Space-time convergence analysis on BWR stability using TRACE/PARCS

Ivan Gajev, Weimin Ma, Tomasz Kozlowski

Research output: Contribution to journalArticlepeer-review


Unstable behavior of Boiling Water Reactors (BWRs) is known to occur during operation at certain power and flow conditions. Even though BWR instability is not a severe safety concern, it could cause reactor scram and significantly decrease the economic performance of the plant. This paper aims to (a) quantify TRACE/PARCS space-time discretization error for simulation of BWR stability, (b) establish space (nodalization) and time discretization necessary for space-time converged model and (c) show that the space-time converged model gives more reliable results for both stable and unstable reactor. The space-time converged model is obtained when further refinement of numerical discretization parameters (nodalization and time step) has negligible effect on the solution. The study is significant because performing a space-time convergence analysis is a necessary step of qualification of the TRACE/PARCS model, and use of the space-time converged model increases confidence in the prediction of BWR stability.

Original languageEnglish (US)
Pages (from-to)295-306
Number of pages12
JournalAnnals of Nuclear Energy
StatePublished - Jan 2013


  • BWR stability
  • Coupled TRACE/PARCS analysis
  • Space-time convergence

ASJC Scopus subject areas

  • Nuclear Energy and Engineering


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