An improved model steam generator for simulating the conditions existing con- within a steam generator escalanatural

摘要

An improved model steam generator for simulating the conditions within a nuclear steam generator in order to monitor the condition of the heat exchange tubes and tubesheet of the nuclear steam generator is disclosed herein. The improved model steam generator includes a highly effective separator assembly for separating water droplets entrained within the steam flowing out of the outlet of the secondary side of the generator formed from a plurality of separator grids, each of which includes an array of semi-cylindrical deflector members. The grids are vertically stacked with the deflector members transversely disposed to the flow of steam generated by the model steam generator. Each of the parallel arrays of deflector members in each grid is angularly disposed approximately 45 DEG to the deflector members in the grids above it and below in order to provide a tortuous path for the flow of steam ascending therethrough. The separator assembly removes proportionately more water droplets from the steam generated by the model steam generator, which in turn allows it to accurately simulate the sludge accumulation characteristics of the nuclear steam generator being monitored. The model steam generator also includes a bankable condenser assembly which greatly enhances its turn-down ratio, as well as a feedwater pre-heater which allows it to accurately simulate the thermohydraulic conditions at a variety of points on the tubesheet of the nuclear steam generator.