Bloomberg: Prime Minister Gordon Brown will require companies that build nuclear power plants in the U.K. to take on liabilities for decommissioning those stations, when he sets out rules for the industry later this week. “Owners and operators would have to set aside funds to cover the full costs of decommissioning and their share of the long-term management and disposal costs of waste,” Brown’s spokesman, Michael Ellam, said today in a briefing. Decommissioning costs, which will top …