Fukushima Reactor 4 poses massive global risk 19 May 2012 The troubled Reactor 4 at the Fukushima Daiichi nuclear plant is at the centre of a potential catastrophe. Reactor 4 — and to a lesser extent Reactor 3 — still hold large quantities of cooling waters surrounding spent nuclear fuel, all bound by a fragile concrete pool located 30 metres above the ground, and exposed to the elements. A magnitude 7 or 7.5 earthquake would likely fracture that pool, and disaster would ensue, says Arnie Gundersen, a nuclear engineer with Fairewinds Energy Education who has visited the site. The 1,535 spent fuel rods would become exposed to the air and would likely catch fire, with the most-recently added fuel rods igniting first.
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