A collaboration of leading engineers and scientists will work together to create the world's largest tokamak: ITER


The ITER vacuum vessel is an innovating nuclear pressure vessel, weighting as much as the EIFFEL Tower, with sizes and tight tolerances never matched before. It is built from a specially developed stainless steel, making use of state of the art joining and NDT technologies. It is designed and built according to RCC-MR code, ESPN (French Nuclear Pressure Components) standard and French safety rules.

The AMW grouping, formed by Ansaldo Nucleare, as leader, Mangiarotti and Walter Tosto, was awarded (2010) the contract for the supply of five sectors of ITER Vacuum Vessel, the single biggest contract of Europe's in-kind contribution to ITER. The AMW grouping is a quite innovative form of cooperation, with a single strong management team which coordinates all the joint activities of the three partners, with the aim to allow for maximum synergies (and then optimal risk management) among the two manufacturing companies inside the grouping, which retain individual responsibility for the in-house manufacturing works. In the frame of the grouping , Ansaldo Nuclear is in charge of project management, engineering coordination, control and quality of process and products, material procurement management, manufacturing supervision, dimensional control implementation and NDE qualification.



The divertor is a device within the ITER located at the bottom of the vacuum vessel. The divertor faces the hot plasma and extract the heat generated by the fusion reaction out of the reactor and prevent the risk of heat damage. The divertor also controls the plasma purity extracting waste gas and impurities while the reactor is in operation. This prevents the build up of fusion products and impurities in the plasma. Impurities slow the reaction down, making their removal crucial to safe and effective operation.

The ITER divertor is made up of many parts, including the cassette body (CB) and three plasma-facing components (PFCs). The three PFCs are the:

  • Inner vertical target (IVT)
  • Outer vertical target (OVT)
  • Dome liner (DL)

Ansaldo Nucleare had in charge the pre-production qualification for the procurement of the ITER Divertor Inner Vertical Target (IVT). The scope basically includes engineering activities and the manufacturing of one (1) full-scale full-W  IVT prototype

It also covers the manufacturing of:

  • one Testing Frames and six (6) dummy units for the High Heat Flux testing of the Plasma Facing Units.
  • Three additional full-scale full W PFUs
  • One dummy full-scale full W PFU
  • three W calibrations blocks,
  • ten Tube transition samples (TTS)


Engineering for Fusion

Ansaldo Nucleare provides a large range of Engineering services aimed at Design and Manufacturing support for the Fusion projects.

Engineering for Design support

  • Thermal (steady state and transient) and Mechanical (elastic and elastoplastic) structural analysis using finite element method technique.
  • Electromagnetic analysis to assess the structural implications of the plasma conditions.
  • Neutronic analysis to calculate the neutronic heat deposition, the material activation, the material damage (dpa).
  • Computational fluid dynamic analysis: to calculate pressure drop, flow rate, heat transfer coefficient, draining and drying, using 1D and 3D CFD codes
  • Structural Integrity Justification using of relevant design and manufacturing codes (e.g. ASME, RCC-MR, RCC-MRx or EN standards)

Engineering for Manufacturing Support

  • Preparation of Manufacturing documentation using the relevant design and manufacturing codes (e.g. ASME, RCC-MR, RCC-MRx or EN standards)
  • Non-destructive testing.
  • Tolerances chain definition and metrology.
  • Manufacturing activities follow-up.