| Issue |
EPJ Web Conf.
Volume 247, 2021
PHYSOR2020 – International Conference on Physics of Reactors: Transition to a Scalable Nuclear Future
|
|
|---|---|---|
| Article Number | 04001 | |
| Number of page(s) | 12 | |
| Section | Monte Carlo Transport | |
| DOI | https://doi.org/10.1051/epjconf/202124704001 | |
| Published online | 22 February 2021 | |
https://doi.org/10.1051/epjconf/202124704001
ENHANCING THE PERFORMANCE OF FISSION SOURCE CONVERGENCE WITH FUNCTIONAL EXPANSION TALLIES IN SERPENT 2 MONTE CARLO CODE
1 LUT University P.O. Box 20, FI-53851 Lappeenranta, Finland
2 VTT Technical Research Centre of Finland, Ltd. P.O. Box 1000, FI-02044 VTT, Finland
Corresponding author.
Ana.Jambrina@lut.fi
Jaakko.Leppanen@vtt.fi
Heikki.Suikkanen@lut.fi
Published online: 22 February 2021
This paper presents an upgrade to the built-in response matrix based solver implemented in Serpent 2 Monte Carlo code aiming to improve the fission source convergence when obtaining the forward solution to the k-eigenvalue criticality source problems. The functional expansion tallies are introduced in an attempt to improve the accuracy of the cell-wise form factors that feed the response matrix solver, replacing the current mesh-based approach. The functional expansion tallies reconstruct the binning surface and collision tallies, by using high-order series expansion to represent the original and continuous spatial distributions. This new feature is implemented to Serpent 2 and tested by single-assembly and full-core PWR calculations (BEAVRS benchmark). The results show enhanced performance of the convergence acceleration methodology based on an improved initial guess of the fission source.
Key words: Monte Carlo / source convergence / acceleration / Serpent 2 / functional expansion tallies
© The Authors, published by EDP Sciences, 2021
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