[The] operator, LLW Repository Ltd, said it had introduced new restrictions on the amounts of radioactivity that can be disposed of at the site in order to make sure that radiation doses to people will be "very small" if the wastes are exposed by coastal erosion. The company's head of science and engineering, Dr Richard Cummings, accepted that erosion could start "in a few hundred years." But he added: "The radioactivity in the wastes will largely have decayed away by this time."