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  • FEC2020 | Seeking sponsors for 28th IAEA Fusion Energy Conference

    For only the third time since 1961, the International Atomic Energy Agency's Fusion Energy Conference will be taking place in France—hosted jointly by the Frenc [...]

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  • Nuclear safety | Under constant scrutiny

    Because one of the elements involved in the fusion reaction is the radioactive isotope tritium, and because the hydrogen fusion reaction itself generates a high [...]

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  • Power conversion | Alien structures and strange contraptions

    There are places in ITER that seem to belong to another world, places full of alien structures and strange contraptions. The feeling—a mixture of awe and puzzle [...]

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  • Tokamak Complex | A changing landscape

    For the past three years, the view from the top of the highest worksite crane has not changed much. Inside of the Tokamak Complex, 80 metres below, concrete gal [...]

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  • Ion cyclotron heating | How to pump 20 MW of power into 1 gram of plasma

    To power the ion cyclotron system, the ITER Organization and its partners are designing not only new antennas, which will be housed in the tokamak vessel, but a [...]

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Of Interest

See archived entries

Tokamak building

The undressing of the bioshield

R.A.

More than two years ago in October 2015, concrete pouring began for one of the most striking structures of the entire construction site: the ITER bioshield, a massive cylindrical fortress that surrounds the machine and protects workers and the environment from the radiation generated by fusion reactions.

The massive structure of the bioshield—an emblem of the ITER Project—is now bare and its revealed anatomy helps us to better understand its function. (Click to view larger version...)
The massive structure of the bioshield—an emblem of the ITER Project—is now bare and its revealed anatomy helps us to better understand its function.
As construction progressed, the nest-like structure became the defining feature of Tokamak Complex construction and an icon for the project as a whole. Pictures of the bioshield—taken from above in the slanted late evening light by drone or from a crane—have been a favourite of the media for the past two years.

Until last week, however, what was visible of the bioshield was mostly ... the formwork that surrounded it—white and red moulds, scaffolding and platforms pressing against grey concrete and brown rebar.

As formwork was removed from the bioshield proper, new moulds and scaffolding were being erected on the north side of the structure. They are for the reinforced wall that will support the 10-metre-high ''vault'' that will accommodate equipment for the Tokamak's cooling water system (TCWS). (Click to view larger version...)
As formwork was removed from the bioshield proper, new moulds and scaffolding were being erected on the north side of the structure. They are for the reinforced wall that will support the 10-metre-high ''vault'' that will accommodate equipment for the Tokamak's cooling water system (TCWS).
Now, the bioshield is fully formed and this equipment is not needed anymore. The structure is bare and its anatomy, now revealed, helps us better understand its function—how, for instance, penetrations of all sizes and shapes will allow neutral beam injectors, diagnostic systems and remote handling machinery to reach the heart of the machine.

Covered or naked, the fortress remains imposing—a renewed emblem for a unique project.


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