Copeland and Allerdale have been earmarked as potential sites to store high-level radioactive waste.

BBC: Cumbria councils defer nuclear waste storage search

Britain needs to find a site for the long-term underground disposal of high-level radioactive waste.

BBC: Schematic of repository

Britain needs to find a site for the long-term underground disposal of high-level radioactive waste as some if it stays dangerous for 100, 000 years.

BBC: Cumbria ruled out of current nuclear waste dump plans

President George W. Bush approved Yucca Mountain as the site to store the U.S.'s spent fuel and high-level radioactive waste, but President Barack Obama cancelled work on the project in 2009.

CNN: Nuclear disasters: Is the fear realistic?

The Sellafield plant is the UK's largest and most hazardous nuclear site, storing enough high and intermediate level radioactive waste to fill 27 Olympic-sized swimming pools.

BBC: Sellafield inspection after 'intolerable risk' report

They contain another, much less radioactive waste called transuranic waste (TRU waste) that is thousands of times less radioactive than high-level waste.

FORBES: The First Amendment Bombs Nuclear Energy By Accident