The U.S. Nuclear Regulatory Commission (NRC) is discontinuing the rulemaking activities associated with potential changes to its radiation protection and reactor effluents regulations. The purpose of this action is to inform members of the public that these rulemaking activities are being discontinued and to provide a brief discussion of the NRC's decision to discontinue them. These rulemaking activities will no longer be reported in the NRC's portion of the Unified Agenda of Regulatory and Deregulatory Actions (the Unified Agenda).