F4E-OPE-1165 - Supply of JT-60SA NHF Elements

Within the framework of the BA, F4E must supply the actively-cooled divertor of JT-60SA (hereafter referred to as the “divertor”). This divertor consists of 36 almost identical units and is located at the bottom of the vacuum vessel of JT-60SA (Figure 1). Each divertor unit has vertical targets, dome, baffles and cover plates, all installed on a stainless steel cassette. The targets, dome, baffles and target plates are collectively referred to as Plasma Facing Components (PFCs). The PFCs are exposed to the heat flux from the plasma, which is then transferred to the cooling water flowing in pipes running underneath their surface. The target supports are simple fabricated stainless steel structures, made of plates, pipes, manifolds. They are used to connect the NHF elements to the divertor cassette frames. The vertical target supports (see Figure 2 - Figure 5) are so divided:  inner target supports  inner target manifolds  inner target branch pipe sets  outer target supports  outer target manifolds  outer target branch pipe sets  fasteners Each of them consist of a support structure, made of welded stainless steel plates, one or two manifolds with associated branch pipes, and loose branch pipes, which will be used to connect them to the NHF elements at a later stage (out of the scope of this contract). The support structure has to be fully fabricated (welded, NDE, machined) as well as the manifolds with the main pipes and principal branch pipes. The loose branch pipes have to be fabricated and bent to shape. The exact breakdown of each vertical target support is given in the drawings and models associated with this specification.