Energy-dependent fission yields in advanced reactors

Toni Kunchev, Eugene Shwageraus, Jaakko Leppänen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Fission product yields vary over incident neutron energies and between the different fissionable nuclides. An improved representation of this energy dependence could affect the assessment of advanced reactor designs which utilise a fast neutron spectrum. The present work involves the implementation of energy-weighted averaging of fission yields in various reactor unit cell models to determine its effect on neutronics, spent fuel decay power and radiotoxicity. The energy dependence is captured through the GEF code, which has enabled the estimation of fission product yields at any incident energy point. Yield
    values from 77 energy groups were condensed to a single value by preserving overall isotope production rate from fission. Unit cell investigations were performed with a modified version of the SERPENT Monte Carlo particle transport code. The results indicate that the neutronics and radiotoxicity implications of yield energy dependence is likely to be negligible in most reactor designs.
    Original languageEnglish
    Title of host publicationInternational Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019
    PublisherAmerican Nuclear Society ANS
    Pages710-718
    Number of pages9
    ISBN (Electronic)9780894487699
    ISBN (Print)978-0-89448-769-9
    Publication statusPublished - 1 Jan 2019
    MoE publication typeA4 Article in a conference publication
    EventInternational Conference on Mathematics and Computational Methods applied to Nuclear Science and Engineering - Portland, United States
    Duration: 25 Aug 201929 Aug 2019

    Conference

    ConferenceInternational Conference on Mathematics and Computational Methods applied to Nuclear Science and Engineering
    CountryUnited States
    CityPortland
    Period25/08/1929/08/19

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    Keywords

    • fission yield
    • GEF
    • RBWR
    • neutronics
    • radiotoxicity

    Cite this

    Kunchev, T., Shwageraus, E., & Leppänen, J. (2019). Energy-dependent fission yields in advanced reactors. In International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019 (pp. 710-718). American Nuclear Society ANS.