TF coils winding packs cold test and insertion into the coil cases

The European Joint Undertaking for ITER and the Development of Fusion Energy ("Fusion for Energy")

The subject of the Contract is the performance of the cold test of 10 Winding Pack (WP) and the insertion process of 10 Toroidal Field (TF) coils as defined in the Technical Specifications.
The TF coils have a “D” shape and are composed by a winding pack (WP) enclosed in a coil case (CC).
A WP consists of a set of 7 double pancake (DP) 5 regular (with same number of turns on each side) DP and 2 side DP (with different number of turns in the 2 sides and with a trapezoidal shape). Each DP is made from a single length of Cable-in-Conduit-Conductor, embedded in a 316LN grooved stainless steel plate called radial plate (RP), composed of about 900 Nb3Sn superconductor and 450 copper strands enclosed in a 2 mm stainless steel thick jacket. The DP modules are electrically connected with each other by joints and the electrical feeders by the coil terminals. The conductor is electrically insulated from the radial plate with about 2 mm of multi layer glass-Kapton while each DP is insulated with about 1 mm of glass Kapton both filled with epoxy resin by Vacuum Pressure Impregnation (VPI). In order to manufacture the WP, the 7 DPs are stacked, connected electrically by completing the electric joints, then the stack is insulated with about 6 mm of insulation formed by several layers of half lapped glass-Kapton, and finally vacuum pressure impregnated with epoxy resin. Finally a conductive paint is applied to the external surface of the WP. The total weight of the WP is approximately of 110t.
The most important parameter of the WP is the position of the Current Center Line – CCL. The control of its position and shape it is fundamental in terms of plasma operation. The CCL is the current barycentre of the WP and is a closed line along the D-shape. Its position is measured in the last stage of the WP manufacturing process and then marks (fiducials) are placed on the WP outer surface to indicate its positions.
The winding pack must pass an acceptance test consisting in dimensional check, leak test in vacuum and electrical insulation checks including test in Paschen conditions before being shipped to the Supplier premises.
Once arrived at the Supplier premises the WP, after the needed acceptance test, will be cold tested.
After the cold test at the Supplier premises, the WP is inserted into the Coil Structure to complete the TF coil. The fiducial points will be then transferred to the coil cases surfaces in order to have measurable points during the TF coil final assembly into the ITER machine.
To allow insertion of the WP during TFC manufacturing, the TFCC is split into four main subassemblies (AU, BU, AP, and BP).
In addition to these four main sub-assemblies there are a number of associated parts that allow the individual TF coils to be joined. These are as follows:
— one set of inner leg inter coil structure (ILIS) components. These flat G10 panels will be mounted on both sides of sub-assembly AU after closure welding of each TFC, to provide the proper fit and low voltage insulation between the inner legs of the TFC,
— three pairs of sets of inter-coil components used to connect the IS of the TFC together, namely:
—— the upper and lower IIS components (cylindrical shear keys, connecting the integral IIS),
—— the upper and lower OIS components (clamping bolts and combined shear pins/clamping bolts, connecting the integral OIS),
—— the upper and lower IOIS components (connecting plates and shear pins, connecting the integral IOIS).
There are 7 type of the TF coil. Actually the 18 TFC installed in the ITER machine have identical WP but the TFCC attachments and interfaces required to support the CS, PFC and CC cannot be identical for all TFC.

Plazo
El plazo para la recepción de ofertas era de 2012-10-29. La contratación se publicó en 2012-08-10.

Proveedores
Los siguientes proveedores se mencionan en decisiones de adjudicación u otros documentos de contratación:

• • SIMIC S.p.A
• • Simic S.p.A.

¿A quién?

• • The European Joint Undertaking for ITER and the Development of Fusion Energy ("Fusion for Energy")

¿Cómo?

• • Equipo y aparatos eléctricos › Imanes