“…This paper describes the main activities carried out during the first stage of the contract which includes the development of the manufacturing route, engineering analysis, manufacturing conceptual and detail design, mock-ups, welding and NDT qualifications. A parallel paper at this conference describes the management of the procurement [1]. The VV safety is assured by the RCC-MR code, originally written for French fast reactors, which includes an appendix devoted to ITER VV.…”