Developments in remote metrology at JET

The need to maximise the operational availability of fusion devices has driven the enhancements in accuracy, flexibility and speed associated with the inspection techniques used at JET. To this end, the remote installation of the ITER-Like Wall (ILW) tiles, conduits and embedded diagnostics has nece...

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Bibliographic Details
Published in:Fusion engineering and design 2011-10, Vol.86 (9), p.1855-1858
Main Authors: Mindham, T.J., Sandford, G.C., Hermon, G., Belcher, C., Pace, N.
Format: Article
Language:English
Subjects:
Accuracy
Applied sciences
Controled nuclear fusion plants
Design engineering
Devices
Energy
Energy. Thermal use of fuels
Exact sciences and technology
ILW
Installations for energy generation and conversion: thermal and electrical energy
ITER
JET
Metrology
Photogrammetry
Remote handling
Stereophotogrammetry
Tiles
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Summary:The need to maximise the operational availability of fusion devices has driven the enhancements in accuracy, flexibility and speed associated with the inspection techniques used at JET. To this end, the remote installation of the ITER-Like Wall (ILW) tiles, conduits and embedded diagnostics has necessitated the adoption of technologies from other industries for their use in conjunction with the JET Remote Handling (RH) system. The novel adaptation of targetless stereophotogrammetry, targeted single-camera photogrammetry and gap measurement techniques for remote applications has prompted a range of challenges and lessons learnt both from the design process and operational experience. Interfacing Commercial Off-The-Shelf (COTS) components with the existing RH equipment has highlighted several issues of relevance to the developing ITER RH system. This paper reports results from the stereophotogrammetry and the single-camera photogrammetry surveys, allowing analysis of the effectiveness of the RH system as a platform for in-vessel measurement. This includes scrutiny of the accuracy achieved with each technique as well as the impact on the in-vessel Configuration Management Model (CMM). The paper concludes with a summary of key recommendations for the ITER RH system based on the experience of remote metrology at JET.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2010.11.011