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

1 Citation (Scopus)


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)
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


ConferenceInternational Conference on Mathematics and Computational Methods applied to Nuclear Science and Engineering
CountryUnited States


  • fission yield
  • GEF
  • RBWR
  • neutronics
  • radiotoxicity

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