Validation of the Serpent 2-HEXTRAN-SMABRE code sequence in a VVER-1000 coolant transient

Silja Häkkinen (Corresponding Author), Elina Syrjälahti, Antti Rintala

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)


This paper presents a VVER-1000 coolant transient benchmark calculated using Serpent 2 generated group constants in the reactor dynamics code HEXTRAN coupled with the system code SMABRE. Two different sets of group constants applying different leakage correction methods are generated. The purpose of the paper is to validate the Serpent 2-HEXTRAN–SMABRE code sequence in plant transient calculations for a commercial VVER-1000 reactor. Calculated radial power distributions, relative fission power, mass flow rate and coolant heat-up are compared to experimental data. These factors, axial power distributions, radial and axial peaking factors and axial offset are also compared to results calculated using HELIOS generated group constants provided in the benchmark. Results calculated with Serpent generated group constants agree with the experimental data mostly within measurement uncertainty. Deviations larger than measurement uncertainty are explained by the insufficiency of available data needed for the HEXTRAN–SMABRE simulation or the albedo calculations.

Original languageEnglish
Pages (from-to)1167-1180
Number of pages14
JournalJournal of Nuclear Science and Technology
Issue number10
Early online date9 Jun 2020
Publication statusPublished - 2 Oct 2020
MoE publication typeA1 Journal article-refereed


  • benchmark
  • code sequence
  • cross section
  • group constant
  • hextran
  • Serpent
  • validation


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