Enhancing the performance of fission source convergence with functional expansion tallies in Serpent 2 Monte Carlo code

Ana Jambrina, Jaakko Leppänen, Heikki Suikkanen

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)676-687
Number of pages12
JournalEPJ Web of Conferences
Volume247
DOIs
Publication statusPublished - 2020
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Physics of Reactors, PHYSOR 2020: Transition to a Scalable Nuclear Future - Cambridge, United Kingdom
Duration: 28 Mar 20202 Apr 2020

Keywords

  • Acceleration
  • Functional expansion tallies
  • Monte Carlo
  • Serpent 2
  • Source convergence

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