Guardian: Barack Obama’s new dream of a nuclear renaissance faces a major reality check tomorrow when the state of Vermont is expected to shut down an ageing nuclear reactor with a history of leaks. It would be the first time a state has moved to shut down such a reactor, and follows Obama’s announcement last week of $8.3bn (£5.4bn) in loan guarantees for the construction of two new reactors in Georgia. White House officials said the money would help spur a burst of new construction – the first …