Abstract
Reduced-Moderation Water Reactor (RMWR) will be operated under low core water volume and low water flow rate. In RMWR, Water-to-fuel volume ratio (V_m/V_f) is reduced less than 0.5,in comparison with the values of 2∿3 in the current light water reactors. Thereby, there is a need to research the cooling limit. Experimental research on CHF in tight lattice bundles that simulates the actual RMWR have been carried out in JAERI. This paper will focus on the verification of existing CHF correlation for the tight lattice bundle. The Arai correlation is verified with BAPL data and JAERI data and is found that it can not give satisfied CHF prediction to the RMWR working condition.
