Subscribe options

Select your newsletters:


Please enter your email address:

@

News & Media

Latest ITER Newsline

  • Making remote handling less remote

    Over a wet and windy three-day period on the ITER site in November, around 90 representatives of the ITER Organization, the Domestic Agencies of Europe and Japa [...]

    Read more

  • The framework for sharing ITER intellectual property

    In signing the ITER Agreement in 2006, the seven ITER Members were agreeing not only to share in the costs of constructing and operating the ITER facility, but [...]

    Read more

  • Wendelstein achieves ultra-precise magnetic topology

    A recent article in the online journal Nature Communications confirms that the complex topology of the magnetic field of Wendelstein 7-X—the world's largest ste [...]

    Read more

  • The Matrix, rigid and fluid

    A fast-growing array of structures and buildings has been emerging across the ITER worksite platform under the control and supervision of the European Domestic [...]

    Read more

  • By road, river and sea

    They travelled by road from the Air Liquide factory near Grenoble, sailed down the Rhône River from Lyon and entered the Mediterranean to the east of Fos-sur-Me [...]

    Read more

Of Interest

See archived articles

Bringing it all together for DEMO

-Nick Holloway, Culham Centre for Fusion Energy

Experts at Culham Centre for Fusion Energy (CCFE) have carried out the first-ever integrated assessment of the life expectancy of materials in a full-scale fusion power plant design.

The study focused on the effects caused by the build-up of helium in fusion materials. When neutrons from fusion reactions hit the materials in reactor components, they trigger nuclear reactions that cause transmutation (the changing of elements to form new ones). Helium is one of the gases produced by such reactions. The accumulation of helium causes swelling and embrittlement of materials—leading to fracture—and is one of the factors expected to limit the lifetime of components in a fusion power plant.

Materials modellers Mark Gilbert and Sergei Dudarev, working with CCFE specialists in nuclear data and neutron transport (Lee Packer, Jean-Christophe Sublet, and Shanliang Zheng) have conducted a pioneering study in which a fusion power plant design was explored and assessed using an integrated computational model that gives a detailed prediction of the lifetime of components under helium embrittlement.

An artist's impression based on European fusion power plant design. © EFDA (Click to view larger version...)
An artist's impression based on European fusion power plant design. © EFDA
The results will help guide the choice of materials for the design of DEMO, the prototype power plant that will follow the ITER experiment.

"We found wide variations between the behaviour of different materials," said Mark Gilbert. "The good news is that tungsten (the likely material for the 'divertor' plasma exhaust system in DEMO as well as ITER) shows low susceptibility to helium accumulation and embrittlement. However, in the iron of steels, for example, there is higher helium production in components bearing the brunt of neutrons from fusion reactions. The study highlights the need to develop materials with special microstructure, such as oxide dispersion strengthened steels that can resist the effects of helium accumulation without becoming brittle."

"We think the integrated approach we have adopted has worked well, and it will now help advance the EFDA materials program as a result."

The results of the work are published in Nuclear Fusion 52 (2012) 083019.


return to the latest published articles