Validation of RELAP5/MOD3.2 Code for Flashing-Induced Instabilities in a Single Channel
- 1 Engineering and Manufacturing Division, Iran Sanaat Industrial Group, Shiraz, Iran
- 2 School of Mechanical Engineering, Shiraz University, Shiraz, Iran
- 3 Department of Engineering, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran
- 4 Department of Engineering, Bushehr Branch, Islamic Azad University, Bushehr, Iran
Abstract
This paper reports on the modeling and simulation of flashing-induced instabilities in naturalcirculation systems, with special emphasis on simplified boiling water reactors (SBWRs). In this work, flashing-induced oscillations have been studied by using an experimental test facility (SIRIUS-N) and RELAP5/MOD3.2 thermal hydraulic code. The behavior of the test facility is investigated for different values of core inlet temperature value. The results of the simulations have been compared qualitatively and quantitatively with experiments. In general, deviations are found between the numerical and experimental results, in spite of the close similarity between the SIRIUS-N facility and the definition of the system in the RELAP code. This result indicates that predictions regarding experimental facility, based on modeled system, should be carefully considered.
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