Abstract
The heated junction thermocouple system (HJTS) measures reactor coolant liquid inventory with discrete heated junction thermocouple sensors located at different levels within a separator tube ranging from the top of the core to the reactor vessel head. The basic principle of system operation is the detection of a temperature difference between adjacent heated and unheated thermocouples utilizing a one-dimensional and two-phase flow concept. A liquid level sensing apparatus senses the level of liquid surrounding the apparatus. A plurality of axially spaced sensors is enclosed in a separator tube. The separator tube tends to collapse the level of a two-phase fluid within the separator tube into essentially a liquid phase and a gaseous phase where the collapsed level bears a relationship to the coolant inventory outside the separator tube. The level of the liquid phase is sensed by level sensing apparatus.
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