This week the project gained final approval for the design of the most technically challenging component – the fusion reactor’s “blanket” that will handle the super-heated nuclear fuel. The building site in Cadarache has also passed the crucial stage where some 493 seismic bearings – giant concrete and rubber plinths – have been set into the reactor’s deep foundations to protect against possible earthquakes. Peering over the edge of the huge seismic isolation pit, it is still possible to see some of these bearings before they are covered with a raft of reinforced concrete that will support the massive fusion machine at the heart of the £13bn Iter project. Over the next few years about a million individual components of the highly complex fusion reactor will arrive at the Cadarache site from around the world. They will be assembled like a giant Lego model in a nearby building which has a volume equal to 81 Olympic-sized swimming pools. Nothing is left to chance in a project that has defied potential Babel-like misunderstandings between the collaborating nations. The design, development and construction of a machine that will attempt to emulate the nuclear fusion reactions of the Sun is proving to be a triumph of diplomacy, as well as science and engineering. “It is the largest scientific collaboration in the world. In fact, the project is so complex we even had to invent our own currency – known as the Iter Unit of Account – to decide how each country pays its share,” says Carlos Alejaldre, Iter’s deputy director responsible for safety. “We’ve passed from the design stage to being a construction project. We will have to show it is safe. If we cannot convince the public that this is safe, I don’t think nuclear fusion will be developed anywhere in the world,” Dr Alejaldre said. “A Fukushima-like accident is impossible at Iter because the fusion reaction is fundamentally safe. Any disturbance from ideal conditions and the reaction will stop. A runaway nuclear reaction and a core meltdown are simply not possible,” he said. independent.co.uk/news/science/one-giant-leap-for-mankind-13bn-iter-project-makes-breakthrough-in-the-quest-for-nuclear-fusion-a-solution-to-climate-change-and-an-age-of-clean-cheap-energy-8590480.html
Posted on: Fri, 12 Jul 2013 18:03:16 +0000
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