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Fusion Science and Technology
Latest News
College students help develop waste-measuring device at Hanford
A partnership between Washington River Protection Solutions (WRPS) and Washington State University has resulted in the development of a device to measure radioactive and chemical tank waste at the Hanford Site. WRPS is the contractor at Hanford for the Department of Energy’s Office of Environmental Management.
P. Qi, S. G. Qing, Q. Li, G.-N. Luo
Fusion Science and Technology | Volume 61 | Number 4 | May 2012 | Pages 314-320
Technical Paper | doi.org/10.13182/FST12-A13585
Articles are hosted by Taylor and Francis Online.
With increases in the heating and driving power in EAST, the present SiC-C plasma-facing components (PFCs) will be replaced by W coatings on actively cooled Cu heat sinks in the lower-heat-flux zone (first wall), prepared by vacuum plasma spraying, and by ITER-like W-Cu monoblocks in the higher-heat-flux zone (divertor). These components are provided with thousands of joints that should be assessed to demonstrate their integrity. An ultrasonic method named pulse echo using high-frequency probes and normal incidence of the ultrasonic beam to the joint interface has been developed. For the W-coating PFC, although the existence of porous structure, shrinkage cracks, and delamination in W coating can adversely affect the sensibility of detecting interface defects, the ultrasonic technique is able to detect, locate, and size them in certain conditions; for the W-Cu monoblocks, the ultrasonic technique is also able to detect, locate, and size defects in the W-oxygen-free high conductivity (OFHC) Cu interface, but further detecting and analysis should be carried out for the OFHC Cu-CuCrZr interface based on the preliminary work.