A multiscale approach to analyze the effect of radial void fraction distributions on BWR neutronic lattice parameters

Dean Price, Tomasz Kozlowski

Research output: Contribution to journalArticlepeer-review

Abstract

The aim of this study is to analyze the effect of radial void fraction distribution, considered at three degrees of fidelity, on lattice k and 2-group homogenized cross sections. The novelty of this work lies in its use of experimentally-determined radial void fraction distributions which allows for fine-scale coolant density data with no predictive uncertainty and which could be prohibitively expensive to simulate over the range of operational parameters used in the experiments. The experimentally-determined radial void fraction distributions are also characterized using a statistical tool called a semi-variogram in order to determine the scale of continuity. Void fraction distributions are averaged at the lattice and subchannel level for comparison with the fine-scale model. Models averaged at the subchannel and lattice level show a difference in k about 68% of the time. Also, by comparing 2-group homogenized cross-sections, the differences between the subchannel and homogeneous cases are measurable.

Original languageEnglish (US)
Article number107988
JournalAnnals of Nuclear Energy
Volume152
DOIs
StatePublished - Mar 2021

Keywords

  • BFBT
  • BWR
  • Criticality
  • Cross-sections
  • Neutronics
  • Serpent 2
  • Void fraction

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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