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At issue is a 1977 rule that limits the total whole-body radiation dose to any member of the public from the normal operation of the uranium fuel cycle—fuel processing, reactors, storage, reprocessing or disposal—to 0.25 millisieverts per year. (This rule, known as 40 CFR part 190, is different from other EPA regulations that restrict radionuclides in drinking water and that limit public exposure during emergencies. Those are also due for revision.) "We have not made any decisions or determined any specifics on how to move forward with any of these issues. We do, however, believe the regulation uses outdated science, and we are thinking about how to bring the regulation more in line with current thinking," said Brian Littleton, a chemical engineer with EPA's Office of Radiation and Indoor Air."