The U.S. Nuclear Regulatory Commission (NRC or the Commission) is amending its regulations to improve decommissioning planning and thereby reduce the likelihood that any current operating facility will become a legacy site. The amended regulations require licensees to conduct their operations to minimize the introduction of residual radioactivity into the site, which includes the site's subsurface soil and groundwater. Licensees also may be required to perform site surveys to determine whether residual radioactivity is present in subsurface areas and to keep records of these surveys with records important for decommissioning. The amended regulations require licensees to report additional details in their decommissioning cost estimate (DCE), eliminate the escrow account and line of credit as approved financial assurance mechanisms, and modify other financial assurance requirements. The amended regulations require decommissioning power reactor licensees to report additional information on the costs of decommissioning and spent fuel management.