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

  • Assembly | Set of handling tools for in-vessel installation finalized

    Inside of a test facility that reproduces the volume and geometry of the ITER vacuum vessel environment, a team from CNIM Systèmes Industriels has dem [...]

    Read more

  • 360° image of the week | The assembly theatre

    Ever since it was invented almost two centuries ago, photography has tried to capture what the human eye actually sees. Despite huge progress achieved, it has n [...]

    Read more

  • Science | Favourable impurity dynamics in ITER confirmed by experiment

    Recent studies at the JET tokamak confirm the physics basis for tungsten transport at the edge of fusion-producing plasmas in ITER and the project's strategy fo [...]

    Read more

  • Image of the week | 15th D-shaped coil delivered

    Fifteen out of ITER's 19 D-shaped toroidal field coils have been delivered. Toroidal field coils are among the largest and heaviest components of the ITER machi [...]

    Read more

  • Spinoffs | Japan develops first high-output, multi-frequency gyrotron

    Building off expertise developed in the supply of high-power, high-frequency gyrotrons for the ITER Project and the JT-60SA tokamak, Japan's National Insti [...]

    Read more

Of Interest

See archived entries

Blanket manifold system flows through its final design review

On the second day of the review, participants were able to visit mockups of the blanket manifold design (Click to view larger version...)
On the second day of the review, participants were able to visit mockups of the blanket manifold design
The final design review of the ITER blanket manifolds was held on 9-10 December, with more than 30 participants from the ITER Organization Central Team, the European Domestic Agency, contracting organizations, and invited external subject matter experts.

The blanket manifold system feeds cooling water to the different blanket modules through pipes arranged in bundles and routed mostly through the upper ports of the vacuum vessel. With a total flow rate of 3 120 kg/s—or the average flow rate of a small river—the blanket manifold system removes up to 736 MW of thermal power through 6.5 km (45 tonnes) of piping.

"The development and validation of the final design is a major achievement as the blanket manifolds are planned for installation during the first phase of machine assembly, before First Plasma," says Rene Raffray, who leads the Blanket Integrated Product Team and the Blanket Section. "We are designing and manufacturing the first blanket manifolds to operate in a fusion reactor environment."

Traditionally a manifold system can be described as a fairly conventional assembly of pipes. Due to the demanding operating conditions and constraints of ITER, however, the design of the blanket manifold system was particularly challenging. For example, the attachment features between the pipes and the vacuum vessel supports need to be electrically insulated in order to maintain electromagnetic forces during plasma disruptions at acceptable levels. At the same time, these features need to be thermally conducting so that the nuclear heat generated in the supports is transferred to the pipes and not to the vacuum vessel where it might cause unacceptable thermal stresses.

The review panel confirmed the soundness of the design and congratulated the manifold team, with contributions from the ITER Organization Central Team, the European Domestic Agency and contracting organizations. (Click to view larger version...)
The review panel confirmed the soundness of the design and congratulated the manifold team, with contributions from the ITER Organization Central Team, the European Domestic Agency and contracting organizations.
The blanket manifold design makes use of a ceramic insulating layer configuration (alumina being the preferred option) to meet these constraints.

Other design challenges are linked to the need to achieve tight assembly tolerances (on the order of 1 mm) for a component measuring 6 to 7 metres. An extensive validation program has been performed on mockups to demonstrate that these tolerances can be met; another program is underway to validate the support design.

In assessing the work presented at the final design review Brad Nelson, chief engineer at the US ITER Project Office and chair of the review panel, confirmed the suitability of the design and thanked the manifold team for the high level of preparation, clear presentations and thorough documentation. During the debriefing, one panel member added: "Ownership and competence in the design team is evident."

The focus will now be on final touches to the design based on the panel feedback and preparation for the Blanket Manifold Procurement Arrangement with the European Domestic Agency planned for signature in 2016.


return to the latest published articles