소듐냉각고속로를 위한 온도 영향 보정형 압력전송기 개념 개발

Abstract

The sodium maintains the liquid phase in wide range of temperature and its heat transfer characteristics are excellent. It can be used as a coolant for heat transport system such as sodium-cooled fast reactors. However, the operating temperature is high and it must be isolated to prevent chemical reaction due to its high reactivity. The pressure is one of the key I&C factors to monitor and control the thermal-fluidic system and so the sensing technology for liquid sodium is very important. For the pressure sensor for liquid sodium, NaK-filled type pressure transmitter which uses NaK as a pressure transfer material has been developed and generally used. For the NaK-filled type, effect of temperature is required to be minimized and compensated since thermal expansion of inner pressure transfer material affects output signal at high temperature. In this study, a novel concept of diaphragm type pressure transmitter is proposed for compensating temperature effect. A temperature compensated concept for pressure transmitter is verified by experiments using a set-up which enables temperature and pressure control of a chamber.