Wednesday, February 15, 2012

US to resume building nuclear plants




NewScientist - For the first time since 1978, the United States has approved the construction of nuclear reactors. While the decision could herald a new dawn for nuclear power there, the major growth in the sector is likely to be elsewhere.

The nuclear industry had been expecting a renaissance in the next few years, until a major setback occurred – last year’s Fukushima Daiichi disaster in Japan. In the aftermath, Japan closed most of its reactors for safety tests, Germany announced it was abandoning nuclear and other countries elected to review their plans.

The situation may now be changing. On 9 February the US Nuclear Regulatory Commission issued a licence for Southern Company, an energy utility based in Atlanta, Georgia, to build a pair of reactors at its Vogtle site. No new reactors have been built in the US since before the Three Mile Island accident in Pennsylvania in 1979.

The Georgia plant will probably soon be followed by a second pair of reactors which the South Carolina Electric and Gas Company wants to build at its VC Summer Nuclear Station in Jenkinsville, subject to licences being granted. The Florida Power & Light Company also hopes to build two new reactors.

Passive safety system

The Fukushima plant overheated when last year’s tsunami flooded the engines that powered its cooling pumps. By contrast the Georgia site, along with the other two US sites awaiting approval, will use new AP1000 reactors, built by Westinghouse. These are fitted with passive safety systems that need no power – for instance, a rooftop water tank that can keep the reactor cool for 72 hours.        More