TITLE:
Validation of RELAP5/MOD3.2 Code for Flashing-Induced Instabilities in a Single Channel
AUTHORS:
Hamed Atajafari, Mohammadreza Nematollahi, Mehdi Hashemi-Tilehnoee, Nasim Rafiee
KEYWORDS:
SBWR, Flashing-Induced Instabilities, Start-Up Condition, RELAP5/MOD3.2, Experimental Test Facility
JOURNAL NAME:
World Journal of Nuclear Science and Technology,
Vol.5 No.1,
January
8,
2015
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.