Subscribe options

Select your newsletters:

Please enter your email address:

@

News & Media

Latest ITER Newsline

  • Technology | The many wonders of ITER diagnostics

    The eyes and ears of virtually all plant functions, ITER diagnostic sensors and accompanying systems will play an essential role at ITER. They will keep the rea [...]

    Read more

  • Outreach | Industry really can be "extraordinaire"

    'Great things are done by a series of small things brought together.' This quote, attributed to the Dutch painter Vincent Van Gogh, could have been the perfect [...]

    Read more

  • Tokamak Building | Civil works completed

    The olive tree that stood for a few days at the top of the Tokamak Building marked the completion of a five-year effort by Europe and its main contractor VFR to [...]

    Read more

  • Assembly Hall | Another massive handling tool

    Inside of the Assembly Hall, some of ITER's heaviest components will have to be raised ever so carefully from their horizontal delivery positions to vertical. T [...]

    Read more

  • Image of the week | Time to celebrate

    It is traditional, in the world of construction, to celebrate the completion of a house or building by placing a leafy branch on its roof or topmost beam. The p [...]

    Read more

Of Interest

See archived entries

The 'frame' is ready, welding can begin

It is no news that the ITER Tokamak will be large ... very large. But "large" can remain an abstraction until you are given the chance to see some of the equipment and tools that will be implemented in its construction.

Another two steel frames will be necessary to support components, jigs and fixtures during the cryostat assembly process. The circular assembly platforms (34 metres in diameter) will also act as transporters for the completed cryostat sections. (Click to view larger version...)
Another two steel frames will be necessary to support components, jigs and fixtures during the cryostat assembly process. The circular assembly platforms (34 metres in diameter) will also act as transporters for the completed cryostat sections.
One of these pieces of equipment has just been assembled in the Cryostat Workshop—a circular steel frame that will support the cryostat base segments during welding operations.

The frame's diameter is 34 metres—four metres more than that of the cryostat in order to provide sufficient room for workers and welding machines. In the 44-metre wide Cryostat Workshop, the presence of such a large steel structure is overwhelming. Its sheer size dwarfs the men who were responsible for its assembly.

"We'll position the 60° segments of tier 1 on the frame and then align them using laser metrology," explains Vaibhav Joshi of ITER India. "Once tier 1 is welded, we will do the same with the 'rim' (tier 2). Welding operations will begin at the end of this month and last for about a year and a half, until the end of 2017."

The cryostat segments, manufactured by Larsen & Toubro Ltd, are part of India's in-kind procurement contributions. Indian contractor MAN Diesel & Turbo (Germany) will be in charge of welding operations. Once completed, the cryostat base section will weigh 1,250 tonnes ─ the single largest load of the machine assembly.

Still resting on its support frame, the base section will travel out of the workshop and into temporary storage on a self-propelled transport vehicle (SPMT).

Cryostat pre-assembly operations will then progress for the next sections (lower and upper cylinders) on two new frames. Once the base section is installed in its permanent position in the Tokamak Pit, its frame will be re-used for the final piece of the cryostat—the top lid.


return to the latest published articles