Nuclear power is back at the top of the political agenda.The UK relies on atomic energy for nearly 20% of its electricity. But all but one of its existing power stations are due to close by 2023.No reactors have been built since the 1980s, as accidents, spiralling decommissioning costs and the problem of nuclear waste eroded enthusiasm.But with soaring oil and gas prices, dwindling fossil fuel reserves and pressure to tackle climate change, the government has renewed its support for nuclear power.It is backing a new generation of atomic power stations because it believes they provide the necessary security of supply while helping reduce carbon emissions.Click through this guide to find out more about nuclear power in the UK.