research Foundation (NRF) of Korea (Grant No. 2021M2D6A1048220).

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