Subscribe options

Select your newsletters:

Please enter your email address:

@

Your email address will only be used for the purpose of sending you the ITER Organization publication(s) that you have requested. ITER Organization will not transfer your email address or other personal data to any other party or use it for commercial purposes.

If you change your mind, you can easily unsubscribe by clicking the unsubscribe option at the bottom of an email you've received from ITER Organization.

For more information, see our Privacy policy.

News & Media

Latest ITER Newsline

  • Top management | Tim Luce, Head of Science & Operation

    What does a seven-year-old growing up in a small community in Arkansas know about what it means to be an 'atomic scientist'? Probably not much. Except, remember [...]

    Read more

  • Blanket shield blocks | Series production milestone in Korea

    It takes many months for a single forged block of stainless steel to be transformed into the complex shape of an ITER blanket shield block, full of gullies, cha [...]

    Read more

  • Image of the week | 5 top lid segments expected

    A little less than five years ago, in December 2015, the first segments of the ITER cryostat (out of a total of 54) were delivered to the construction site from [...]

    Read more

  • On site | As ITER begins assembly, HVAC becomes mission critical

    Not only will heating, ventilation and air conditioning (HVAC) help protect people and equipment during the assembly phase at ITER, but they will also help ensu [...]

    Read more

  • Vacuum vessel | Sector #6 is leak tight

    The first ITER vacuum vessel sector has passed a helium leak test on site with flying colours. Back in March 2020, as experts from the Korean Domestic Agency [...]

    Read more

Of Interest

See archived entries

Vacuum vessel

India completes in-wall shielding package

The Indian Domestic Agency has completed the procurement of about 9,000 in-wall shielding blocks and accompanying support ribs, brackets and fasteners. The majority of these elements have been delivered to the contractors manufacturing the ITER vacuum vessel in Europe and Korea.

In-wall shielding plates—assembled into blocks—will fill 55% of the space between the double walls of the vacuum vessel. Their role? To shield components outside the vacuum vessel from the neutrons generated by the fusion reaction and contribute to the confinement of the plasma's fast particles. The large number of variants was one of the challenges in manufacturing. (Click to view larger version...)
In-wall shielding plates—assembled into blocks—will fill 55% of the space between the double walls of the vacuum vessel. Their role? To shield components outside the vacuum vessel from the neutrons generated by the fusion reaction and contribute to the confinement of the plasma's fast particles. The large number of variants was one of the challenges in manufacturing.
In the space between the inner and outer shells of the ITER vacuum vessel are tightly sandwiched stacks of borated or ferromagnetic steel blocks that serve a double purpose: shielding components outside of the vessel from fusion neutrons and helping to optimize plasma performance by reducing toroidal field ripple.

The Indian Domestic Agency has been in charge of the procurement and delivery of approximately 9,000 shielding blocks, mainly for installation into the vacuum vessel sectors during the fabrication process in Korea and Europe. (About 10 percent of the blocks will be delivered to ITER for installation in the field joint regions when the vacuum vessel sectors are assembled in the Tokamak pit.) The weight of each neutron shielding plate can vary between 50 and 500 kg depending on its shape and location.

Manufacturing, which was carried out at M/s Avasarala Technologies Limited (ATL), Bengaluru, and Larsen & Toubro (L&T), Surat, required various industrial processes like water jet cutting, precision machining, assembly with tight tolerances, accurate dimensional measurements, spot welding, full penetration welding, and non-destructive testing.

"The design, manufacturing, and installation were challenging because of the variety of design configurations and the tight tolerance requirements," explains Chang Ho Choi, head of the Sector Modules Delivery & Assembly Division at ITER and leader of the Vacuum Vessel Project Team. "Thanks to very constructive collaboration between the Domestic Agencies of India, Europe, and Korea and their industries, we have overcome the challenges. Almost 50 percent of the installation of in-wall shielding into the sectors has been completed and the first factory and site acceptance tests (on sector #6) have demonstrated that the quality of the in-wall shielding is quite good."

Read a full report on the ITER India website.


return to the latest published articles