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Latest ITER Newsline

  • Port cells | All 46 doors in place

    In ITER, ordinary objects and features often take on an awesome dimension. Take the doors that seal off the port cells around the Tokamak for instance. Doors th [...]

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  • Toroidal field coils | Two make a pair

    One of the essential 'building blocks' of the ITER Tokamak is the pre-assembly of two toroidal field coils, one vacuum vessel sector and corresponding panels of [...]

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  • Industrial milestone | Cryostat manufacturing comes to an end in India

    With a flag-off ceremony on 30 June, India's L&T Heavy Engineering marked the end of an eight-year industrial adventure—the manufacturing of the ITER cryost [...]

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  • Local partners | A celebration for ITER's "vital artery"

    ITER is made possible through the work of thousands of scientists, engineers, workers of all trades and industries across the globe. It is also made possible by [...]

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  • Photo reportage | Travelling with a coil

    From the salt marshes of the inland sea Étang-de-Berre to the rolling hills around the ITER site (with a view of some of the highest alpine summits) an ITER con [...]

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Of Interest

See archived entries

4D planning for assembly

3D plus time

K.D.

ITER construction planners and coordinators are using 4D planning methods to prepare for activities performed on critical machine components in the congested environment of the ITER Assembly Hall.

4D visualizations capture both the temporal and spatial aspects of the assembly schedule, allowing planners to organize co-activity and identify potential clashes. (Animation of the cryostat base lift by Brigantium Engineering.) (Click to view larger version...)
4D visualizations capture both the temporal and spatial aspects of the assembly schedule, allowing planners to organize co-activity and identify potential clashes. (Animation of the cryostat base lift by Brigantium Engineering.)
All large machine components will transit through the ITER Assembly Hall—entering through double doors on the south end, pausing at a laydown area for preparation or pre-assembly, and ultimately traversing the length of the building on the cables of the overhead bridge cranes for installation inside the Tokamak pit.

"In the months and years ahead, some of the largest machine components will be going through the Assembly Hall," says Brian Macklin, who leads the Construction Department's Ex-Vessel Assembly Group. "Planning for the routing of a component through the Assembly Building is not just a matter of bringing it from point A to point B—we must also take into account other components arriving at the same time, the availability of the overhead cranes, space constraints in the Assembly Hall, and other activities inside the building."

Avoiding bottlenecks requires the integration of detailed schedule information for each work package—what is arriving when, and what preparation or pre-assembly activities must be carried out in the Assembly Hall—with 3D models of the relevant components, tooling and assembly spaces.

Click to view the video...
"4D scheduling is the result of merging 3D data with scheduling data," says Lynton Sutton, who is the contractor doing the 4D planning for Macklin's group through his company Brigantium Engineering. "Using 4D planning, we are able to optimize and validate the coordination planning of different work packages and the use of space; we have also used 4D to model different scenarios to aide in decision-making. 4D has been a vital tool for construction sequence visualization—enabling us to identify critical risks and clashes that may have been difficult to spot using traditional planning method alone. In addition, we are able to create video animations using 4D, which are valuable tools for communication."

Having accurate, up-to-date, configuration-controlled input is critical. Sutton has developed an internal process for accessing validated CAD models from the ITER Organization Design Office and associated schedule data from the workface planners of the MOMENTUM consortium—the Construction Management-as-Agent responsible for the day-to-day planning of ITER assembly.  

The group used 4D to model the recent cryostat base installation operation (click on the animation above), and is currently working on scenarios for the next large components to enter the Assembly Hall—the cryostat lower cylinder, the lower cryostat thermal shield, and vacuum vessel Sector #6.

"4D planning allows us to display complex sequences in a visual form that is immediately understandable by all," says Macklin. "It's hard to overstate how powerful this tool can be for avoiding clashes and rework, and for bringing all teams to the same understanding of a space allocation or sequencing problem, leading to faster resolution."


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