China has never experienced a major nuclear accident, although there have been small leaks of radiation from some of its nuclear power stations. The last occurred in May 2010 in Shenzhen in southern China's Guangdong Province at the Daya Bay plant, the oldest of China's 13 operational nuclear reactors. Managers at the plant failed to inform the public of the leak until three weeks later. Subsequently, Beijing denied that radiation had escaped but it was confirmed by a Hong Kong power company with a share in Daya Bay.