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The European ITER Test Blanket Modules: Assessment of manufacturing technologies for HCLL

Abstract : The HCLL-TBM (Helium Cooled Lithium Lead Test Blanket Module) is one of the two European TBMs chosen to be tested in ITER. HCLL TBM structure is constituted by a box, made of two Side Caps (SCs) and a First Wall (FW), stiffened by horizontal and vertical Stiffening Plates (SP) and closed on its back by several back plates (BPs). All structure subcomponents are internally cooled by Helium circulating in meandering squared section channels. This paper describes manufacturing technologies developed and implemented to assembly the SPs into the box. It presents the preliminary manufacturing procedure developed and applied for the assembly of the SPs into the box by Tungsten Inert Gas (TIG). Several mock ups have been manufactured from laboratory to feasibility mock ups (scale 1:1) on which non-destructive and destructive tests have been carried-out to identify the preliminary manufacturing procedure. Due to TBM specificities (namely complex welding trajectories, heavy and big components, plates with channels, space constraints, ...) a specific welding facility including a custom welding torch and an automated bench has been achieved and is also described in the paper. We detail the adopted manufacturing strategies, as the optimization of welding sequence to minimize distortions and the customization of welding parameters, to compensate machining tolerances and welding gaps. Results such as welded joints quality and microstructure, internal cooling channel deformation and structure distortions are reported. These developments have been performed following a standardized procedure complying with professional codes and standards (RCC-MRx).
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L. Forest, J. Tosi, A. Li Puma, O. Doyen, N. Thomas, et al.. The European ITER Test Blanket Modules: Assessment of manufacturing technologies for HCLL. ISFNT-13, Sep 2017, Kyoto, Japan. ⟨cea-02434528⟩

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