Abstract
In this paper, RELAP5 code is selected to study the measuring characteristics of the double reference tube level gauge which is commonly used in high temperature and high pressure vessels on marine nuclear power platforms under steady and transient depressurization conditions. The response characteristics of water-level gauge influenced by the reference cup supply water flow rate under the condition of rapid depressurization is discussed. Measurement error and accuracy of the water-level measuring device are analyzed under both steady and transient conditions. The simulation results indicate that the relative error of the double reference tube level gauge is about 0.79 % in steady state, while the measurement error is too large to accurately obtain the level in the vessel under transient depressurization condition. However, the relative measurement error can reach about 10% under the condition of small depressurization rate.
Highlights
The water-level is crucial for some high temperature and high-pressure equipment of the PWR primary system, such as the steam generator and pressurizer
A simulation model of RELAP5 code is established for the double reference tube level gauge
The measuring characteristics of the differential pressure waterlevel measurement system are analyzed under both steady state condition and transient depressurization condition
Summary
The water-level is crucial for some high temperature and high-pressure equipment of the PWR primary system, such as the steam generator and pressurizer. When the external waterlevel measurement method is used for level measurement of marine high temperature and high pressure vessels, there are four influencing factors (1) the distance of the reference tube from the central axis of the vessel; (2) the radius of the vessel; (3) the density of the liquid; and (4) the inclination. In order to improve the measurement accuracy of the differential pressure water-level gauge, some scholars have improved the structure of the level measurement device and developed the double reference tube level gauge (CGN Research Institute Co. Ltd., 2018a,b). In this paper, the RELAP5 code was selected to study the measuring characteristics of the double reference tube level gauge under steady state and transient depressurization conditions, and the code was used to explore the influence of changing the supply water flow on the measurement results under transient depressurization conditions as well
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