Assessment of High-Temperature Measurements for Use in the Gas Test Loop

Wilkins, S. Curt ; Evans, Robert P.

Idaho National Laboratory

关键词: Thermocouples;    Alloys;    Ultrasonic Waves Gas Test Loop;    Irradiation;    Molybdenum;   

DOI  :  10.2172/911736
RP-ID  :  INL/EXT-05-00298
RP-ID  :  DE-AC07-99ID-13727
RP-ID  :  911736

美国|英语

来源: UNT Digital Library

【 摘 要 】

Temperature transducers capable of control and test measurements in the 1400-1800¢ªC range in the fast neutron irradiation environment of the Gas Test Loop are evaluated. Among the instruments discussed are high-temperature thermocouples, resistance temperature detectors, ultrasonic thermometers, noise thermometers, and optical temperature sensors. High-temperature capability, behavior under irradiation, technical maturity, cost, and availability are among the key factors considered in assessing the relative merits of each measurement method. In the near term, the doped molybdenum versus niobium-zirconium alloy thermocouple is deemed to be best suited to the in-pile test and control requirements. Additional characterization of this thermocouple combination is needed to ensure confidence in its performance. Use of tungsten-rhenium alloy thermocouples, with specific disadvantages noted, constitutes the recommended back-up position.