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In the Tokamak Complex (pictured) and across the construction platform, teams are installing the systems that will support machine operation. (Click to view larger version...)
In the Tokamak Complex (pictured) and across the construction platform, teams are installing the systems that will support machine operation.
Everything outside of the Tokamak boundary falls into the category of "plant assembly"—including the installation of equipment and systems inside of the Tokamak Complex as well as the more standard plant installation works in buildings across the ITER platform.

First-phase plant assembly contracts cover the systems needed for First Plasma. These include the cryogenic, cooling water and electrical plants; basic diagnostics; some electron cyclotron heating, as well as large captive components in buildings.

For the most complex and time-sensitive area—the Tokamak Complex—the choice has been made to split the works between two contractors, and to organize the division of scope by system, location and sequence (see BOX). Although the two assembly contractors for the Tokamak Complex work in distinct areas, their work scope contains many common elements:

Mechanical and piping works: vessels, piping systems, tubing; heat exchangers, pumps, motors; metal structures; cable trays and cable pulling; wave guides; piping thermal installation; pressure tests, flushing

Tokamak Complex (organized by system, location, sequence)

TCC/1 - heating and current drive, diagnostics, fuelling, secondary cooling, vacuum components. Contract award pending
TCC/2 - primary machine cooling water, test blanket module equipment, some vacuum pipework, vacuum vessel pressure suppression. Contract award pending

Balance of Plant
Group 1 - equipment installation in the Magnet Power Conversion buildings
Group 2 - installation of cooling water plant
Group 4 - installation of multi-process lines
Group 5 - installation of DC busbars, switching network and fast discharge units
Group 6 - installation of converters, transformers, reactive power compensation units, and harmonic filters

Electrical and instrumentation and control (I&C) works:
DC busbars; switching equipment; low and medium voltage power cables; I&C cables and cabinets; cable trays and conduits; power distribution cabinets

Co-activity in the Tokamak Complex will be a challenge to manage, as ITER Organization assembly contractors work inside of congested areas alongside the European Domestic Agency contractors who are finishing the installation of building services such as HVAC, fire protection and electrical services. Also challenging are the installation tolerances, the large number of components (estimated above 10 million*) and the tight schedule.

The installation of piping has begun in the basement galleries of the Tokamak Complex that have been handed over as completed by the European Domestic Agency. Early work is also underway in plant buildings across the ITER platform that have reached "ready for equipment" milestones such as the cryoplant, the heat rejection zone, the Site Services Building, and the twin buildings for magnet power conversion.

*Ten percent of these 10 million components are part of the ITER Tokamak itself; the others are part of the plant.

More photos are available in the galleries for the cryoplant and the heat rejection system.

Plant Assembly Facts:

Number of overall components (estimated): 10 million (including 1 million Tokamak components)
Assembly of the First Plasma plant: September 2018-December 2024
Engineering work packages for plant assembly: xxxx
Cables laid before First Plasma: 5,000 km (double by Fusion Power Operation)
...