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Bâtiment PF Atelier Cryostat Le Siège d'ITER Fosse du Tokamak Fondations du Tokamak Bâtiment d'Assemblage Bâtiment et emprise Assemblage de la machine Métrologie optique Des outils dédiés | |||
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  Divertor Vertical Target Qualification Prototype manufactured by the EU Domestic Agency.  TSEFEY-M Electron Beam Test Facility (RF Domestic Agency). The divertor design needs to provide an engineering solution compatible with today's plasma physics expectations; but, given the uncertainties in extrapolating the future progress in plasma physics, and thus in component durability, the design also needs to provide the highest flexibility in terms of possible modifications of the PFC configuration and ways for rapid replacement and refurbishment. The divertor consists of 54 cassettes (six per vacuum vessel sector) that are inserted radially through three lower level ports and moved toroidally before being locked into position. The cassette body is reusable and designed to provide neutron shielding for the vessel and to provide a mechanical support for the PFCs and a variety of diagnostics. The divertor PFCs, together with the Toroidal Field Magnet Conductors and the blanket modules, require a qualification of the Party prior to the start of the procurement. This means that each party allocated one of these critical procurement packages must first "qualify" by demonstrating its technical capability to carry out the procurement with the required quality, and in an efficient and timely manner. This is achieved via the successful manufacturing and testing of medium-size "Qualification Prototypes" (QPs). After manufacturing is completed, the divertor QPs, which include all the most technically challenging features of the corresponding ITER divertor design, will be subject to performance tests in the TSEFEY-M electron beam facility at the Efremov Institute, Saint Petersburg, Russia, to assess their heat flux load- carrying capability. The European, Russian and Japanese Domestic Agencies (DAs) are involved in this qualification programme, which was first presented to them by the ITER Organization (IO) at the "ITER Divertor Meeting" held in Genova, Italy on 26-28 October 2005. Extensive technical and administrative negotiations followed, which culminated with the approval of the "Memorandum of Understanding on the Procurement of the ITER Divertor" at the so-called "Participating Team Leaders' Meeting" of July 2006. This document, together with the "ITER Divertor Procurement Plan", which was agreed at technical level and explicitly recalled in the Memorandum of Understanding, paved the way for the preparation of the detailed technical specification as well as the acceptance criteria of the QPs. This preparatory work was then formalized in Qualification Task Agreements, which were signed by the IO and the DAs concerned during the first half of 2007. Each DA has to deliver at least two QPs by mid-2008. The protocol for the performance tests was formalized in a High Heat Flux Testing Task Agreement between IO and the RF DA, which was signed on 14 June 2007. More recently, on 12 June 2008, a Custom Agreement on temporary admission to Russia of the QPs was signed to ensure a smooth import and export of the components from the EU and JA DAs to the RF territory. The performance tests are due to be completed by the end of 2008, thus allowing the finalization of the three Procurement Arrangements 17P2A, 17P2B and 17P2C on the divertor PFCs by February 2009, a date which has remained unchanged since it was first proposed to the DAs in mid-2005. << return to Newsline #38 |
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