TRACE/PARCS Validation for BWR Stability Based on OECD/NEA Oskarshamn-2 Benchmark
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
B13-1 Development, Assessment and Applications of TRACE

Tomasz Kozlowski (Royal Institute of Technology)
Sean Roshan (Royal Institute of Technology)
Tomas Lefvert (Royal Institute of Technology)
Thomas Downar (University of Michigan)
Yunlin Xu (University of Michigan)
Aaron Wysocki (University of Michigan)
Kostadin Ivanov (Pennsylvania State University)
Jeffrey Magedanz (Pennsylvania State University)
Matthew Hardgrove (Pennsylvania State University)
Christer Netterbrant (Oskarshamn Nuclear Power Plant)
Jose March-Leuba (Oak Ridge National   


On February 25, 1999, the Oskarshamn-2 NPP experienced a stability event, which culminated in diverging power oscillations with decay ratio greater than 1.3. The event was successfully modeled by TRACE/PARCS coupled code system and the details of the modeling and solution are described in the paper. The obtained results show excellent agreement with the plant data, capturing the entire behavior of the transient including onset of instability, growth of oscillation (decay ratio) and the oscillation frequency. The event allows coupled code validation for BWR with a real, challenging stability event, which challenges accuracy of neutron kinetics (NK), thermal-hydraulics (TH) and TH/NK coupling. The success of this work has demonstrated the ability of 3-D coupled code systems to capture the complex behavior of BWR stability events. The problem is released as an international OECD/NEA benchmark, and it is the first benchmark based on measured plant data for a stability event with a DR greater than one. Interested participants are invited to contact authors for more information.

Individual Conference-Paper Copies (Electronic Where Available):

  • For CNS members, the first 5 copies per calendar year are free, and additional copies are $10 each.
  • For non-members, the price is $25 for the first Conference-paper copy in a request, and $10 each for additional copies of papers in the same conference and in the same request.
  • Contact the CNS office to order reprints.