Ultrasonic test results before and after high heat flux testing on W-monoblock mock-ups of EU-DEMO vertical target

•Comparative study between different divertor target designs by ultrasonic tests.•Possible correlations between tube corrosion and swirl tape clearance.•Onset of porosity in the casted interlayer and detachments in the hipped interlayer.•Influence of the thickness of the interlayer on manufacturing...

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Bibliographic Details
Published in:Fusion engineering and design 2020-11, Vol.160, p.111886, Article 111886
Main Authors: Roccella, S., Dose, G., Barrett, T., Cacciotti, E., Dupont, L., Gallay, F., Greuner, H., Richou, M., Tatì, A., Visca, E., You, J.-H.
Format: Article
Language:English
Subjects:
DEMO divertor
Fatigue tests
Heat flux
Heat transfer
High heat flux testing
Interlayers
Mockups
Non-destructive examination
Nuclear power plants
Plasma-facing components
Thermal barriers
Thermal fatigue
Tungsten
Ultrasonic testing
Ultrasonic tests
W monoblocks
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Summary:•Comparative study between different divertor target designs by ultrasonic tests.•Possible correlations between tube corrosion and swirl tape clearance.•Onset of porosity in the casted interlayer and detachments in the hipped interlayer.•Influence of the thickness of the interlayer on manufacturing (residual stress) and fatigue behavior.•0.5 mm thick functional gradient interlayer has shown great promise to extend the component life time. In the framework of the activity of target development of the European DEMO divertor, ENEA carried out an extensive ultrasonic testing campaign on more than 66 tungsten monoblock mock-ups. The EU-DEMO target development activity concerns primarily the comparison between the reference solution for the divertor targets (ITER-like) and two other concepts (Thermal Break Interlayer, Functionally Graded Interlayer), in which the interlayer between monoblocks and tube has been modified with the aim of increasing the component performance. In the same activity, many other aspects were also considered such as analyzing the influence of the tungsten monoblock supplier, interlayer thickness and interlayer manufacturing process (casting or diffusion bonding). Mock-ups were provided by ENEA (ITER-Like), CEA (Thin Graded Interlayer) and CCFE (Thermal Break Interlayer) and tested to thermal fatigue by high heat flux in the GLADIS facility in IPP – Garching center under DEMO relevant conditions. In this work the comparison between UT results obtained before and after the high heat flux test for the more significant mock-ups for phase 2 are carried out. After testing, mock-ups were cut in order to conduct post-mortem analyzes. Substantial agreement is found with UT results.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2020.111886