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          About NRC  How We Regulate  RulemakingNRC Regulations by Subject Matter
        NRC regulations are found in Title 10, "Energy," of the *Code of Federal Regulations* (CFR), Chapter I, Parts 1–199 and are listed by part in the index to Title 10 of the CFR. You may also purchase NRC regulations from the Government Printing Office (GPO) Bookstore in a two-volume, paperback annual version.

The parts applicable to all licensees are 2, 19, 20, 21, 51, 71, 170, and 171. See the following Regulations, Guidance, and Communications pages for the parts applicable to specific types of licensees:

**Nuclear Reactors**

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