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The EPA issued the "Environmental Radiation Protection Standards for Nuclear Power Operations" in 1977. Since issuance of these standards, the understanding of radiation risk and dose to humans has advanced and new methodologies have been developed to calculate radiation doses. In view of the developments over the past decades, the EPA is evaluating how to update the Environmental Radiation Protection Standards for Nuclear Power Operations in 40 CFR part 190. An updated rule would draw on updated science and clarify how safety should be demonstrated. On February 4, 2014 (79 FR 6509), the EPA issued an advanced notice of proposed rulemaking (ANPRM) to solicit public input on general questions and approaches on what aspects of the rule should be updated.