Liquid lead-lithium (Pb-16Li) is of primary interest as one of the candidatematerials for tritium breeder, neutron multiplier and coolant fluid in liquidmetal blanket concepts relevant to fusion power plants. For an effective andreliable operation of such high temperature liquid metal systems, monitoringand control of critical process parameters is essential. However, limitedoperational experience coupled with high temperature operating conditions andcorrosive nature of Pb-16Li severely limits application of commerciallyavailable diagnostic tools. This paper illustrates indigenous calibration testfacility designs and experimental methods used to develop non-contactconfiguration level diagnostics using pulse radar level sensor, wettedconfiguration pressure diagnostics using diaphragm seal type pressure sensorand bulk temperature diagnostics with temperature profiling for hightemperature, high pressure liquid Pb and Pb-16Li applications. Calibrationcheck of these sensors was performed using analytical methods, at temperaturebetween 380C-400C and pressure upto 1 MPa (g). Reliability and performancevalidation were achieved through long duration testing of sensors in liquid Pband liquid Pb-16Li environment for over 1000 hour. Estimated deviation forradar level sensor lies within [-3.36 mm, +13.64 mm] and the estimated errorfor pressure sensor lies within 1.1% of calibrated span over the entire testduration. Results obtained and critical observations from these tests arepresented in this paper.
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