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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