Preliminary Test of the Three-Wire-TC Sodium-Temperature-Fluctuation Sensor for the Transit-Time-Flowmeter and for the Lmfbr Subassembly Early-Warning

The three-wire-TCs have been proposed to be replaced with the current outlet thermocouples to obtain much information from the limited number of sensors and to detect the local blockage in the LMFBR subassembly A preliminary application test of the new sensors to the transit-time flowmeter and to the early-warning of local blockage in the LMFBR subassembly is performed utilizing an existing sodium loop for the first time. Test proves that the new sensor is an excellent temperature-fluctuation sensor because of its high speed response and sharp point-sensitivity, and can improve perfoemance of a transit-time-flowmeter. Early-warning of local blockage in the LMFBR subassembly seems very promising. A concept for the subassembly outlet monitoring and a process-filter technique for reception of signals in background noise are discussed.