Coupling of system thermal-hydraulics and Monte-Carlo method for a consistent thermal-hydraulics-reactor physics feedback
Wu, Xu
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https://hdl.handle.net/2142/45550
Description
Title
Coupling of system thermal-hydraulics and Monte-Carlo method for a consistent thermal-hydraulics-reactor physics feedback
Author(s)
Wu, Xu
Issue Date
2013-08-22T16:47:26Z
Director of Research (if dissertation) or Advisor (if thesis)
Kozlowski, Tomasz
Department of Study
Nuclear, Plasma, & Rad Engr
Discipline
Nuclear, Plasma, Radiolgc Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Monte Carlo
Thermal-hydraulics
Neutronics
Code coupling
Abstract
The present thesis describes the coupling of a three-dimensional continuous-energy Monte Carlo reactor physics code, Serpent, with thermal-hydraulics safety analysis code RELAP5-3D. Thermal-hydraulics and reactor physics coupling is
commonly used in deterministic methods, for example RELAP5/PARCS and TRACE/PARCS. It has been well-validated for a number of steady and transient problems. The coupling of Monte-Carlo and reactor thermal-hydraulics will significantly improve the MC predictive capability and its applicability to a wide range of reactor problems of practical interest, as right now it is limited to fixed-feedback conditions.
In this thesis, the coupled Serpent/RELAP5-3D code capability is demonstrated by the improved axial power distribution of single assemblies, achieved by a consistent thermal-hydraulics feedback. The code coupling is demonstrated for the UO2 and MOX single assemblies based on the OECD-NEA/NRC PWR MOX-UO2 Core Transient Benchmark [1]. Comparisons of calculation results using the coupled code with those from the individual codes in stand-alone mode, also with deterministic methods, specifically heterogeneous multi-group transport code DeCART, show that the coupling produces
more precise results.
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