Enhancing the Performance of Fission Source Convergence with Functional Expansion Tallies in Serpent 2 Monte Carlo Code

Ana Jambrina (Corresponding author), Jaakko Leppänen, Heikki Suikkanen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-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
Title of host publicationProceedings of the International Conference on Physics of Reactors, PHYSOR 2020
Subtitle of host publicationTransition to Scalable Nuclear Energy
PublisherAmerican Nuclear Society (ANS)
Number of pages12
ISBN (Print)978-1-5272-6447-2
Publication statusPublished - 2020
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Physics of Reactors, PHYSOR 2020: Cancelled - Cambridge, United Kingdom
Duration: 29 Mar 20202 Apr 2020
https://www.physor2020.com/

Conference

ConferenceInternational Conference on Physics of Reactors, PHYSOR 2020
CountryUnited Kingdom
CityCambridge
Period29/03/202/04/20
OtherCancelled
Internet address

Keywords

  • Kraken
  • SMR
  • shutdown margin
  • reactivity coefficient
  • reactivity worth

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