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The Tokamak complex building construction is progressing on the ITER site. This consists of the Tokamak building hosting the machine, the Tritium building and the Diagnostic building, together with a wide range of auxiliary buildings, such as those for the heating systems, cryoplant, power supply, or the assembly of the Tokamak machine. The ITER project applies a staged approach, with the first plasma phase scheduled end of 2025, followed by the Prefusion power operation phase I and II, and finally the Tritium phase scheduled in 2035. As a consequence of the staged approach, the schedule of the building construction and plant systems installation has to be organized accordingly, and the plant configuration for each phase has to be defined. While the manufacture of the long lead items for the Tokamak machine is currently ongoing, the plant systems are completing the final design and manufacturing design, in order to start the manufacture of the components to be ready on time for the start of the installation works in the buildings. This paper gives an overview of the building overall integration and design process, and the construction status of each building. This paper further highlights the definition freeze and control of the physical and functional interfaces which are needed, in order to decouple the plant systems design and reducing the risk of possible changes propagated to the more advanced and mature interfacing systems. The newly introduced staged approach is described with the requirements on the four plasma phases. [ABSTRACT FROM AUTHOR]

The ITER project consists of a wide range of complex systems and interfaces which needs to be configured and controlled over the lifetime of the project with a comprehensive configuration management in place. The different maturities of the systems and their schedule need to be integrated in the overall project schedule in order to allow the project to stay in planned cost and schedule. The interfaces have to be advanced for those systems that are still in conceptual design phase to have sufficient information to advance with the systems facing the manufacturing readiness review (MRR). In order to achieve the project objectives, the structure of the ITER Organization (IO) Central Team (CT) is being adapted toward the ongoing construction phase on site as well as in the domestic agencies (DA) with a streamlined organization. Area manager posts have been created for all buildings, the site and the tokamak machine in order to have a prompt decision-making in design and construction phase following project change requests, system deviation requests, and field change requests. Weekly meetings are held between the IO CT with the DA and their contractors to feed the proposed modifications in the project baseline documentation including the associated cost and schedule impact. In parallel the project is preparing the installation phase of the machine and the plant systems layout in identifying the systems required for the first plasma, but also those which are "captive" and need to be installed during the civil works of the building. The schedule for each building and level has been developed to review the required duration and manpower in each area. As the installation of the systems and components will start at the defined ready for equipment dates for each areas and levels, the co-activities among the contractors have to be agreed. [ABSTRACT FROM AUTHOR]

Abstract: The ITER site consists of almost 30 buildings to service the Tokamak machine which is located in the centre of the Tokamak Complex facility with the Tokamak-, Diagnostic- and Tritium building. The design of a large part of the ITER plant systems will be executed by the ITER Domestic Agencies or their industrial suppliers under functional specifications provided by the ITER Organization. At the same time, the detailed design of the building is carried out by the European Domestic Agency ‘Fusion for Energy’ (F4E). In order to allow an efficient identification of the ITER configuration as well as to manage the concurrent engineering activities and to simplify the identification and assessment of changes, the design of each ITER plant systems is described in the so-called Configuration Management Models (CMM). These are light CATIA® 3D models that define the required space envelope and the physical interfaces in-between the systems and the buildings. The paper describes the procedure adopted for the control of the baseline configuration of the Tokamak Complex facility and Auxiliary Buildings with their associated plant systems and illustrates the current status as well as recent developments in the different systems. [Copyright &y& Elsevier]