Evaluation of coupled codes RELAP5/PARCS capability for BWR global stability prediction

Tomasz Kozlowski, Sean Roshan, Truc Nam Dinh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The present study is concerned with capability of a coupled neutron-kinetic/thermal-hydraulic code system RELAP5/PARCS for the numerical prediction of global core stability condition and instability transients. The work is motivated by the need to assess safety significance of a number of stability transients which trigger core instability and challenge reactor protection systems. The technical approach adopted is both to learn from real stability events and to perform analysis of idealized well-defined transients in a real plant and core configuration. In this paper, we show that the code system can serve as a unique and powerful tool to provide a consistent and reasonably reliable prediction of stability boundary even in complex plant transients. However, the prediction quality of the instability transients, i.e. core behavior without scram, namely parameters of the limit cycle remains questionable. We identify two main factors for future studies (two-phase flow regimes in oscillatory flow and algorithm for effective grouping of thermal-hydraulic channels) as key to enhancing the predictive capability of the existing coupled code system for BWR stability.

Original languageEnglish (US)
Title of host publicationProceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12
StatePublished - Dec 1 2007
Externally publishedYes
Event12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12 - Pittsburgh, PA, United States
Duration: Sep 30 2007Oct 4 2007

Publication series

NameProceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12

Other

Other12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12
CountryUnited States
CityPittsburgh, PA
Period9/30/0710/4/07

Keywords

  • BWR stability
  • Coupled codes
  • Global stability
  • RELAP5/PARCS

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Nuclear and High Energy Physics

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  • Cite this

    Kozlowski, T., Roshan, S., & Dinh, T. N. (2007). Evaluation of coupled codes RELAP5/PARCS capability for BWR global stability prediction. In Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12 (Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12).