Abstract
In the event of a LOCA (loss-of-coolant accident) resulting from a hypothetical guillotine break in the suction line of the PLR (primary loop recirculation) pump for a BWR plant, the PLR pump will be reversely driven by the two-phase fluid flowing back at high speed in the line. For clarifying the two-phase flow characteristics of the PLR pump, which would be necessary for the analysis of pump behavior during LOCA, blowdown tests were conducted using three scale model pumps. The two-phase flow characteristics data for the pump were plotted with use of homologous curves method and the two-phase degradation multiplier in order to examine the effect of specific speed and void fraction. As a result of this study, it was shown that the characteristics of any pump with specific speed between N s=500 and 4,200 rpm·gpm1/2/ft3/4 can be obtained by interpolation. Experimental analyses were made using the TRAC code. Analytical results regarding pump inlet pressure, void fraction, volumetric flow rate and pump speed ...
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