Système innovant non-intrusif de mesures haute température pour le fluide et la paroi de conduites
EDF R&D, EDF Lab Chatou 6 quai Watier 78101 Chatou, France
EDF is a major operator of Nuclear Power Plants (NPP). EDF R&D conducts researches on non-intrusive techniques able to measure temperature inside and outside a pipe. In order to test two of them, a trial was conducted on AREVA JSPM test loop. This loop can create the primary loop conditions (155 bars, 290°C, 22000 m3/h). The two tested systems were: a fiber optic based for surface temperature measurement and an ultrasonic device for water temperature measurement. They have been used in heterogeneous area, due to the cooling system. Both systems have been compared to the loop internal measurement system and to classical thermocouples for surface temperature. The first system is an optical fiber placed under the heat insulator. Temperature is measured all along the full length of the fiber, with a 0.25 m spatial step thanks to a DTS (Distributed Temperature Sensor) using Raman effect. This system has successfully provided surface temperature cartography of the mixing zone. The second system uses ultrasonic probes to compute the speed of sound in the water. As pressure is known, temperature can be calculated from this celerity. This system enables the non-intrusive measurement of the water temperature in industrial conditions, and is especially effective when temperature is heterogeneous, as it provides a temperature average. Results show a very good agreement between this measurement and internal probes.
© Owned by the authors, published by EDP Sciences, 2015
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