F4E Market Survey - ITER Neutral Beam Drift Duct

The main functions of the HNB Drift Duct are: • To accommodate the displacements and misalignments between the VVCD and the NB system (the NB Vessels being fixed to the building); • To be a first confinement boundary of the radioactive material present inside the tokamak; • To withstand the NB re-ionisation heat load; • To enable the installation, removal & maintenance of the NB line components and facilitate the Remote Handling operations; The HNB Drift Duct is made from the following main sub-components:  The DD Bellows ;  The DD-VVCD Flange (interfacing with the VVCD) including the Support Ring and Passages for water cooling pipes, Service Vacuum System (SVS), and feedthroughs ;  The DD-VVPSS Flange interfacing with the VVPSS Box including the passage for SVS pipes ;  The DD Liner ;  Electrical feedthrough for the Thermocouples (TC) and Heating Elements ;  The DD cooling piping in Stainless Steel (SS); the DD cooling piping is located inside the Drift Duct (this part is mainly brazed to DD-Liner), and outside the Drift Duct (a passage through the DD-VVCD flange is foreseen);  SVS piping (welded to the DD-VVCD flange and to the DD-VVPSS flange);  The DD Assembly Compression Tool.

External link to procurement, here