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Fusion Science and Technology
The Sodium Reactor Experiment
In February 1957, construction was completed on the Sodium Reactor Experiment (SRE), a sodium-cooled, graphite-moderated reactor with an output of 20 MWt. The design of theSRE had begun three years earlier in 1954, and construction started in April 1955. On April 25, 1957, the reactor reached criticality, and the SRE operated until February 1964.
A. Chobriat, O. Raphaël, C. Hermerel, E. Busvelle, A. Choux, P. Merillot, L. Reverdy, M. Theobald
Fusion Science and Technology | Volume 73 | Number 2 | March 2018 | Pages 132-138
Technical Paper | doi.org/10.1080/15361055.2017.1374813
Articles are hosted by Taylor and Francis Online.
The Digital Holographic Microscopy (DHM) technology allows fast three-dimensional (3-D) surface image acquisition in order to characterize and quantify defects on microshell outer surface. This device captures holograms and reconstructs a double image, one for the intensity and another for the phase. Depending on the used objective lens (20× or 50×) and the microshell diameter, several hundred or thousand pictures must be taken to cover both hemispheres (1170 pictures for a 2200-µm-diameter capsule). A specific handling system using two rotation axes has been developed to acquire automatically all 3-D hemispherical data without any manipulation.
A new version of the 3-D surface rebuilding (using images stitching) and analyzing software is used to characterize (diameter and height measurement) and to localize individual defects, such as bumps or pits. Using a new version of the dedicated software, the pictures are filtered and stitched together to perform a 3-D surface mapping of the capsule. Postprocessing routines are able to detect defects and to sort them out. Specific tools are also dedicated to the characterization of polishing defects, such as concave or clustered defects.
In addition to this, a study of the DHM metrology capabilities, including a comparison with a calibrated atomic force microscope, has been led.